Bulletin of the Global Volcanism Network

All reports of volcanic activity published by the Smithsonian since 1968 are available through a monthly table of contents or by searching for a specific volcano. Until 1975, reports were issued for individual volcanoes as information became available; these have been organized by month for convenience. Later publications were done in a monthly newsletter format. Links go to the profile page for each volcano with the Bulletin tab open.

Information contained in these reports is preliminary at time of publication and subject to change.

 Bulletin of the Global Volcanism Network - Volume 39, Number 12 (December 2014)

Managing Editor: Richard Wunderman

Bagana (Papua New Guinea)

August 2014 to mid-April 2015, numerous ash plumes emitted

Chirinkotan (Russia)

Through April 2015, thermal anomalies & gas-steam plumes continue

Kilauea (United States)

27 June-30 December 2014: Birth and rapid advance of the June 27th lava flow


Papua New Guinea

6.137°S, 155.196°E; summit elev. 1855 m

All times are local

August 2014 to mid-April 2015, numerous ash plumes emitted

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Bagana is one of Melanesia's youngest and most active volcanoes; it is located on Bougainville Island, Papua New Guinea (figure 22). We begin this Bulletin report with a short summary of activity at Bagana from January 2013 through July 2014 (partly described in BGVN 39:06). We then focus on activity from August 2014-April 2015. The information included in this report primarily was found in material published by the Darwin Volcanic Ash Advisory Center (VAAC). Rabaul Volcano Observatory (RVO) reporting also appears in this report, particularly describing activity from August 2014. RVO reports are either sent directly to the Global Volcanism Program (GVP) or are included in Darwin VAAC Weekly Activity reports.

In this report we use local time for cases and observations reported by observers on the ground (two cases, on 10 and 12 August 2014). Otherwise, as is often the convention for satellite data, we use UTC. [Local time = UTC+11h.] The last Bulletin report (BGVN 39:06) discussed Bagana activity during 2011-2014.

Figure 22 below and figure 9 in BGVN 33:11 highlight the location of Bagana.

Figure 22. Image highlights the location of Bagana on Bougainville Island, Papua New Guinea. Bagana is located in a remote central portion of Bougainville Island. Papua New Guinea is located in SW Pacific, to the N and NE of Australia. Courtesy of the Darwin Volcanic Ash Advisory Center (VAAC).


January 2013-July 2014. During this interval, Bagana’s activity was mainly characterized by the emission of ash plumes. Based on information in Volcanic Ash Advisories (VAAs) published by the Darwin VAAC, in 2013 ash plumes from Bagana ranged from 1.8-4 km in altitude above sea level (a.s.l.) and drifted between 35 and 130 km. These plumes drifted towards the SW-N-E.

Through July 2014, ash plumes from Bagana ranged from 2.1-3 km in altitude a.s.l. and drifted 25-110 km according to the Darwin VAAC’s VAAs. Ash plumes again drifted to the SW-N-E, and also to the SSE.

August-December 2014. This section documents activity at Bagana from August to December 2014. Information on Bagana’s activity was scarce during October and December. From August through December, Bagana’s Aviation Color Code (ACC) was mainly Orange; however, as noted below, on 12 August 2014, Bagana’s ACC was upgraded to Red, the highest of the four colors in the Code. During this interval, ash plumes ranged from 2.1-7.6 km in altitude a.s.l. and drifted as much as 167 km. The plumes drifted to the SW-NE.

At the beginning of August 2014, variable amounts of thin to thick white vapor were seen being emitted from Bagana. During the second week of August, activity at Bagana increased. On 6 and 8 August, noises associated with rock falls were reported. According to the RVO, these rockfalls “may have been triggered by breakaway of large blocky lava from the front lobe of ongoing effusive lava flows which are [well known] for Bagana activity.”

According to a 10 August 2014 RVO report, around 0500 local time on 10 August 2014, an eruption began at Bagana that emitted an ash plume with a height estimated at several hundred meters above the crater. Personnel at the government station at Piva in Torokina (figure 21 in BGVN 39:06), reported that Bagana continued to emit variable thick dark ash clouds throughout the day. Ash clouds were blown to the SW and W, and possibly to the NW. In Wakovi, 6 km W of Bagana, ashfall was reported to have destroyed small tree branches, banana trees, and potato gardens. Ashfall was also reported in Laruma and at the Piva government station (figure 21 in BGVN 39:06). RVO further stated, “Conditions at Gotana, located about 9 km southwest from the volcano, are slightly better and people from Wakovi have been urged to move there if ashfall continues and conditions deteriorates.”

Whether any Wakovi residents did evacuate is uncertain.

From 2332 UTC on 10 August to 2132 UTC on 11 August, a volcanic ash plume was seen in satellite imagery (figure 23). The plume rose to an altitude of 3.1 km a.s.l. and eventually extended 167 km SW. On 12 August 2014, the Darwin VAAC observed ash clouds rising to an altitude of 7.6 km a.s.l., resulting in Bagana’s ACC to be increased to Red. The plumes eventually extended 167 km SW. In their VAAs from 12 August UTC, the Darwin VAAC remarked that an ongoing eruption (described as low-level in VAAs from 0700-~1000 UTC) was observed on satellite. In some of those VAAs, they also stated, “Ash from [the] initial explosive eruption [was] partially obscured by thunderstorm activity and [was] becoming detached from [the] volcano.”

According to a 13 August 2014 RVO report, at 1810 local time on 12 August, an earthquake was felt with an intensity of II on the Modified Mercalli Scale. The report stated that the earthquake was tectonic in origin. That RVO report also stated that areas in the W and SW were affected by ashfall. They described the level of exposure from ash as moderate in Wakovi and low around Kawai, Gotana and Piva government station (figure 21 in BGVN 39:06).

Figure 23. A MTSAT-2 Visible satellite image captured on 10 August at 23:32 UTC. Volcanic ash plume emitted from Bagana is enclosed in the white rectangle. This plume was observed to an altitude of 3.1 km a.s.l and eventually drifted 167 km SW. On the image, Bagana is represented by the yellow circle. Taken from 6-14 August 2014 Weekly Activity report compiled by the Darwin VAAC.

According to the 13-19 August 2014 Darwin VAAC Weekly Activity report, Bagana’s ACC was downgraded to Orange; the specific date when the downgrade occurred was not stated. Bagana’s ACC remained Orange through the end of the year. RVO reported that since 10 August, there were ash emissions, but Bagana’s level of activity had decreased.

From 25-28 August 2014, ash plumes, identified on satellite images, ranged from altitudes of 2.1-2.4 km a.s.l. and extended from 35-120 km, mainly to the W and WNW and some to the SW. From 19-31 August, RVO reported that Bagana’s activity was characterized by weak to moderate white vapor. They reported light gray ash plumes blowing SW on 19 and 27 August and a dull glow emanating from the summit on 19, 27, 29, and 31 August. Low roaring noises were also briefly heard on 27 August according to the RVO.

During September 2014, the Darwin VAAC reported a narrow ash plume on satellite imagery at 2132 UTC on 13 September. The plume was observed at an altitude of 2.4 km a.s.l and extended 139 km to the W. Then at 2332 UTC on 20 September, another ash plume was observed at 2.4 km a.s.l. This plume extended 56 km W. In the available Darwin VAAC Weekly Activity reports, only Bagana’s ACC was reported during the month of October.

In November 2014, an ash plume that extended 65 km S was observed at 2132 UTC on 8 November. In a VAA released at 0232 UTC on 9 November, the Darwin VAAC reported that ash from Bagana had dissipated in the satellite imagery. At the end of December 2014, Darwin VAAC reported an ash plume from Bagana on 29 December. The plume rose to an altitude of 2.4 km a.s.l. and extended ~95 km NE.

January through 14 April 2015. This section discusses Bagana activity from January to mid-April 2015. During this interval, Bagana’s ACC was reported as Orange by the Darwin VAAC. During much of February and March 2015, Bagana’s ACC was the only information reported in the available Darwin VAAC Weekly Activity reports. In this interval, ash plumes rose up to3.7 km in altitude a.s.l. and drifted to the N-NE-SE and to the SW.

