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Koryaksky

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  • Country
  • Subregion Name
  • Volcano Type
  • Last Known Eruption
  • 3456 m
    11336 ft
  • 53.320°
  • 158.688°
  • Elevation
  •  
  • Latitude
  • Longitude

4 November-10 November 2009

KVERT reported that during 30 October-6 November seismic activity from Koryaksky did not exceed background levels. Fumarolic activity was noted on 29 October and during 4-5 November. The Level of Aviation Color Code was lowered to Green.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)



 Available Weekly Reports




2009: February | March | April | June | August | September | November |
2008: December |
2003: December |

4 November 2009              Back to Top

KVERT reported that during 30 October-6 November seismic activity from Koryaksky did not exceed background levels. Fumarolic activity was noted on 29 October and during 4-5 November. The Level of Aviation Color Code was lowered to Green.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

2 September 2009              Back to Top

KVERT reported that activity from Koryaksky decreased on 27 August and remained low through 4 September. Gas-and-steam plumes rose to an altitude of 3.7 km (12,100 ft) a.s.l. and drifted in multiple directions. Tremor was detected by the seismic network during 27-28 August and 1 September. The Aviation Color Code level was lowered to Yellow.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

26 August 2009              Back to Top

KVERT reported that seismic activity from Koryaksky was slightly above background levels during 20-23 August and at background levels during 24-27 August. Ash plumes were seen in satellite imagery drifting more than 385 km in easterly directions. Gas-and-steam plumes containing ash that rose to an altitude of 3.7 km (12,100 ft) a.s.l. were seen drifting in multiple directions during 26-27 August. The Level of Concern Color Code remained at Orange.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

19 August 2009              Back to Top

KVERT reported that during 14-21 August seismic activity from Koryaksky was slightly above background levels. During 13-16 August, gas-and-steam plumes rose to altitudes of 3.5-5 km (11,500-16,400 ft) a.s.l. Based on visual observations during 16-20 August, gas-and-steam plumes containing ash rose to altitudes of 3.5-4.2 km (11,500-13,800 ft) a.s.l. and drifted in multiple directions. Ash plumes were also seen in satellite imagery, drifting 215 km E and W. On 23 August, a probable ash plume detected in satellite imagery drifted 50 km ESE. During 24-25 August, seismicity increased; more than 100 earthquakes were recorded. The Level of Concern Color Code remained at Orange.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

12 August 2009              Back to Top

KVERT reported that during 10-12 August seismic activity from Koryaksky was above background levels. On 12 August, an ash plume seen on satellite imagery drifted 180 km ESE at an altitude of 3.5 km (11,500 ft) a.s.l. During 15-16 August seismic activity increased, and seismic tremor was detected. On 16 August, a gas plume with a small amount of ash was seen on satellite imagery drifting 80 km WNW. During 17-18 August, an ash plume rose to an altitude of 4 km (13,100 ft) a.s.l. Ashfall up to 1 mm thick was reported in areas to the SW. The Level of Concern Color Code was raised to Orange.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

17 June 2009              Back to Top

Moderate to strong fumarolic activity at Koryaksky has been reported by KVERT in recent weeks. Satellite data showed a weak thermal anomaly over the volcano 11 and 13 June. The Level of Concern Color Code remained at Yellow.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

22 April 2009              Back to Top

During 17-25 April, KVERT reported that seismic activity at Koryaksky was above background levels and weak volcanic tremor was detected. Gas plumes containing a small amount of ash drifted in multiple directions during 17-18 April. On 17 and 18 April, gas-and-ash plumes were also seen on satellite imagery and drifted 100 km NE. On 20 April, a sulfur dioxide plume extended about 15 km from the volcano. During 26-28 April, seismic activity decreased to background levels; tremor was occasionally detected. The Level of Concern Color Code was lowered to Yellow.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

