Report on Raung (Indonesia) — 5 August-11 August 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 August-11 August 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Raung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 5 August-11 August 2015. Smithsonian Institution and US Geological Survey.
8.119°S, 114.056°E; summit elev. 3260 m
All times are local (unless otherwise noted)
Based on weather models, webcam views, and information from PVMBG, the Darwin VAAC reported that during 5-11 August ash plumes from Raung rose to altitudes of 4.3-5.2 km (14,000-17,000 ft) a.s.l. and drifted as far as 760 km ESE, SE, SSE, and SW.
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.