At 2232 UTC on 20 January 2015, an ash plume was identified on satellite images. Darwin VAAC considered the plume to be low-level and it extended 37 km NE at an altitude of 3.7 km a.s.l. At 0032 UTC on 21 January, Darwin VAAC identified the ash plume again on satellite imagery. In that satellite image, the plume extended 22 km NE at an altitude of 3.7 km a.s.l. After that, the Darwin VAAC reported a meteorological cloud that covered the area. Later at 2232 UTC on 21 January, the plume was seen drifting 18 km SW at an altitude of 2.7 km a.s.l (figure 24).

Figure 24. An MTSAT-2 satellite image captured at 2232 UTC 21 January 2015. The volcanic ash plume in within the rectangle drifted 18 km SW at an altitude of 2.7 km a.s.l. Bagana is represented by the yellow circle. Taken from the 21-27 January 2015 issue of the Weekly Activity report compiled by the Darwin VAAC.

On 25 March 2015, an ash plume was identified on satellite imagery at 2132 UTC. The plume was observed at 2.1 km and drifted 37 km N-NE. At 2132 UTC on 26 March, another volcanic plume was observed at 3.1 km and extended 56 km NE. The Darwin VAAC reported observing a consistent plume until 0108 UTC on 30 March, when ash had dissipated. When the consistent plume was first observed was not stated in the 25-31 March 2015 Darwin VAAC Weekly Activity report. Darwin VAAC also reported a plume on satellite images at 2132 UTC on 31 March. The plume drifted 74 km SE at an altitude of 2.1 km a.s.l. The plume then shifted to the NE before a VAA at 0438 UTC on 2 April reported that the ash had dissipated. In the 8-14 April 2015 Weekly Activity report, the ACC remained at Orange.

Geologic Background. Bagana volcano, occupying a remote portion of central Bougainville Island, is one of Melanesia's youngest and most active volcanoes. This massive symmetrical, roughly 1850-m-high cone was largely constructed by an accumulation of viscous andesitic lava flows. The entire edifice could have been constructed in about 300 years at its present rate of lava production. Eruptive activity is frequent and characterized by non-explosive effusion of viscous lava that maintains a small lava dome in the summit crater, although explosive activity occasionally producing pyroclastic flows also occurs. Lava flows form dramatic, freshly preserved tongue-shaped lobes up to 50-m-thick with prominent levees that descend the volcano's flanks on all sides. Satellite thermal measurements indicate a continuous eruption from before February 2000 through at least late August 2014.

Information Contacts: Darwin Volcanic Ash Advisory Centre (VAAC), Bureau of Meteorology, Northern Territory Regional Office, PO Box 40050, Casuarina, NT 0811, Australia (URL: ftp://ftp.bom.gov.au/anon/gen/vaac/); and Rabaul Volcano Observatory, Department of Mineral Policy and Geohazards Management, Volcanological Observatory Geohazards Management Division, P.O. Box 386, Kokopo, East New Britain Province, Papua New Guinea.



48.98°N, 153.48°E; summit elev. 724 m

All times are local

Through April 2015, thermal anomalies & gas-steam plumes continue

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[What follows is the latest corrected report (put online in late May 2015) taking advantage of new information.]

Korovin is a stratovolcano located on Atka Island in the central Aleutian Islands (figure 1 in BGVN 23:06 and figure 2 in BGVN 31:11). Korovin’s most recent reported activity ended in 2007. This Bulletin report summarizes and contains new information on activity at Korovin from 1998 to 2007 by drawing on information primarily from the Alaska Volcano Observatory (AVO) and their cited publications. Much of the summary takes the form of a table at the end of the report.

Previous Bulletin reports, which were listed under Atka on our website, address past activity at Korovin. These reports are now listed under Korovin on our website. This occurred because Simkin and Siebert (1994) listed all volcanoes on the northern part of Atka Island, including Korovin, under Atka. Later, Siebert and others (2009) listed Korovin as a separate volcano distinct from Atka. Eruptions in 2005 and early 2006 are discussed in BGVN 31:02 and eruptions in late 2006 in BGVN 31:11.

In this Bulletin report, we start by providing background information on the Atka volcanic complex within which Korovin is located, as well as information on Korovin.

xxxAtka volcanic complex. According to Myers and others (2002) Korovin is a part of the 360 km2 Atka volcanic complex, found on the northern part of Atka Island. It is the largest modern complex within the central Aleutians (Myers and others, 2002). The ancestral Atka volcano, in the complex, was described as a large shield volcano consisting of basaltic and basaltic andesite flows, which was subsequently surrounded by a series of satellite vents (Myers and others, 2002).

A caldera forming eruption at the Atka shield volcano occurred ~300,000-500,000 years ago, creating a 5 km diameter caldera. Associated with that event was the eruption of a large dacitic flow, called Big Pink. Regarding the composition of Big Pink, Myers and others (2002) said, “It consists of pumiceous and glassy units but is not associated with any ash flows.” After the caldera formation, the volcanic centers of Korovin, Kliuchef, Konia and Sarichef formed. ::: Figure 4 is a topographic map showing the location of these four volcanic centers and the location of the Atka caldera. These structures all comprise the Atka volcanic complex.

Korovin volcano. Korovin is located 21 km NE from the town of Atka (::: figure 4). Korovin is the largest and tallest volcano of the post-caldera volcanic centers within the Atka volcanic complex. According to Myers and others (2002), Korovin shows little evidence of glaciation, unlike Kliuchef, located ~5 km S of Korovin. Regarding Korovin’ edifice and age, Myers and others (2002) say “Its uneroded form suggests the volcano is mostly Holocene in age.”

Korovin has a basal diameter of ~7 km and two summit vents located 0.6 km apart (Myers and others, 2002). The NW summit vent has a small crater and is the lower of the two vents. The SE summit has a 1 km wide crater, with steep walls and a depth of several hundred meters (Myers and others, 2002). The SE summit crater sometimes contains a crater lake and is considered Korovin’s active crater. ::: figure 5 is an aerial photo of Korovin, highlighting its two summit vents.

Figure 5. Photograph of Korovin volcano taken from an aircraft flying at 9.1 km altitude on 5 August 2007. The view is oblique and from the N (i.e. looking S). Steam is rising from the active crater (SE crater). The summit of Kliuchef volcano is partially visible at the top of the image; it sits ~5 km S of Korovin. Photograph taken by Burke Mees, Alaska Airlines. Photograph from McGimsey and others (2011).

During the summer of 2004, AVO installed a network of seismic stations throughout the northern part of Atka Island. Data from the network was accessible in March 2005; however, it wasn’t until December 2005 that Korovin was considered seismically monitored. On 2 December 2005, Korovin was also officially assigned the Level of Concern Color Code Green after “a sufficient period of background seismicity had been recorded” (McGimsey and others, 2007). Before, AVO had listed Korovin as UA (unassigned) during periods when no significant activity was noted. AVO assigns volcanoes UA when there is no real-time seismic network in the area that can be used to define background levels of seismicity.

In addition to being seismically monitored, Korovin is also monitored through ground-based, aerial, and satellite imagery and photographs. Korovin and its plumes are often photographed by residents of Atka village (::: figures 6 and 7), which are then sent to the AVO. ::: Figure 8 provides examples of photos of Korovin taken from satellites. Images from ::: figures 6-8 furnish various kinds of evidence, from steaming (i.e. non-eruptive cases, ::: figure 7), ash-bearing plumes (::: figure 6), and the result of ash-bearing eruptions (ash on the snow surface seen in satellite views, ::: figure 8). Evidence of these kinds is summarized in next section.

Figure 6. Photographs showing the progression of a steam plume that developed over Kovorin around 1900 on 23 February 2005. Plume was observed drifting to the E, and ash was seen falling out near the base of the plume. These photos were taken in Atka village and are courtesy of Louis and Kathleen Nevzoroff. Photos were taken from McGimsey and others (2008). Figure 7. Photograph of a steam column rising from Korovin on 27 July 2007. Steam was estimated to reach ~215-245 m above the crater. The photo was captured by Louis Nevzoroff from Atka village. Taken from McGimsey and others (2011). Figure 8. Two satellite photographs showing ash deposits on the upper E flank of Korovin in 2002 (top) and 2004 (bottom). The source of these ash deposits is thought to be intermittent, minor phreatic eruptions through the hot, roiling lake within the SE summit crater of Korovin (McGimsey and others, 2007). Top image was taken on 5 July 2002 and produced by the Image Analysis Laboratory, NASA Johnson Space Center. Bottom image was captured on 4 July 2004 and is an Ikonos near-infrared color composite, copyrighted by Space Imaging LLC. Both images originally published in McGimsey and others (2008).

