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Report on Dieng Volcanic Complex (Indonesia) — 23 September-29 September 2009

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 23 September-29 September 2009
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2009. Report on Dieng Volcanic Complex (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 23 September-29 September 2009. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (23 September-29 September 2009)


Dieng Volcanic Complex

Indonesia

7.2°S, 109.879°E; summit elev. 2565 m

All times are local (unless otherwise noted)


CVGHM reported that on 26 September a "thunderous" noise from Dieng was heard from 2 km away. The next day, a phreatic eruption from an unspecified crater ejected mud as far away as 140 m S. The deposits were as thick as 10 cm near the vent and 1 cm near the farthest point. The Alert Level remained at 1 (on a scale of 1-4).

Geologic Background. The Dieng plateau in the highlands of central Java is renowned both for the variety of its volcanic scenery and as a sacred area housing Java's oldest Hindu temples, dating back to the 9th century CE. The Dieng volcanic complex consists of two or more stratovolcanoes and more than 20 small craters and cones of Pleistocene-to-Holocene age over a 6 x 14 km area. Prahu stratovolcano was truncated by a large Pleistocene caldera, which was subsequently filled by a series of dissected to youthful cones, lava domes, and craters, many containing lakes. Lava flows cover much of the plateau, but have not occurred in historical time, when activity has been restricted to minor phreatic eruptions. Toxic gas emissions are a hazard at several craters and have caused fatalities. The abundant thermal features and high heat flow make Dieng a major geothermal prospect.

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