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Umboi

Photo of this volcano
  • Papua New Guinea
  • Melanesia and Australia
  • Complex
  • Unknown - Evidence Credible
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 5.589°S
  • 147.875°E

  • 1548 m
    5079 ft

  • 251060
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: September 1985 (SEAN 10:09) Citation IconCite this Report

Seismicity; subsidence in flank thermal area

"Following damaging earthquakes and changes at a thermal area on Umboi Island during August, local people were concerned about possible volcanic activity. A brief visit was made to Umboi by R. W. Johnson (Bureau of Mineral Resources, Canberra) on 5 September. He reported no signs of imminent volcanic threat but recommended that an officer from Rabaul Volcano Observatory (RVO) visit Umboi for further investigations.

"On 12 September, inspection of the thermal area on the W flank of Talo volcano (on the W side of Umboi Island) indicated that no increase in temperature had occurred. However, local subsidence had taken place. This was probably due to strong shaking of the ground during the strongest earthquake on 19 August.

"Nine local earthquakes were recorded 11-14 September, two reportedly felt. These earthquakes are probably local to Umboi Island, but it is uncertain whether they are directly related to the volcano. Seismic records indicate that earthquakes were continuing at a low level in mid-September."

Information Contacts: J. Mori, RVO.

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

Bulletin Reports - Index

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.

09/1985 (SEAN 10:09) Seismicity; subsidence in flank thermal area




Information is preliminary and subject to change. All times are local (unless otherwise noted)


September 1985 (SEAN 10:09) Citation IconCite this Report

Seismicity; subsidence in flank thermal area

"Following damaging earthquakes and changes at a thermal area on Umboi Island during August, local people were concerned about possible volcanic activity. A brief visit was made to Umboi by R. W. Johnson (Bureau of Mineral Resources, Canberra) on 5 September. He reported no signs of imminent volcanic threat but recommended that an officer from Rabaul Volcano Observatory (RVO) visit Umboi for further investigations.

"On 12 September, inspection of the thermal area on the W flank of Talo volcano (on the W side of Umboi Island) indicated that no increase in temperature had occurred. However, local subsidence had taken place. This was probably due to strong shaking of the ground during the strongest earthquake on 19 August.

"Nine local earthquakes were recorded 11-14 September, two reportedly felt. These earthquakes are probably local to Umboi Island, but it is uncertain whether they are directly related to the volcano. Seismic records indicate that earthquakes were continuing at a low level in mid-September."

Information Contacts: J. Mori, RVO.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Eruptive History

The Global Volcanism Program is not aware of any Holocene eruptions from Umboi. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Umboi page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

Deformation History

There is no Deformation History data available for Umboi.

Emission History

There is no Emissions History data available for Umboi.

Photo Gallery

The small circular island at the top-center is Sakar, the NE-most of a chain of volcanic islands off the northern coast of Papua New Guinea. The 8 x 10 km wide island, seen in this Space Shuttle image with north to the upper left, is an incised stratovolcano with a summit crater lake. No historical eruptions are known from Sakar, but a pyroclastic cone on the southern flank of the volcano may be of Holocene age. The 50-km-wide island of Umboi, whose left side is cut by a large caldera breached to the NE, fills the center of the image.

NASA Space Shuttle image STS50-100-D, 1992 (http://eol.jsc.nasa.gov/).
See title for photo information.
The 50-km-long island of Umboi, the largest of the volcanic islands off the north coast of New Guinea, is seen in this Space Shuttle image with north to the upper right. A large 13 x 17 km caldera cuts the northern half of the island and is widely breached to the NE (top-center). Three youthful post-caldera cones with summit crater lakes (left-center) are visible rising above the smooth-surfaced caldera floor. The large eroded massif at the right-center is an older volcanic complex, as is the dissected northern tip of the island (upper left).

NASA Space Shuttle image STS50-99-748-47, 2000 (http://eol.jsc.nasa.gov/).
See title for photo information.
GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.

Title: Umboi
Publisher: PNG Topographic Survey
Country: PNG
Year: 1985
Series: T601
Map Type: Topographic
Scale: 1:100,000
Map of Umboi
Title: Talawe
Publisher: PNG Topographic Survey
Country: PNG
Year: 1983
Series: T601
Map Type: Topographic
Scale: 1:100,000
Map of Talawe
Title: Madang
Publisher: US Army Map Service
Country: PNG, Indonesia
Year: 1943
Series: AMS
Map Type: Topographic
Scale: 1:1,000,000
Map of Madang
Smithsonian Sample Collections Database

There are no samples for Umboi in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

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