Defining the term ‘eruption.’ There is no universally agreed-upon definition for the term ‘eruption’. McGimsey and others (2011) however, follow the GVP’s eruption definition where an eruption is an event involving explosive ejections of old or new fragmental material, the effusion of liquid lava, or both. Volcanically produced heat and near-surface water can interact explosively causing a dramatic eruption, which may or may not bring fresh volcanic material to the surface.

McGimsey and others (2011) go onto say, “The element of this definition we wish to emphasize are the verbs ‘eject’ and ‘effuse’ which refer to dynamic surface processes that pose some level of hazard. The presence or absence of often ambiguous ‘juvenile material’ or fresh magma is not relevant to this use of the term eruption, particularly when communicating a potential hazard that makes no distinction between juvenile and non-juvenile eruption products. This definition would not, however, include passive volcanic degassing or hydrothermal-fluid discharge unless accidental solid fragments are entrained.”

1998-2007 activity at Korovin. In this section of the Bulletin report, we summarize the volcanic activity at Korovin that took place between 1998 and 2007 (table 1). During this interval, activity ranged from eruptive cases to those that were considered non eruptive.

Activity was often reported to AVO by Atka village residents and pilots in the area. Korovin was also monitored through satellite imagery, when weather conditions were favorable. During this interval, the highest plumes were observed on 30 June 1998 and reached an altitude of ~9.1 km. As activity varied at Korovin, the Aviation Color Code (ACC), the Volcanic Activity Alert Level (VAAL), and the Level of Concern Color Code (LCCC) were changed to reflect Korovin’s activity status.

On their website, AVO presented general information on Korovin’s reported activity from 1998-2007. For each of the events within this interval, AVO cited information from several sources, some of which included the following: McGimsey and others (2003), which discussed activity in 1998; McGimsey and others (2008), which discussed 2005 activity; Neal and others (2009) that looked at 2006 activity; and McGimsey and others (2011) that detailed 2007 activity. AVO also referenced several past Bulletin reports, which highlighted Korovin activity (BGVN 23:06, and 31:02).

Our summary in table 1 summarizes the following: (1) the basic information on Korovin’s activity from the AVO website and (2) additional information from some of AVO’s cited references. Greater detail can be found on AVO’s website and in their cited references.

Table 1 contains two columns, entitled Date and Remarks. The Date column refers to the year of Korovin activity. The Remarks column generally contains the following: (1) “AVO:” This presents a very brief synopsis of the summary that AVO provides on each of their Korovin reported activity web pages (as accessed in May 2015). (2) Below that, we present a succinct timeline of Korovin activity created using on information found in some of AVO’s cited references.

In table 1, please note we have separated 2005 activity into two rows, to highlight two different periods of activity during that year. Also note that 2006-2007 is considered one period of activity and is therefore detailed in one section (i.e., one row).

Table 1. Table that condenses key events at Korovin during both eruptive and non-eruptive periods during 1987-2007. The data sources are stated in the table. Where AVO cited references are augmented by past Bulletin reports, the information has been [bracketed]. Times are all local, unless otherwise stated. The term ‘resident(s)’ refers to resident(s) of Atka village. Abbreviations used are as follows: Village Public Safety Officer, VPSO; above sea level, a.s.l., and Interferometric synthetic aperture radar, InSAR; Aviation Color Code, ACC; Volcanic Activity Alert Level, VAAL; Level of Concern Color Code, LCCC; unassigned activity (UA); and satellite-based Ozone Monitoring Instrument, OMI.

Date Remarks


Eruption started, 30 June 1998 ±1 month. Eruption end, 30 June 1998 ± 7 days


McGimsey and others (2003):

Eruption start / stop dates: 30 June / 8 July

“…, the timing of this activity remains poorly constrained; intermittent ash may, in fact, have occurred weeks or prior to June 30.”

10 May- Pilot observed ash on SE slope. Pilot had seen no ash the previous week and speculated the ash was deposited a few days prior to May 10

28 June-Individual reported a dark ash plume over Korovin

30 June-VPSO in Atka village reported two separate clouds, first at ~0730 and second at ~0830. Second cloud rose ~9.1 km and was tinted orange. VPSO said events “produced dustings of ash in Atka”. AVO received 2 pilot reports: (1) at 1115, noted volcanic cloud reached ~4.9 km a.s.l., (2) at 1720, cloud to 9.1 km near Korovin

2 July- Resident reported a ‘rusty’ cloud, ~4.9 km a.s.l. moving SE

3 July- Pilot reported profuse steam from summit crater and ash on S, SE and E flanks. Thin trail of ash extended SW towards Atka village

8 July- AVO noted minor, weakly ash-bearing clouds over Korovin with satellite images

2002 AVO:

Eruption started, July 2002 ±1 month. Considered a questionable eruption


McGimsey and others (2008):

5 July- Satellite photo of ash deposits on upper E flank of Korovin (::: figure 8 top). “Intermittent, minor phreatic eruptions through a hot, roiling lake in the south summit crater of Korovin [is] the probable source.”

2004 AVO:

Eruption started, June 2004 ±1 month. Considered a questionable eruption


McGimsey and others (2008):

4 July- Satellite photograph shows ash deposits on upper E flank of Korovin (::: figure 8 bottoms). Same explanation as 5 July 2002


Neal and others (2009):

7 July- Korovin photographed with ash covering the snow on its E flank. According to the caption of the photograph, “The deposit may be the result of phreatic explosions or vigorous wind remobilization of ash from within the summit crater.”


19 July- Aerial photograph of Korovin showing ash deposited around the crater vent. The caption for the photograph states, “At times, a shallow body of gray, turbid water partially fills the inner crater and, in 2004, was observed roiling. Phreatic explosions from this water-rich, high-temperature system may be responsible for the occasional localized ash-fall deposits seen on the upper flanks of Korovin.”

2005 AVO:

Eruption started, 23 February. Eruption end, 7 May ± 14 days. Considered a questionable eruption.


McGimsey and others (2008):

23 February- Clear day. Residents noted minor steaming around 1200. Around 1900, residents observed dark cloud rising several thousand feet and drifting E (::: figure 6). Ash seen falling out near base of plume. Minutes later, three or four smaller gray puffs seen. No other activity seen that night. In satellite imagery, small steam plume with minor ash noticed. Height of plume estimated at ~3 km (10, 000 ft)

24 February- LCCC was raised from UA (unassigned) to Yellow

4 March- LCCC reduced from Yellow to UA

19 March- Pilot report noted steam rising several thousand feet above Korovin

Early May- Observational data showed roiling lake in SE crater emptied. Visible glow.

2005 AVO:

Seismicity without confirmed eruption, start / end: 13 September


McGimsey and others (2008):

13 September- Long sequence of strong seismicity. Sequence began with two small local events, then ~30 minutes of weak tremor, and then ~20 weak local events. Nothing unusual noted in satellite images from this time.

2006-2007 AVO:

Non-eruptive activity started, 16 January 2006 and ended September 2007 ± 2 months.


Neal and others (2009):

16 January 2006- Background seismic activity increased

17-18, 21 Jan and 21-22 Feb- burst of tremor-like signals

22 February 2006- LCCC increased from Green to Yellow

Early March- Seismicity stabilized and then decreased

8 March- LCCC downgraded from Yellow to Green

July- Increased number of earthquakes in vicinity of Korovin

September and October- Increased tremor episodes

19 October- SE crater lake disappeared by this date and absent for rest of 2006. Lake present on 12 September (satellite data).

29 October- White vapor plumes rose several hundred meters above Korovin and coincided with ~5-min of strong tremor

5 November 2006- Strongest earthquake swarm recorded by seismic network

6 November- Yellow ACC and an Advisory VAAL declared

18 November- dark-gray ash on E flank of SE crater observed in ASTER satellite images. Ash was not present in image from 21 November. ASTER satellite imagery showed warm spots in Korovin crater

Late November 2006- Significant deformation in latter half of 2006. Circular pattern of uplift, as much as 5 cm noted through July and October InSAR data. November-December- Seismicity high; strong, short-lived signals. Low-frequency tremor bursts.

