Report on Raung (Indonesia) — 1 January-7 January 2014

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 1 January-7 January 2014
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2014. Report on Raung (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 1 January-7 January 2014. Smithsonian Institution and US Geological Survey.

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Raung

Indonesia

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

All times are local (unless otherwise noted)


PVMBG reported that on 1 January seismicity at Raung increased, on 3 January diffuse white gas plumes rose 100 m and drifted W, and on 4 January diffuse brownish plumes also rose 100 m and drifted W. On 5 January the Alert Level was raised to 2 (on a scale of 1-4).

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.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)