15 April 2009              Back to Top

During 10-17 April, KVERT reported that seismic activity at Koryaksky was above background levels. Gas-and-ash plumes were seen on satellite imagery and drifted 30-680 km in multiple directions. The Level of Concern Color Code remained Orange. Based on information from the Yelizovo Airport and analysis of satellite imagery, the Tokyo VAAC reported that during 18 and 21 April ash plumes rose to altitudes of 3.7-4.6 km (12,000-15,000 ft) a.s.l. and drifted S, SW, W, and NE.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT) , Tokyo Volcanic Ash Advisory Center (VAAC)

8 April 2009              Back to Top

KVERT reported that seismic activity at Koryaksky was elevated on 7 and 8 April and at background levels on the other days during 3-10 April. Weak volcanic tremor was detected on 7 April. Gas plumes containing a small amount of ash originating from two vents on the NW flank rose to an altitude of 5.4 km (17,700 ft) a.s.l. and drifted NE, NW, SE, and SW during the reporting period. Gas-and-ash plumes were also seen on satellite imagery and drifted 290 km in multiple directions. On 11 April, KVERT staff reported ashfall in Petropavlovsk-Kamchatsky (30 km S). Ash accumulated to 0.1-2.5 cm thickness near the Institute of Volcanology and Seismology (IVS) FED RAS. The Level of Concern Color Code remained Orange.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

1 April 2009              Back to Top

KVERT reported that seismic activity at Koryaksky was at background levels during 27 March-3 April. Gas plumes containing a small amount of ash rose to an altitude of 4 km (13,200 ft) a.s.l. and drifted E, SE, S, and W during the reporting period. During 27-28 and 31 March, and 1-2 April, gas-and-ash plumes were also seen on satellite imagery and drifted 313 km E, in southerly directions. The Level of Concern Color Code remained Orange.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

25 March 2009              Back to Top

KVERT reported that seismic activity at Koryaksky was at background levels during 20-27 March. Gas plumes containing a small amount of ash rose to an altitude of 4 km (13,200 ft) a.s.l. and drifted S, SE, W and NW during the reporting period. On 25 and 26 March, gas-and-ash plumes were also seen on satellite imagery and drifted 225 km SE. The Level of Concern Color Code remained Orange.

Based on information from the Yelizovo Airport and KEMSD, and analysis of satellite imagery, the Tokyo VAAC reported that during 26-27 and 29 March ash plumes rose to altitudes of 3-3.7 km (10,000-12,000 ft) a.s.l. and drifted S, SW, and W.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT) , Tokyo Volcanic Ash Advisory Center (VAAC)

18 March 2009              Back to Top

KVERT reported that seismic activity at Koryaksky was elevated on 13 March and at background levels on the other days during 14-20 March. Observers reported that gas plumes containing a small amount of ash rose to an altitude of 4 km (13,200 ft) a.s.l. and drifted in easterly directions during the reporting period. The plumes were also seen on satellite imagery drifting 140 km away from the volcano. Ash was emitted from the upper fumarolic vent and covered the flanks. The Level of Concern Color Code remained Orange.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

11 March 2009              Back to Top

KVERT reported that seismic activity at Koryaksky was elevated on 6 and 8 March and at background levels on the other days during 7-13 March. Observers reported that gas plumes containing a small amount of ash rose to an altitude of 4 km (13,200 ft) a.s.l. and drifted in multiple directions during the reporting period. The plumes were also seen on satellite imagery. Ash deposits were seen near the volcano. The Level of Concern Color Code remained Orange.