11, 21 and 24 December 2006- Residents photographed large, white-vapor plumes rising from Korovin. One resident noted that he saw ash falling below the plume he reported. Ash was not verified on the ground

End of 2006-No ash detected in atmosphere or on ground through satellite data. Rise in ground temperature also not detected

McGimsey and others (2011):

Beginning of 2007- ACC, Yellow, and VAAL, Advisory due to increased activity in 2006. High seismicity from 2006 continued into 2007. Inflation (uplift) in N part of Atka Island that began in June 2006 totaled 9-10 cm and began to taper off in 2007

11 January 2007- M3.5 earthquake considered large for volcano-generated seismicity.

23 January- Series of tremor bursts

24 January- Resident took pictures of steam column rising from SE crater and reported similar steam columns rose ~300 m every 15-80 minutes

14 February 2007- Pilot reported a steam plume extending 1.5-2.4 km over Korovin

3 March- Residents photograph ash deposit on W flank. Residents observed steam from SE summit vent. Flurry of low-frequency seismicity in morning

May, June & August- Episodes of tremor lasted several days

27 July 2007- Steam plumes observed by residents (::: figure 7)

5 August- OMI detected small SO2 cloud, 300 km N of Cleveland volcano. Based on wind dispersal models, cloud believed to be from Korovin. Aerial photo (::: figure 5) showed steam rising from SE crater

20 August- OMI detected small emission of SO2 from Korovin

7 September- ACC/VAAL downgraded to Green/Normal due to decreasing trends in seismicity and uplift

October-December 2007- uneventful

References. Alaska Volcano Observatory (AVO), 2014, Korovin Volcano description and information, accessed on 14 April 2015, (URL: http://www.avo.alaska.edu/volcanoes/volcinfo.php?volcname=Korovin)

Alaska Volcano Observatory (AVO), 2014, Korovin reported activity, accessed on 14 April 2015, (URL: http://www.avo.alaska.edu/volcanoes/volcact.php?volcname=Korovin)

Alaska Volcano Observatory, the U.S. Geological Survey, BigTopo 7, and AllTopo 7, Topographic shaded relief image of the northern part of Atka Island (Image 2906), accessed on 14 April 2005, (URL: http://www.avo.alaska.edu/images/image.php?id=2906)

McGimsey, R. G., Neal, C. A., and Girina, O., 2003, 1998 volcanic activity in Alaska and Kamchatka: Summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Open-File Report OF 03-0423, 35 pp, (URL: http://pubs.usgs.gov/of/2003/of03-423/)

McGimsey, R.G., Neal, C.A., Dixon, J.P., and Ushakov, S., 2008, 2005 Volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Scientific Investigations Report 2007-5269, 94 pp, (URL: http://pubs.usgs.gov/sir/2007/5269/)

McGimsey, R.G., Neal, C.A., Dixon, J.P., Malik, N., and Chibisova, M., 2011, 2007 Volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Scientific Investigations Report 2010-5242, 110 pp, (URL: http://pubs.usgs.gov/sir/2010/5242/)

Myers, J.D., Marsh, B. D., Frost, C. D. and Linton, J.A., 2002, Petrologic constraints on the spatial distribution of crustal magma chambers, Atka Volcanic Center, central Aleutian arc, Contributions to Mineralogy and Petrology, vol. 143, issue 5, pp. 567-586, DOI 10.1007/s00410-002-0356-7 (URL: http://link.springer.com/article/10.1007/s00410-002-0356-7)

Neal, C.A., McGimsey, R.G., Dixon, J.P., Manevich, A., and Rybin, A., 2009, 2006 Volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Scientific Investigations Report 2008-5214, 102 pp, (URL: http://pubs.usgs.gov/sir/2008/5214/ )

Simkin, T., and Siebert, L., 1994, Volcanoes of the World (2nd edition), Geoscience Press, 349 pp.

Siebert, L., Simkin, T., & Kimberly, P., 2010, Volcanoes of the World (3rd edition), University of California Press, 551 pp.

Geologic Background. The small, mostly unvegetated 3-km-wide island of Chirinkotan occupies the far end of an E-W-trending volcanic chain that extends nearly 50 km west of the central part of the main Kuril Islands arc. Chirinkotan is the emergent summit of a volcano that rises 3000 m from the floor of the Kuril Basin. A small 1-km-wide caldera about 300-400 m deep is open to the SE. Lava flows from a cone within the breached crater reached the north shore of the island. Historical eruptions have been recorded at Chirinkotan since the 18th century. Fresh lava flows also descended the SE flank of Chirinkotan during an eruption in the 1880s that was observed by the English fur trader Captain Snow.

Information Contacts: Sakhalin Volcanic Eruptions Response Team (SVERT), Institute of Marine Geology and Geophysics (IMG&G) Far East Division Russian Academy of Sciences (FED RAS), 1B Science St., Yuzhno-Sakhalinsk, 693022, Russia (Email: rybin@imgg.ru, URL: http://www.imgg.ru/).


United States

19.421°N, 155.287°W; summit elev. 1222 m

All times are local

27 June-30 December 2014: Birth and rapid advance of the June 27th lava flow

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Introduction. This report, taken largely from Hawaiian Volcano Observatory (HVO) reports and online photo galleries, nominally covers 27 June to 30 December 2014 but adds a few details from earlier and later intervals. The lava flow just before this interval, called the Kahauale'a 2 flow, had started in May 2013 (BGVN 39:05). That flow had, during April-June 2014, advanced erratically (BGVN 39:09) and HVO Daily Updates declared it inactive (“cutoff and dead”) by 30 June.

Prior to that, on 27 June, a new flow had emerged adjacent to the Kahauale'a 2 flow; it became informally named the June 27th breakout and then the June 27th lava flow. The June 27th lava flow made it to the outskirts of Pahoa, stopping at the end of 2014 with two lobes as close as about 0.7-0.8 km W of the major arterial road that passes through the town (HI-130).

The 27 June to 30 December 2014 interval was characterized by unusual developments shown here chiefly by a series of maps. The June 27th lava flow did not follow the usual pattern of flow from the summit or E rift zone to the sea. Rather, this June 27th lava flow, like the Kahauale?a 2 flow, generally progressed E to NE.

The HVO reporting during this reporting interval included a number of commonly seen processes in the over 3-decade-long eruption, which we largely omit here for brevity. We presented a summary of many of those processes in the introduction to our previous report (BGVN 39:09). They include, for example, glow, spatter, minor ash, pelee’s hair, and similar emissions at either the summit vent’s lava lake or along the E rift zone at Pu'u O'o crater. We have done little to track the details of breakouts on a daily or hourly basis, particularly in the near-vent area. It is also worth noting that monitoring was disrupted by Hurricane Iselle on and around 7 August 2014.

Subsections below are as follows: “Events at Pu'u O'o and Halema'ama'u”; “June 27th lava flow advance towards Pahoa”; “Graphical approaches to hazards and scientific communication”; “Lava lake heights in Overlook crater”; “Geophysical monitoring”; and “SO2 flux data.” For readers seeking a deeper understanding a recent book delves into the characteristics of Hawaiian volcanoes (Poland and others, 2014).

Events at Pu'u O'o and Halema'ama'u. On 27 June the new breakout on the NE flank of Pu'u O'o erupted through fissures. HVO’s online reporting in their Photo and Video section stated that the breakout reached 1.5 km long by 1100 local time. Several fissures on the upper NE flank of Pu'u O'o cone sent out flows to the NE, HVO noted. These flows partially overlapped with the existing Kahauale?a 2 flow, which had scattered surface flows that morning. Breakouts caused minor subsidence in the Pu'u O'o crater floor. This led to collapses of several spatter cones on the crater floor. Small lava ponds were revealed and the NE lava pond enlarged due to the collapse. HVO reporting at the time (27 June) described the Kahauale?a 2 flow as still active.

By 30 June HVO declared the Kahauale?a 2 flow inactive. The lava tube feeding the Kahauale?a 2 lost hydraulic connection to the NE lava pond when the level of that lake dropped. The entry to the tube could be seen stranded meters above the lava in the vent wall (figure 231).

Figure 231. View of the wall (roughly 10 m high) above the lava pond in the NE portion of Pu'u O'o crater. The lava pond surface is in the lower portion of the photograph. The dark hole in the upper part of the photograph is the entrance to the ~2-m diameter lava tube that had been supplying lava to the Kahauale?a 2 flow. When the lava level dipped well below the entrance to the lava tube, lava ceased entering the tube, leaving the Kahauale?a 2 flow inactive. Look direction unstated. Courtesy of HVO.

