Report on Dieng Volcanic Complex (Indonesia) — 14 January-20 January 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 14 January-20 January 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, 14 January-20 January 2009. Smithsonian Institution and US Geological Survey.
Dieng Volcanic Complex
7.2°S, 109.879°E; summit elev. 2565 m
All times are local (unless otherwise noted)
CVGHM reported that on 15 January two minor phreatic eruptions from Dieng's Sibanteng crater ejected material that fell within a 50 m radius. The ejecta and a landslide dammed up an area of the Kali Putih River. The Alert Level was raised to 2 (on a scale of 1-4) due to increased activity from Dieng and the potential for flash flooding from a dam breach.
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.