Based on information from the Yelizovo Airport and KVERT, the Tokyo VAAC reported that during 11-12 and 15 March ash plumes rose to altitudes of 3-5.2 km (10,000-17,000 ft) a.s.l. and drifted S, SE, E, and N.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT) , Tokyo Volcanic Ash Advisory Center (VAAC)

4 March 2009              Back to Top

KVERT reported that seismic activity at Koryaksky was above background levels on 3 March and at background levels on the other days during 27 February-6 March. Observers reported that during 3-5 March gas plumes containing a small amount of ash rose to an altitude of 3.7 km (12,100 ft) a.s.l. and drifted ENE, E, and SE. The plumes were also seen on satellite imagery. Ash deposits were seen at the summit, and on the N flank at a thickness of about 4 cm. Ash deposits 1-2 mm thick had accumulated in an area between Koryaksky and Avachinsky volcanoes. A weak new fumarole was seen in the crater. The Level of Concern Color Code remained Orange.

Based on information from the Yelizovo Airport, the Tokyo VAAC reported ash on 8 March. On 10 March, an ash plume rose to an altitude of 3.7 km (12,000 ft) a.s.l. and drifted SE.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT) , Tokyo Volcanic Ash Advisory Center (VAAC)

25 February 2009              Back to Top

KVERT reported that during 25 February-4 March seismic activity at Koryaksky was at background levels. Observers reported that during 3-4 March gas plumes containing a small amount of ash rose to an altitude of 3.7 km (12,100 ft) a.s.l. and drifted more than 200 km ENE. Ash deposits were seen at the summit. Ash deposits 1-2 mm thick accumulated in an area between Koryaksky and Avachinsky volcanoes. The Level of Concern Color Code was raised to Orange.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

31 December 2008              Back to Top

KVERT reported that during 26 December-7 January seismic activity at Koryaksky was at background levels. Observers reported that during 30-31 December gas-and-steam plumes possibly containing a small amount of ash drifted along the surface of the NW flank. During 6-7 January gas-and-steam plumes drifted SW. The Level of Concern Color Code was lowered to Yellow.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

24 December 2008              Back to Top

KVERT reported that during 23-24 December gas-and-steam plumes from Koryaksky containing a small amount of ash were detected on satellite images. On 24 December observers from the Nalychevo valley reported that a dark plume rose 200-300 m from a fumarolic vent (about 3 km a.s.l.) on the NW flank of Koryaksky and a boom was heard later that night. Ash plumes detected in satellite imagery on 25 December drifted about 200 km NE. On 28 December, KVERT raised the Alert Level to Orange and reported that a Vulcanian eruption was occurring. Ash plumes rose to an altitude of 4 km (13,200 ft) a.s.l. and drifted NW.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT)

3 December 2003              Back to Top

According to a press report, a M 3.6 earthquake followed by ~2 hours of seismicity at ~6 km depth was detected at Koryaksky.

Sources: RIA Novosti



Summary of eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2008 Dec 23 (?) 2009 Aug 27 Confirmed 1 Historical Upper NW flank (3000 m)
1956 Dec 1957 Jun Confirmed 2 Historical Summit and upper NW flank (3000 m)
1926 Dec 22 1926 Dec 22 Confirmed 1 Historical
[ 1895 Oct 15 ± 45 days ] [ 1896 ] Discredited    
1890 ± 3 years Unknown Confirmed 1 Historical Upper SW flank
1550 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected) South and SW flanks
1950 BCE ± 300 years Unknown Confirmed   Radiocarbon (uncorrected) South and SW flanks
5050 BCE (?) Unknown Confirmed   Tephrochronology

The large symmetrical Koryaksky stratovolcano is the most prominent landmark of the NW-trending Avachinskaya volcano group, which towers above Kamchatka's largest city, Petropavlovsk. Erosion has produced a ribbed surface on the eastern flanks of the 3456-m-high volcano; the youngest lava flows are found on the upper western flank and below SE-flank cinder cones. No strong explosive eruptions have been documented during the Holocene. Extensive Holocene lava fields on the western flank were primarily fed by summit vents; those on the SW flank originated from flank vents. Lahars associated with a period of lava effusion from south- and SW-flank fissure vents about 3900-3500 years ago reached Avacha Bay. Only a few moderate explosive eruptions have occurred during historical time. Koryaksky's first historical eruption, in 1895, also produced a lava flow.