More details follow on the June 27th flow’s early phases, as reported in the 27 June 2014 Daily Update. “Seismic tremor levels were low with a few dropouts (periods when spattering is absent in the lava lake and gas emissions are relatively low). Sixteen earthquakes were strong enough to be located beneath Kilauea Volcano in the past 24 hours: 1 [centered on a fault system passing NNW of Kilauea’s summit] in the Ka’oiki Pali area, 1 beneath Halema`uma`u Crater, 4 beneath the area south of Halema`uma`u Crater, 6 on south flank faults, 3 within the upper East Rift Zone, and one within the middle East Rift Zone. GPS receivers spanning the summit caldera recorded almost +4 cm of extension since May 24; the long-term, cross-caldera measurements indicate continued extension at a rate averaging 10 cm/yr (4 in/yr) since March, 2010.

“Recent Observations at the middle East Rift Zone vents: The tiltmeter at Pu'u O'o cone recorded an abrupt drop, that is slowing, of more than 7 microradians. The lava flow from the northeast spatter cone continued to be active until midnight; early this morning, coincident with the rapid deflation, the crater floor started to slowly subside and new lava was erupted on the north flank of Pu'u O'o cone; in addition, the upper part of the south cone collapsed around 7 am. GPS receivers recorded 5 cm of contraction across the cone following this morning's deflation.”

“Recent Observations of the Kahauale'a 2 flow: PNcam views yesterday showed active breakouts at the north base of Pu'u O'o cone and distant broad smoke plumes, with multiple glowing points visible at night from both near and distant breakouts. A satellite image from June 20 showed multiple active breakouts in the interior of the Kahauale'a 2 flow extending 7.1 km (4.4 mi) northeast from the Pu'u O'o vent (see map for June 17 flow details).

“In general, this slow-moving [Kahauale'a 2 ] lava flow has made erratic progress over the past few months and appears to be slowly weakening. Disruption of the flow front has occurred during strong DI deflation events when the lava supply abruptly decreased causing the flow front to stagnate. DI inflation and resumption of lava supply usually follow a few days later. Breakouts reappear well behind the stalled flow front and take some time to reach the front again. In this way, the flow front has not advanced more than 1.8 km (1.1 mi) since the first time it stalled in early November, 2013.”

The 27 June breakout formed a lava shield high on the Pu'u O'o cone during 28-29 June. A set of HVO photos taken on 26 June and 6 July documented before and after shots of a broad prominent shield. Associated text said the shield made a “dramatic change to the skyline” at Pu'u O'o. The text attributed the growth to the process of successive flows stacked on top of each other in the near vent area. The caption also said that the shield hosted a lava pond.

Photos of Pu'u O'o taken on 18 July addressed a new crater at Pu'u O'o. Since the onset of the "June 27 breakout" flow, the central part of Pu'u O'o's crater had slowly collapsed within a bounding ring fracture. One photo showed the pit formed on the southern side of the crater floor, which contained a small lava pond roughly 10 m across. This pit sporadically overflowed sending lava toward the deeper central part of the crater.

During 16-22 July the lava flow followed an incipient lava tube from the vent to the gentle break in slope at the base of Pu'u O'o, and continued slowly moving in two main lobes that extended about 2 km NE. Two small lava ponds within cones were present within two southeastern pits in the crater floor, and glow above two other pits indicated lava near the surface.

On 23 July the SE wall of Overlook crater fell into the lava lake and triggered an explosive event that threw spatter bombs onto the rim of Halema'ama'u. Ejected material ranged from dust-sized particles to spatter bombs ~70 cm across. The HVO Photos and Video portion of their website featured some dramatic web camera videos of the event. This process repeated again in this middle to late2014 time frame with cases noted on 6 and 23 August, and on 24 September.

A photo of the Pu'u O'o vent area on 26 September appears in figure 232.

Figure 232. Annotated photo taken 26 September 2014 showing Pu'u O'o and the vent and upper lava tube (orange dashed line at far right) for the June 27th lava flow. View is towards the E. Courtesy of HVO.

At 0115 on 19 October another explosion of spatter took place at the lava lake at Halema'ama'u from the lava lake in crater. . A collapse of wall rock fell into the lake, triggering a small explosion. The scar left by this collapse was visible as a light-colored area. The spatter fell around Halema'ama'u crater, which is within an area closed to the public due to hazards like this.

The summit lava lake has shown the usual fluctuations associated with changes in spattering behavior, which are also manifested as variations in tremor amplitudes and gas release. Small amounts of particulate material were carried aloft by the plume.

June 27th lava flow advance towards Pahoa. During the rest of this report, the advancing flow of note was the June 27th lava flow. As noted above, that flow ceased to advance rapidly but remained active near the distal end through the rest of 2014 (and months into 2015). That point is critical because the distal end began to encroach on the W margin of the town of Pahoa.

We present a series of HVO maps in this section, starting with one created to describe the June 27th lava flow (figure 233).

Figure 233. A map describing lava flows on 27 June 2014. Map showing the Kahauale?a 2 flow (pink) in relation to the E part of the Island of Hawai?i as of 17 June 2014. The most distant active breakout for Kahauale?a 2 lava flow was 7.1 km straight-line distance NE of Pu'u O'o. A new breakout of 27 June (shown in red) started on the NE flank of Pu'u O'o, sending new lava NE. Lava flows emitted since 1983 are labeled on the next figure. The Kahauale?a 2 flow contained an approximately located lava tube, shown with a yellow line (dashed where its position is less well known). Courtesy of HVO.

All of the following maps have several features in common. The yellow line depicts the approximate location of the feeding lava tube (dashed where less certain). When time is referred to, the times are in local (Hawaii Standard) time. Some of the maps contain more details than others on background information such as the age ranges of lava flows going back to the start of this eruption (1983). Figure 234 and its caption explain the color scheme, although some later maps generalize all the older lava flows as one color. A critical detail on figure 234 is that by 30 June, the Kahauale?a 2 lava flow had been declared inactive.

Figure 234. A map describing Kilauea E rift zone and the start of the June 27th lava flow (“breakout”) on 30 June 2014. The area of the new flow as mapped on 27 June appears pink, while the extending portion mapped 30 June appears red. The 2013–2014 Kahauale?a 2 flow appears reddish orange. Older lava flows distinguished by color as labeled ( episode 1–48b flows (1983–1986) are shown in gray; episodes 48c–49 flows (1986–1992), yellow; episodes 50–55 flows (1992–2007), tan; episodes 58–60 flows (2007–2011), pale orange, and episode 61 flows (2011–2013), very light tan). Courtesy of HVO.

Figures 235 to 237 portray the June 27th lava flow advance from 29 July to 6 September. HVO attributed the surprisingly narrow character of the flow as likely related to the numerous linear cracks and down-dropped structures (grabens) found in this area. In this regard, HVO noted that lava within a linear crack remained hidden for several days but over the day of 25 August lava returned to the surface at a point slightly farther along the crack. The emerging lava created a small island surrounded by thick forest. The farthest tip of the flow that day reached 11.4 km from Pu'u O'o, and 3.1 km from the eastern boundary of the Wao Kele o Puna forest reserve. On 28 August plumes of smoke from burning vegetation marked the farthest active lava on the surface (small, scattered lobes of pahoehoe). In addition, a pad of lava had emerged from the long ground crack that funneled it NE earlier this week. The lava was inactive at its surface but thermal imagery indicated it was still quite warm. East of this pad of lava, steaming appeared on 28 August, suggesting continuing lava advance below the surface along a ground crack. Direct views into the crack were not possible due to thick vegetation, but close views of the steaming areas with a thermal camera revealed temperatures up to 190°C, temperatures interpreted by HVO as evidence of lava moving along a crack. That was confirmed on the 29th when lava again emerged out of a steaming crack. On 1 September lava plunged into another ground crack. On 10 September, the most distal flow front had reached 14.5 km (straight-line distance) from its vent at Pu'u O'o.

