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Report on Dempo (Indonesia) — 20 September-26 September 2006

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 September-26 September 2006
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2006. Report on Dempo (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 20 September-26 September 2006. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (20 September-26 September 2006)


Dempo

Indonesia

4.016°S, 103.121°E; summit elev. 3142 m

All times are local (unless otherwise noted)


Increased seismicity at Dempo resulted in an elevation of the hazard status to Alert Level 2.

Geologic Background. Dempo is a prominent stratovolcano that rises above the Pasumah Plain of SE Sumatra. The andesitic volcanic complex has two main peaks, Gunung Dempo and Gunung Marapi, constructed near the SE rim of a 3 x 5 km caldera breached to the north. The Dempo peak is slightly lower, and lies at the SE end of the summit complex. The taller Marapi cone was constructed within a crater cutting the older Gunung Dempo edifice. Remnants of seven craters are found at or near the summit, with volcanism migrating WNW over time. The large, 800 x 1100 m wide historically active crater cuts the NW side of the Marapi cone and contains a 400-m-wide lake located at the far NW end of the crater complex. Historical eruptions have been restricted to small-to-moderate explosive activity that produced ashfall near the volcano.

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