Report on Raung (Indonesia) — July 1989
Scientific Event Alert Network Bulletin, vol. 14, no. 7 (July 1989)
Managing Editor: Lindsay McClelland.
Raung (Indonesia) Numerous small explosions
Please cite this report as:
Global Volcanism Program, 1989. Report on Raung (Indonesia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 14:7. Smithsonian Institution. https://dx.doi.org/10.5479/si.GVP.SEAN198907-263340.
8.119°S, 114.056°E; summit elev. 3260 m
All times are local (unless otherwise noted)
During the last week of July, 45 visible explosions ejected plumes to 75-150 m above the summit before winds carried them S. Between explosions, weak white fumes reached 50 m above the crater. Recorded earthquakes were: distant tectonic (50), local tectonic (2), volcanic A-type (1), volcanic B-type (2), explosions (1,574), and volcanic tremor (1).
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.