Figure 235. A map describing Kilauea’s June 27th lava flow on 29 July 2014. The pink area represents lava emplaced by 18 July. The red area represents lava emplaced after that and as late as 29 July. By this time the new flow had advanced while remaining much narrower than the adjacent Kahauale?a 2 flow. The new flow (pink and red zones) had a straight-line length of ~4.4 km. Courtesy of HVO.
Figure 236. A map describing Kilauea’s June 27 lava flow on 3 September 2014. The area of the flow as mapped on September 1 is shown in pink, while widening and advancement of the flow as of September 3 is shown in red. On 2 September, lava welled up out of the crack it was filling and spilled out onto the ground to feed new surface flows. As of early afternoon on 3 September, lava on the surface was 13.2 km from the vent and 1.3 km from the E boundary of the Wao Kele o Puna Forest Reserve. All older lava flows (1983–2014) are shown in gray; the yellow line marks the lava tube. Courtesy of HVO.
Figure 237. A map describing the state of Kilauea’s June 27th lava flow on 6 September 2014. The larger scale expands the area of coverage to see both the distal part of the lava flow and its relation to nearby Puna communities. This map also depicts the distal ends of the flow at various dates in time. The area of the flow on 3 September is shown in pink, while widening and advancement of the flow as mapped at ~1110 on 6 September is shown in red. The black dots mark the flow front on specific dates. The blue lines show the modeled steepest down-slope paths (see text). The narrowness of the flow was attributed to areas of linear down-dropped zones (grabens) and cracks along the E rift zone. Courtesy of HVO.

Kauahikaua (2007) discussed the use of an appropriate digital elevation model (DEM) to calculate the steepest path of descent along the East rift zone (blue lines in figure 237 and subsequent figures). The basis of that report was a 1983 digital elevation model (DEM). For the case at hand, Bulletin editors are uncertain about the exact dataset used to make the model. Whatever their source, the blue lines on the subsequent maps (below) can be used to infer the approximate directions of the flow’s potential advance. These models are imperfect since, for example, the maps have only a finite resolution, and they may lack the updated distribution of lava flows, which themselves change the topography. Kauahikaua (2007) points out that seemingly subtle differences between actual topography and the model may lead to divergence from the modeled lines of steepest descent.

In early September the flow changed its direction of advance. The flow, initially headed almost N along one of the modeled paths of greatest descent (blue lines). By 10 September the direction of advance curved, shifting again more to the E (figure 238). On 3 September, HVO raised the Volcano Alert Level from Watch to Warning, where they both remained during the rest of 2014.

Figure 238. A map describing the state of Kilauea’s lava flow on 10 September 2014, but also emphasizing points of farthest advance through August and early September. The distal end of the pink region shows the state of advance as late as 1245 on 8 September 2015. The red region shows advance from that time until about 1445 on 10 September. Blue lines show modeled steepest paths of descent (see text). Courtesy of HVO.

On 15 September, HVO noted that the flow entered a subdivision called the Kaohe Homesteads (figure 239). They said that at this stage the flow was still within the vacant, forested NW portion of subdivision.

Figure 239. A map describing the state of advance for Kilauea’s lava flows on 15 September 2014. The area of the flow as of 12 September at 1230 appears in pink. The area of flow advance after that, and as late as 15 September at 1400, appears in red. The active flow reached 15.5 km from the vent and had crossed the Wao Kele o Puna Forest Reserve boundary progressing into the vacant NW corner of Kaohe Homesteads. At this stage, HVO noted, the flow front was situated 4.3 km upslope from Pahoa Village road. HVO also reported the flow length as measured along the curving path of the lava-tube (yellow line) as 17.7 km. The purple arrow shows HVO’s short-term projection of flow direction based on topography and recent flow behavior. Blue lines depict the modeled steepest lines of descent (see text). Courtesy of HVO.

By 19 September the flow still progressed NE through Kaohe Homesteads, HVO noted. For the previous several weeks, the flow had been moving through thick forest but around this time the flow front reached the forest boundary (figure 240) and more open ground.

Figure 240. A map (with key) describing the state of Kilauea’s lavas on 6 October 2014. Note the Forest Reserve and its boundary (a thin line crossing the flow a few hundred meters E of the 12 September flow front). HVO noted that vegetation density dropped after crossing that boundary. Blue lines depict the modeled steepest lines of descent (see text). Courtesy of HVO.

The flow advanced at an increased rate during 22-23 October, and at 1400 on 24 October the flow front pushed ahead as a narrow lobe reaching ~19 km from the Pu'u O'o vent. The front was 135 m from Cemetery Rd./Apa?a Street, two roads on the W outskirts of town. On 26 October the flow’s leading tip advanced through Pahoa cemetery.

During 22-28 October HVO reported that the lava flow remained active. On 22 October a narrow lava flow (less than 50 m wide) that had overtaken the flow front during the previous few days moved into a small gully. It sometimes moved as fast as 300 m/day (many times faster than the typical). Another breakout upslope continued to advance at a slower rate. On 24 October, HVO scientists aboard an overflight measured the cross-sectional area of the lava tube feeding the flow at the vent. Their measurement suggested a slight increase in the lava supplied to the flow.

At approximately 0350 on 25 October lava crossed Apa’a Street and continued to advance towards the town of Pahoa. Throughout the morning the flow moved down the Pahoa cemetery driveway and then turned SE into adjoining pasture. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning. At 0900 on 26 October the flow was an estimated 140 m wide. The next day it had narrowed to 100 m wide and was about 570 m from Pahoa Village Road. At about 0200 on 28 October the flow had reached the first occupied residential property. The leading edge of the flow was less than 50 m wide but increased to 150 m upslope. At 1730 the lava flow was 310 m in a straight-line distance from Pahoa Village Road and about 900 meters in a straight-line distance from Highway 130. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Warning.

According to news articles, Pahoa is a town with 800-900 residents, and besides homes, contains small shops. A school and a few roads were closed. Crews were building temporary access roads and trying to build berms to divert lava away from the heavily traveled Highway 130, which passes through the town.

On 2 November, the lava flow front stalled, but scattered breakouts occurred upslope of the flow front. HVO documented in their online Photo and Video section that over the past several days leading up to 7 November, the flow had undergone inflation (thickening).

Although an earlier flow lobe had crossed Apa?a Street / Cemetery Road during October, on 9 November witnesses watched as fresh lava crossed asphalt pavement there, causing combustion with yellow flames and black sooty plumes. HVO cautioned that burning roads creates toxic fumes that can cause eye and respiratory tract irritation, as well as headaches, rashes, cough, and possibly cancer. On 25 October just a few hours after the flow crossed the road, the lava was only about 1 m thick. Ten days later, the flow grew to ~4 m thick.

The next map (figure 241) shows the lava’s position as of 10 November 2014 with some earlier dated points of farthest advance indicated. On 10 November a breakout moved along Apa?a Street and onto private property setting an unoccupied home there on fire. According to news sources, this was the first home to be set on fire by the June 27th lava flow. Residents had long ago moved out of the wood frame structure, and had cleared out their belongings. The demise of the structure was widely seen in the news.

Around mid-November a solid-waste transfer station near that portion of the lava flow was the subject of numerous photos, including those documenting flow inflation, burning asphalt pavement, and how a strong cyclone (wire mesh) fence provided a an effective but short-lived barrier. HVO posted a photo disclosing how lava encroached close to the station on 13 November, crossing a fence and most of an access road that loops around the station.

Figure 241. A map (with key) describing Kilauea lava flows on 10 November 2014. On that day, surface activity was present along the N margin in the first few kilometers upslope (W) of the flow tip. For reference, Apa?a Street/Cemetery Road intersects the flow near the breakout farthest to the E. Blue lines depict the modeled steepest lines of descent (see text). Courtesy of HVO.

During an overflight on 1 December volcanologists measured a cross-sectional area of the lava stream within a tube near Pu'u 'O'o. They found a 25% reduction in area compared to the previous week. The result was consistent with less lava flowing through the tube due to summit deflation, which had been ongoing since 29 November.

A 21 December satellite image showed the flow moving towards Pahoa. The image came from the Advanced Land Imager instrument onboard NASA's Earth Observing 1 satellite. The image provided a view of active breakouts on this downslope (E) portion of the flow. Surface lava was active around the leading tip of the flow, but a short distance upslope (W) of the leading tip there was an absence of surface breakouts. About 1.5-2 km W and upslope of the leading tip of the flow, many scattered breakouts were indicated. Thus, HVO concluded, the image emphasizes that lava-flow movement was not limited to the flow front.

Figure 242 shows the lava flow one day before the end of 2014.

