Report on Raung (Indonesia) — 3 May-9 May 2023
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 3 May-9 May 2023
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2023. Report on Raung (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 3 May-9 May 2023. Smithsonian Institution and US Geological Survey.
8.119°S, 114.056°E; summit elev. 3260 m
All times are local (unless otherwise noted)
PVMBG reported that during 1-30 April white steam-and-gas plumes of moderate intensity rose as high as 200 m above Raung’s summit. Monitoring data along with visual observations did not suggest elevated levels of activity. The Alert Level was lowered to 1 (on a scale of 1-4) on 2 May and the pubic was reminded to stay 500 m away from the crater.
Geological Summary. 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.