Report on Raung (Indonesia) — August 1991
Bulletin of the Global Volcanism Network, vol. 16, no. 8 (August 1991)
Managing Editor: Lindsay McClelland
Raung (Indonesia) Dense plumes
Please cite this report as:
Global Volcanism Program, 1991. Report on Raung (Indonesia). In: McClelland, L (ed.), Bulletin of the Global Volcanism Network, 16:8. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN199108-263340.
8.119°S, 114.056°E; summit elev. 3260 m
All times are local (unless otherwise noted)
The crew of Qantas flight 41 (Sydney-Jakarta) observed a very dense black plume emerging intermittently from a flank vent on 10 September at 1508. The plume was drifting N at ~6 km altitude, well below the aircraft's altitude of nearly 12 km. A voluminous, dense, mostly white plume with small pulses of ash in its center was observed from a commercial flight two days later.
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: ICAO; J. Post, SI.