Figure 242. A map describing lava flows on 30 December 2014. This large-scale map shows the distal part of Kilauea’s active E rift zone lava flow in relation to nearby Puna communities. The area of the flow on 22 December at 1500 is shown in pink; the areas that widened and advanced by 1430 on 30 December are shown in red. Most surface activity was within the leading 3 km of the flow’s N lobe, but other small breakouts were scattered the flow in an area 7-8 km W of Pahoa (a region HVO described as just N of the True/Mid-Pacific geothermal well pad). One other breakout, outside the map area, was also active near Pu'u O'o. (As we will discuss in our next Bulletin report on Kilauea, the June 27th flow remained active at least as late as April 2015.) Courtesy of HVO.

At the end of 2014, Kilauea continued to erupt both at its summit and at Pu'u O'o along the East rift zone. An overflight on 1 January 2015 confirmed that the front of the 27 June lava flow remained stalled. However, HVO’s Daily Update (issued at 0913 on 1 January) also noted a breakout along the S margin of the flow and 150 m up slope of the flow front, which had advanced ~20 m since the afternoon on the 31st. In addition to the aerial observations, farther back (upslope and W) from the flow front HVO noted that satellite data acquired on 31 December showed areas of activity 3 and 6 km W of the flow front .

Graphical approaches to scientific and hazards communication. The HVO website features a hazard map for Kilauea (HVO, 1997). It shows the relative degree of hazard from lava flows for different areas of the volcano. The E rift zone is within Zone 1, which HVO (1997) states “is the most hazardous; it consists of the summit area and rift zones because Kilauea's frequent eruptions originate in these areas.”

As a result of the June 27th lava flow showing no signs of halting, on 3 December 2014, William P. Kenoi, the mayor of the County of Hawaii signed a proclamation that continued the state of emergency in the Puna district. This followed earlier proclamations signed on 4 September and 16 October 2014.

Figure 243 illustrates the advance of the June 27th lava flow from Pu'u O'o towards infrastructure such as Pahoa and the road through it (HI-130). The W-looking view has the advancing lava heading towards the reader. Figure 243 contains both a plot and an image of the June 27th lava flow, with four lobes identified by color coding (as defined on the right side of the figure). The illustration was posted on social media and serves to educate residents (it is not from a peer-reviewed publication). The same author has generated numerous other graphics associated with the advancing lavas and the geography of the Puna district, including relevant census and economic data, in what are often called infographics. Another example, focusing on roads, is figure 244.

Figure 243. Diagram that shows both a plot (at left) and an oblique view of the land surface (at right) summarizing lava advance as of 23 December 2014. In the view at right the colored lines define some of the critical flow lobes. The plot shows position versus time (during 28 June 2014 to 12 January 2015 in 28-day increments). Pahoa (indicated) resides on route 130 (HI-130). Many of the labeled features (Hawaiian Beaches, Rail Road Avenue, and Government Beach Road) may also be seen in figure 239. Courtesy of Mark Kimura (University of Hawaii at Hilo).
Figure 244. An illustration of approximate drive times between various locations near the June 27th lava flow. The lava covered portion of the Chain of Craters road between Hawaii Volcanoes Nation Park at the W and Kalapana at the E is indicated as the yellow line with red dashes (the gray, lava covered portion, is ~13 km in length). Courtesy of Mark Kimura.

Work began on 24 October 2014 on the emergency access route between Hawai‘i Volcanoes National Park and Kalapana along the historic portion of Chain of Craters Road-Kalapana alignment (yellow and red dashed line, figure 244). The lava-covered portion of that road is ~13-km long. According the National Park Service, the emergency route will assist residents of lower Puna district, whose access to the rest of the island would otherwise be cut off if E-flowing lava were to reach the ocean. According to a news article by Damon Tucker, bulldozers working inward from the E and W ends met in the middle on 6 November. The article noted that the roadbed was still considered ‘rough grade’ and when opened it will be ~6-m wide, 2 lane, and gravel surfaced. The road was intended chiefly for residents (and their agents and service provders) and, as planned, will not be open to the general public or park visitors. On the basis of several reports Bulletin editors found, the road’s projected eventual cost varied within the range of 7-15.5 million dollars.

Lava lake heights in Overlook crater. At the summit, a lava lake resides in Overlook crater (see map of the Kilauea summit caldera area in the previous report, figure 229). Overlook crater is a source of ash, spatter, pelee’s hair, and this area also vents the bulk of the SO2; emissions (discussed in a subsection below). HVO Daily Updates describe Overlook crater as a pit or crater in the floor of the larger Halema`uma`u Crater. That crater resides, in turn, on the floor of the larger Kilauea caldera or crater. The pit is about 160 m in diameter at the ground surface on the Halema`uma`u crater floor. At a depth of 200 m below the Halema`uma`u crater floor (the deepest point visible when the lake drains to those depths) the pit is ~50 m in diameter. HVO Daily Updates also said that a lava pond or lake in the pit has been in evidence since November 2009 and through 2014. The surface of the lake moved up and down and measurements reflect the depth below the crater floor.

Overall, from available data during 27 June to 31 December the lake surface ranged between 30 and 70 m below the pit’s rim at the Halema'ama'u crater floor. During 27 June to 9 July 2014 the lake remained fairly stable at near 30 m depth below the floor. Starting a few days after that and until 19 September the lake was in the approximate range 30-60 m deep. On 20 September it reached ~65 m deep. During 21-24 September daily distances to the lake surface descended with attendant fluctuations to ~70 m deep. During 25 September to 3 November the lake remained in the range of 40-70 m through the end of the year, although the depths were not specifically given during much of November and December.

HVO Daily Updates contain the following general background explaining more about the lava lake. Overlook crater has been more-or-less continuously active since it opened during a small explosive event on 19 March 2008. Small collapses in the Overlook crater are common, and over time have resulted in a gradual enlargement of the Overlook crater. During 2013 and early 2014, the lava level has been typically between 30 m and 60 m below the floor of Halema`uma`u Crater. The lake level responds to summit tilt changes with the lake generally receding during deflation and rising during inflation.

Geophysical monitoring. Geophysical monitoring, including seismicity at the summit was summarized in HVO Daily Updates during 27 June to 30 December. Located earthquakes in the summit area were most reliably reported only during 27 June through 7 August, an interval when they were often in the range 5 to 36 events per day. After that, the number of events was seldom reported although some comments noted an occasional number or a larger event (e.g., on 14 November, an M ~3.5 earthquake on Kilauea’s S flank) and many cases mentioned ‘several’ located earthquakes or commented on a lack of changes in seismicity without further quantification. Tremor and small seismic swarms were noted often. For example, a swarm of long-period earthquakes occurred during 20-21 August centered beneath the summit caldera at ~8 km depth. Epicenters were reported elsewhere (besides the summit), for example on the S flank and various parts of the E rift zone.

In multiple entries during the reporting interval, episodes of tremor were interpreted by HVO as linked to spatter on the surface of the lava lake.

The 19 October Daily Update made these comments about seismicity, tilt, and summit deformation measured by GPS. “A cluster of small seismic events occurred at a shallow level beneath Kilauea's upper East Rift Zone at about the time that ground tilt switched from inflation to deflation. Such behavior is fairly common. Seismic tremor beneath the summit remained low and varied with changes in spattering on the surface of the lava lake. GPS receivers spanning the summit caldera recorded about 5 cm (2 in) of extension between early May and early July [2014]. Since then, little significant extension or contraction has occurred.”

SO2 flux data. Table 1 contains SO2 flux data extracted from HVO Daily Updates for the interval 11 June 2014 through 13 January 2015. Near the start of that interval, during 25 June-1 July 2014, SO2 fluxes at Halema‘uma‘u yielded the highest values of the interval, 8,400 metric tons per day (t/d). This was about 10% higher than the largest value reported in the first half of 2014 (BGVN 39:09). Overall, SO2 fluxes for Pu’u 'O’o and associated E rift zone sources of degassing yielded somewhat elevated values. During the week of 25 June to 1 July 2014 scientists recorded fluxes of 900 t/d, about double the higher values HVO typically reported since July 2012.

