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Report on Papandayan (Indonesia) — 10 August-16 August 2011


Papandayan

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 10 August-16 August 2011
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2011. Report on Papandayan (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 10 August-16 August 2011. Smithsonian Institution and US Geological Survey.

Weekly Report (10 August-16 August 2011)

Papandayan

Indonesia

7.3175°S, 107.7306°E; summit elev. 2643 m

All times are local (unless otherwise noted)


On 13 August CVGHM reported that based on seismicity, deformation, geochemistry, and visual observations, the Alert Level for Papandayan was raised to 3 (on a scale of 1-4). During 1 June-12 August sulfur plumes rose 20-75 m above the vents. During the same period, seismicity increased with several hundreds of earthquakes detected per month. Temperature measurements in the Manuk thermal area indicated a relative increase from 29 June to 12 August and deformation measurements indicated inflation from 4 July to 10 August. Visitors and residents were not to venture within 2 km of the active crater.

Geological Summary. Papandayan is a complex stratovolcano at the S end of a curved volcanic massif with Kendang volcano ~9 km away at the N end, Gunung Puntang ~3.5 km NNE, and Gunung Jaya ~6 km NNE. Several episodes of collapse have created an irregular profile and produced debris avalanches that have affected lowland areas. The summit area includes four large craters, including the 1.1-km-wide, flat-floored Alun-Alun crater. A sulfur-encrusted fumarole field occupies the active Kawah Mas ("Golden Crater"). The first reported eruption, in 1772 CE, included a collapse of the NE flank and a debris avalanche that destroyed 40 villages and killed almost 3,000 people. Smaller phreatic eruptions occurred during 1923-25, 1942, and 2002.

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