Report on Papandayan (Indonesia) — 9 January-15 January 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 9 January-15 January 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Papandayan (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 9 January-15 January 2008. Smithsonian Institution and US Geological Survey.
7.32°S, 107.73°E; summit elev. 2665 m
All times are local (unless otherwise noted)
On 7 January, CVGHM lowered the Alert Level at Papandayan from 2 to 1 (on a scale of 1-4) due to a decrease in activity over approximately four months. Seismic events decreased in number after 2 August 2007, and earthquake tremor was not recorded since 14 November 2007. Data from deformation-monitoring instruments indicated deflation. White fumarolic plumes rose to an altitude of 2.9 km (9,500 ft) a.s.l.
Geologic Background. Papandayan is a complex stratovolcano with four large summit craters, the youngest of which was breached to the NE by collapse during a brief eruption in 1772 and contains active fumarole fields. The broad 1.1-km-wide, flat-floored Alun-Alun crater truncates the summit of Papandayan, and Gunung Puntang to the north gives a twin-peaked appearance. Several episodes of collapse have created an irregular profile and produced debris avalanches that have impacted lowland areas. A sulfur-encrusted fumarole field occupies historically active Kawah Mas ("Golden Crater"). After its first historical eruption in 1772, in which collapse of the NE flank produced a catastrophic debris avalanche that destroyed 40 villages and killed nearly 3000 people, only small phreatic eruptions had occurred prior to an explosive eruption that began in November 2002.