Table 11. An overview of approximate and preliminary S02fluxes reported for Kilauea and some associated comments during 11 June 2014 to 13 January 2015. The majority of these measurements were averages or ranges for a week-long interval recording plumes from gases vented at the summit caldera. “Minor ash” represents cases for summit measurements where HVO noted “a tiny amount of particulate material carried aloft by the plume.” Note comment in text below table about the shift in measurement methodology, which resulted in higher values. The measurements in brackets, [ ], record flux estimates on the stated dates from all sources vented on the East Rift Zone (ERZ). For brevity, ERZ measurements during mid-July to mid-September were omitted from the table. All data and quoted text came from HVO Daily Updates (see link in the Information Contacts section).

Date (or range) SO2 flux (metric tons/day, t/d) at summit [East Rift Zone, ERZ]; Comments
11-17 Jun 2,400-6,400 t/d
18-24 Jun

2,800-5,200 t/d

[ERZ on 24th: 250 t/d (“. . . emission rates typically ranged between 150 and 450 t/d since July 2012.”)

25 Jun -01 Jul

3,800-8,400 t/d. Highest value in table.

[ERZ on 27th: 900 t/d; ". . . measured shortly after the new breakout started; emission rates have typically ranged between 150 and 450 t/d since July 2012."]

02-08 Jul 5,800-6,900 t/d (minor ash) [ERZ on 3rd: 500 t/d]
09-15 Jul 4,200-6,300 t/d (minor ash)
16-22 Jul 4,500-5,700 t/d (minor ash)
23-29 Jul 3,700-7,100 t/d (minor ash)
30 Jul-5 Aug 3,600-6,100 t/d (minor ash)
06-12 Aug 5,100 t/d (minor ash)
03-19 Aug 2,400-5,000 t/d (minor ash)
20-26 Aug 4,100-5,900 t/d (minor ash)
27 Aug-02 Sep 3,300-6,700 t/d (minor ash)
03-09 Sep 3,300-7,600 t/d (minor ash)
10-16 Sep 4,300-6,800 t/d (minor ash)
17-23 Sep 4,400-6,300 t/d (minor ash) [ERZ on 24th: 375 t/d]
24-30 Sep 3,600-5,200 t/d (minor ash) [ERZ on 25th: 550 t/d]
08-14 Oct 2,900-6,500 t/d [ERZ on 9th: 450 t/d]
15-21 Oct 2,700-3,600 t/d
22-28 Oct 4,250-7,000 t/d [ERZ on 23rd: 340 t/d]
29 Oct-04 Nov 3,400-6,400 t/d [ERZ on 31st: 320 t/d]
05 Nov 6,200 t/d (but winds thwarted later repeat measurements during week ending on 11th)
18 Nov 4,400 t/d (another 1-day measurement like that above)
19-25 Nov 6,900 t/d
27 Nov-02 Dec 4,300 t/d [ERZ on 26th: 250 t/d]
03-09 Dec 4,100 t/d
10-16 Dec 3,100-6,500 t/d [ERZ on 11th: 300 t/d]
17-23 Dec 5,500-7,700 t/d [ERZ on 19th: 250 t/d]
25-31 Dec 6,000 t/d
31 Dec 2014-06 Jan 2015 5,400 t/d
07-13 Jan 2015 4,500 to 7,600 t/d [ERZ on 7th: ~200 t/d]

HVO emphasized the following caveat described in more detail in (BGVN 39:09). “Starting in 2014, [HVO began reporting] the emission rate estimated by a new, more accurate method. The numbers increase by a factor of 2-4 but the actual emission rate has not changed.”

The gas plume from the summit area (Kilauea caldera), sometimes included minor amounts of ash-sized tephra (sometimes noted in table 1). These included fresh spatter bits and Pele's hair from the circulating lava lake in Overlook crater. In general, the heaviest tephra deposited near the source; the finer tephra, several kilometers downwind.


Kauahikaua, J., 2007, Lava flow hazard assessment, as of August 2007, for Kilauea East Rift Zone eruptions, Hawai'i Island: U.S. Geological Survey Open-File Report 2007-1264, 9 p., ( http://pubs.usgs.gov/of/2007/1264/ )

Kimura, Mark, 23 March 2015, Lower Puna infographics (https://www.facebook.com/lowerpuna) [Accessed in March 2015].

Poland, M.P., Takahashi, T.J., and Landowski, C.M., eds., 2014, Characteristics of Hawaiian volcanoes:

U.S. Geological Survey Professional Paper 1801, 428 p., http://dx.doi.org/10.3133/pp1801.

University of Hawaii at Hilo, 2015, UH Hilo Stories: Puna lava flow in graphics & maps, updated Feb. 22 (http://hilo.hawaii.edu/news/stories/2014/09/22/puna-lava-flow-in-graphics-maps/).

Geologic Background. Kilauea volcano, which overlaps the east flank of the massive Mauna Loa shield volcano, has been Hawaii's most active volcano during historical time. Eruptions of Kilauea are prominent in Polynesian legends; written documentation extending back to only 1820 records frequent summit and flank lava flow eruptions that were interspersed with periods of long-term lava lake activity that lasted until 1924 at Halemaumau crater, within the summit caldera. The 3 x 5 km caldera was formed in several stages about 1500 years ago and during the 18th century; eruptions have also originated from the lengthy East and SW rift zones, which extend to the sea on both sides of the volcano. About 90% of the surface of the basaltic shield volcano is formed of lava flows less than about 1100 years old; 70% of the volcano's surface is younger than 600 years. A long-term eruption from the East rift zone that began in 1983 has produced lava flows covering more than 100 sq km, destroying nearly 200 houses and adding new coastline to the island.

Information Contacts: Hawaiian Volcano Observatory (HVO), U.S. Geological Survey, PO Box 51, Hawai`i National Park, HI 96718, USA (URL: http://hvo.wr.usgs.gov/, Daily Updates, http://hvo.wr.usgs.gov/activity/Kilaueastatus.php, and (weekly) Volcano Watch, http://hvo.wr.usgs.gov/volcanowatch/; Recent maps, http://hvo.wr.usgs.gov/maps); and Mark Kimura, Department of Geography and Environmental Sciences, University of Hawaii at Hilo, Geography Department, 200 W. Kawili St., Hilo, HI 96720-4091.

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 Atmospheric Effects

The enormous aerosol cloud from the March-April 1982 eruption of Mexico's El Chichón persisted for years in the stratosphere, and led to the Atmospheric Effects section becoming a regular feature of the Bulletin. Descriptions of the initial dispersal of major eruption clouds remain with the individual eruption reports, but observations of long-term stratospheric aerosol loading will be found in this section.

View Atmospheric Effects Reports

 Special Announcements

Special announcements of various kinds and obituaries.

View Special Announcements Reports

 Additional Reports

Reports are sometimes published that are not related to a Holocene volcano. These might include observations of a Pleistocene volcano, earthquake swarms, or floating pumice. Reports are also sometimes published in which the source of the activity is unknown or the report is determined to be false. All of these types of additional reports are listed below by subregion and subject.


False Report of Sea of Marmara Eruption

Africa (northeastern) and Red Sea

False Report of Somalia Eruption

Africa (eastern)

False Report of Elgon Eruption

Kermadec Islands

Floating Pumice (Kermadec Islands)

1986 Submarine Explosion

Tonga Islands

Floating Pumice (Tonga)

Fiji Islands

Floating Pumice (Fiji)

New Britain


Andaman Islands

False Report of Andaman Islands Eruptions

Sangihe Islands

1968 Northern Celebes Earthquake

Kawio Barat


False Report of Mount Pinokis Eruption

Southeast Asia

Pumice Raft (South China Sea)

Land Subsidence near Ham Rong

Ryukyu Islands and Kyushu

Pumice Rafts (Ryukyu Islands)

Izu, Volcano, and Mariana Islands

Mikura Seamount

Acoustic Signals in 1996 from Unknown Source

Acoustic Signals in 1999-2000 from Unknown Source

Kuril Islands

Possible 1988 Eruption Plume



Aleutian Islands

Possible 1986 Eruption Plume


False Report of New Volcano




La Lorenza Mud Volcano



Pacific Ocean (Chilean Islands)

False Report of Submarine Volcanism

Central Chile and Argentina

Estero de Parraguirre

West Indies

Mid-Cayman Spreading Center

Atlantic Ocean (northern)

Northern Reykjanes Ridge


Azores-Gibraltar Fracture Zone

Antarctica and South Sandwich Islands

Jun Jaegyu

East Scotia Ridge

 Special Announcements

Special Announcement Reports