Umboi

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 5.589°S
  • 147.875°E

  • 1548 m
    5077 ft

  • 251060
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: September 1985 (SEAN 10:09) Cite 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) Cite 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.

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude
251060

Unknown - Evidence Credible

1548 m / 5077 ft

5.589°S
147.875°E

Volcano Types

Complex
Caldera
Stratovolcano(es)

Rock Types

Major
Basalt / Picro-Basalt
Andesite / Basaltic Andesite
Minor
Dacite

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
249
1,127
5,585
83,275

Geological Summary

Umboi Island, 50 km in its longest dimension, is the largest of the volcanic islands off the N coast of New Guinea. Dominantly basaltic-andesitic, it is comprised of several coalescing stratovolcanoes cut by a 13 x 17 km caldera whose walls rise up to 1 km above its floor. The caldera is widely breached to the sea on the NE side and contains three youthful post-caldera cones with summit crater lakes, Talo, Soal, and Barik. The largest of these cones, 1494-m-high Talo, displays several thermal areas and has satellitic cones on its flanks. No historical eruptions have been reported, but activity of the post-caldera cones is thought to have continued until the last few hundred years (Johnson et al., 1972).

References

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Binns R A, Brodie P, Fulton R, Mapham B, Park S-H, Parr J M, Pinto A, Rees C, Subandrio A, Thomas S, Wama J, Whiting R, 2002. Exploration and Mining Report 939C (Final Cruise Report, RV Franklin, FR-02/2002, “BISMARCK-2002”): Submarine Hydrothermal and Volcanic Activity in the Western Bismarck Island Arc, Papua New Guinea. CSIRO Division of Exploration and Mining, Australia.

Fisher N H, 1957. Melanesia. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 5: 1-105.

Johnson R W, Taylor G A M, Davies R A, 1972. Geology and petrology of Quaternary volcanic islands off the north coast of New Guinea. Aust Bur Min Resour Geol Geophys Rec, 1972/21: 1-127.

Lowenstein P L, 1982. Problems of volcanic hazards in Papua New Guinea. Geol Surv Papua New Guinea Rpt, 82/7: 1-62.

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).

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.


Synonyms

Rooke Island | West Umboi Island | Ruk Island | Siassi Island

Cones

Feature Name Feature Type Elevation Latitude Longitude
Barik Stratovolcano 1287 m 5° 33' 0" S 147° 53' 0" E
Soal Stratovolcano 1320 m 5° 34' 0" S 147° 55' 0" E
Talo Stratovolcano 1454 m 5° 35' 20" S 147° 52' 30" E
Tanglup, Mount Cone 1160 m 5° 36' 0" S 147° 53' 0" E
Vitiaz Knoll Cone -882 m 5° 48' 52" S 147° 37' 49" E

Craters

Feature Name Feature Type Elevation Latitude Longitude
Apalong Crater 1454 m 5° 36' 0" S 147° 52' 0" E
Bono Crater 1320 m 5° 34' 0" S 147° 55' 0" E
Pung Crater 1454 m 5° 36' 0" S 147° 51' 0" E

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/).
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/).

Smithsonian Sample Collections Database


A listing of samples from the Smithsonian collections will be available soon.

Affiliated Sites

Large Eruptions of Umboi 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).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.