Tanga

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 3.5°S
  • 153.22°E

  • 472 m
    1548 ft

  • 254801
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: October 1999 (BGVN 24:10) Cite this Report


Possible uplift or growth of Lif Island over two decades

During 1999 concerned local residents reported two decades of 'unusual growth' of Lif Island, the western island on the rim of the partially submerged ~5-km-diameter caldera of Tanga volcano. An inspection by scientists from the Rabaul Volcano Observatory showed no obvious signs of uplift, but apical spits of raised reef estimated as being up to 1 m above sea level in Wallace and others (1983), were estimated to be more than 2 m high when visited (although it is not certain the same features are being described). Numerous coastal warm springs are present on all three islands marking the submerged caldera rim. A GPS network has been installed to monitor the caldera.

Elderly residents also graphically described the sudden appearance of two islands in the middle of the caldera about 60 years ago (pre-World War II), which they claimed have subsequently grown in size. These islands consist of Bitlik, 300 m in diameter and 35 m high, and Bitbok, 600 m long and 90 m high; both are made up of well-jointed Q-trachyte (Johnson and others, 1976) with dates of 1.08-1.14 m.y. (Wallace and others, 1983). The initial uplift was said to have been accompanied by "big white smoke" and "a big wave people had to run from." Although a British Admiralty Chart of 1886 (no. 2766) shows that the two islands were then in existence and of a similar size, these stories, of the local oral history, may relate to an earlier event. The RVO staff extends their thanks to Deborah Hall (The British Library, Map Library, London) and Brian D. Thynne (National Maritime Museum, London) for their assistance.

References. Johnson, R.W., Wallace, D.A., and Ellis, D.J., 1976, Feldspathoid-bearing potassic rocks and associated types from volcanic islands off the coast of New Ireland, Papua New Guinea: a preliminary account of geology and petrology, in Johnson, R.W. (editor): Volcanism in Australasia, 297-316.

Licence, P.S., Terrill, J.E., and Fergusson, L.J., 1987, Epithermal gold mineralisation, Ambitle Island, Papua New Guinea: Proceedings of the Conference, Pacific Rim Congress 87.

Wallace, D.A., Johnson, R.W., Chappell, B.W., Arculus, R.J., Perfit, M.R., and Crick, I.H., 1983, Cainozoic volcanism of the Tabar, Lihir, Tanga, and Feni Islands, Papua New Guinea: geology, whole-rock analysis, and rock-forming mineral compositions: B.M.R., Aust. Report 243.

Information Contacts: Ima Itikarai and Steve Saunders, Rabaul Volcano Observatory (RVO), P.O. Box 386, Rabaul, Papua New Guinea (Email: rvo@datec.com.pg).

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

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.

10/1999 (BGVN 24:10) Possible uplift or growth of Lif Island over two decades




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


October 1999 (BGVN 24:10) Cite this Report


Possible uplift or growth of Lif Island over two decades

During 1999 concerned local residents reported two decades of 'unusual growth' of Lif Island, the western island on the rim of the partially submerged ~5-km-diameter caldera of Tanga volcano. An inspection by scientists from the Rabaul Volcano Observatory showed no obvious signs of uplift, but apical spits of raised reef estimated as being up to 1 m above sea level in Wallace and others (1983), were estimated to be more than 2 m high when visited (although it is not certain the same features are being described). Numerous coastal warm springs are present on all three islands marking the submerged caldera rim. A GPS network has been installed to monitor the caldera.

Elderly residents also graphically described the sudden appearance of two islands in the middle of the caldera about 60 years ago (pre-World War II), which they claimed have subsequently grown in size. These islands consist of Bitlik, 300 m in diameter and 35 m high, and Bitbok, 600 m long and 90 m high; both are made up of well-jointed Q-trachyte (Johnson and others, 1976) with dates of 1.08-1.14 m.y. (Wallace and others, 1983). The initial uplift was said to have been accompanied by "big white smoke" and "a big wave people had to run from." Although a British Admiralty Chart of 1886 (no. 2766) shows that the two islands were then in existence and of a similar size, these stories, of the local oral history, may relate to an earlier event. The RVO staff extends their thanks to Deborah Hall (The British Library, Map Library, London) and Brian D. Thynne (National Maritime Museum, London) for their assistance.

References. Johnson, R.W., Wallace, D.A., and Ellis, D.J., 1976, Feldspathoid-bearing potassic rocks and associated types from volcanic islands off the coast of New Ireland, Papua New Guinea: a preliminary account of geology and petrology, in Johnson, R.W. (editor): Volcanism in Australasia, 297-316.

Licence, P.S., Terrill, J.E., and Fergusson, L.J., 1987, Epithermal gold mineralisation, Ambitle Island, Papua New Guinea: Proceedings of the Conference, Pacific Rim Congress 87.

Wallace, D.A., Johnson, R.W., Chappell, B.W., Arculus, R.J., Perfit, M.R., and Crick, I.H., 1983, Cainozoic volcanism of the Tabar, Lihir, Tanga, and Feni Islands, Papua New Guinea: geology, whole-rock analysis, and rock-forming mineral compositions: B.M.R., Aust. Report 243.

Information Contacts: Ima Itikarai and Steve Saunders, Rabaul Volcano Observatory (RVO), P.O. Box 386, Rabaul, Papua New Guinea (Email: rvo@datec.com.pg).

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude
254801

Unknown - Unrest / Pleistocene

472 m / 1548 ft

3.5°S
153.22°E

Volcano Types

Stratovolcano
Caldera
Lava dome(s)

Tectonic Setting

Subduction zone
Crustal thickness unknown

Geological Summary

Malendok, Lif and Tefa islands are remnants of the summit of a mostly submerged stratovolcano. In the center of the caldera, the small islands of Bitlik and Bitbok mark remnants of early Pleistocene post-caldera lava domes marking the volcano's latest activity. A small hot spring on Malendok Islands marks the only current thermal activity.

References

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

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Wallace D A, Johnson R W, Chappell B W, Arculus R J, Perfit M R, Crick I H, 1983. Cainozoic volcanism of the Tabar, Lihir, Tanga, and Feni Islands, Papua New Guinea: geology, whole-rock analyses, and rock-forming mineral compositions. Aust Bur Min Resour Geol Geophys Rpt, 243: 1-62.

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

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

The Global Volcanism Program has no photographs available for Tanga.

Smithsonian Sample Collections Database


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

Affiliated Sites

Large Eruptions of Tanga 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.