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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 5.2°S
  • 148.57°E

  • Unknown

  • 252001
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Unnamed.

The Global Volcanism Program has no Weekly Reports available for Unnamed.

Index of Monthly Reports

Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

07/1983 (SEAN 08:07) Earthquake swarm; sounds and glow

Contents of Monthly Reports

All information contained in these reports is preliminary and subject to change.

All times are local (= UTC + 10 hours)

07/1983 (SEAN 08:07) Earthquake swarm; sounds and glow

"An unnamed seamount, 30 km NNE of Cape Gloucester, western New Britain, may have been the site of a short-lived eruption on 15-16 June. A subcontinuous swarm of long-period earthquakes was registered by several seismic stations in Papua New Guinea at 1913-2001 on 15 June and 0427-0450 on 16 June. The swarm was recognized when the records were analyzed at RVO in early July. Preliminary determinations indicated shallow origins over a broad area at the W extremity of New Britain.

"Inquiries with the local people resulted in accounts of sounds like a jet plane coming from the sea, and glow in the sea a long distance from the coast. Northeastward migration of the incandescence was also reported, possibly suggesting a fissure eruption. Airborne observations on 28 July failed to find water discolouration or any other evidence of the 6-week-old event.

"Until further information is obtained, the most likely source for these phenomena is a large seamount mapped in the general area of earthquake locations and visible reports."

Information Contacts: P. de Saint Ours and C. McKee, RVO.

An unnamed seamount 30 km NNE of Cape Gloucester on the NW tip of New Britain is considered the most likely source of an unconfirmed submarine eruption report during 1983. An earthquake swarm accompanied the event. Local inhabitants heard sounds and saw a glow in the sea, although no firm evidence exists that a submarine eruption took place.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1983 Jun 15 ] [ 1983 Jun 16 ] Uncertain    

The Global Volcanism Program has no synonyms or subfeatures listed for Unnamed.

The Global Volcanism Program has no photographs available for Unnamed.

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Johnson R W, 1990. . (pers. comm.).

Smithsonian Institution-SEAN, 1975-89. [Monthly event reports]. Bull Scientific Event Alert Network (SEAN), v 1-14.

Volcano Types


Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

No Data (checked)


Within 5 km
Within 10 km
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Within 100 km

Affiliated Databases

Large Eruptions of Unnamed Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.