Report on Sorikmarapi (Indonesia) — 7 December-13 December 2011
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 7 December-13 December 2011
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2011. Report on Sorikmarapi (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 7 December-13 December 2011. Smithsonian Institution and US Geological Survey.
0.686°N, 99.539°E; summit elev. 2145 m
All times are local (unless otherwise noted)
CVGHM reported increased seismicity from Sorik Marapi during 1-12 December and white plumes rose 40-50 m above the summit. CVGHM raised the Alert Level on 12 December from 1 to 2 (on a scale of 1-4) based on seismic data.
Geologic Background. Sorikmarapi is a forested stratovolcano with a 600-m-wide summit crater containing a lake and substantial sulfur deposits. A smaller parasitic crater (Danau Merah) on the upper SE flank also contains a crater lake; these two craters and a series of smaller explosion pits occur along a NW-SE line. Several solfatara fields are located on the E flank. Phreatic eruptions have occurred from summit and flank vents during the 19th and 20th centuries.