Report on Raung (Indonesia) — May 1989

Scientific Event Alert Network Bulletin, vol. 14, no. 5 (May 1989)
Managing Editor: Lindsay McClelland

Raung (Indonesia) Strombolian activity and seismicity

Please cite this report as:

Global Volcanism Program, 1989. Report on Raung (Indonesia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 14:5. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.SEAN198905-263340.

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Raung

Indonesia

8.119°S, 114.056°E; summit elev. 3260 m

All times are local (unless otherwise noted)


Strombolian activity in the bottom of the crater was photographed by Michel Halbwach (Univ of Savoie, France) in July/August 1988, during overflights in an ultralight aircraft arranged in cooperation with the Federation Aerosport of Indonesia (FASI). Activity was continuing in March, when brownish plumes that rose 100-150 m above the summit were seen 41 times. Recorded March seismicity included: 1,771 episodes of volcanic tremor and plume emission tremor, 90 strong tectonic earthquakes, one local tectonic earthquake, and one A-type and 11 B-type volcanic earthquakes.

Additional aerial monitoring of activity at Raung and other volcanoes has been proposed by FASI and VSI.

Geologic Background. Raung, one of Java's most active volcanoes, is a massive stratovolcano in easternmost Java that was constructed SW of the rim of Ijen caldera. The unvegetated summit is truncated by a dramatic steep-walled, 2-km-wide caldera that has been the site of frequent historical eruptions. A prehistoric collapse of Gunung Gadung on the W flank produced a large debris avalanche that traveled 79 km, reaching nearly to the Indian Ocean. Raung contains several centers constructed along a NE-SW line, with Gunung Suket and Gunung Gadung stratovolcanoes being located to the NE and W, respectively.

Information Contacts: VSI.