Report on Dieng Volcanic Complex (Indonesia) — 11 May-17 May 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 11 May-17 May 2005
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2005. Report on Dieng Volcanic Complex (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 11 May-17 May 2005. 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)
A pilot reported a plume from Dieng at 1029 on 13 May to about 3 km altitude (10,000 feet). Ash was not identified in satellite imagery a little more than an hour later.
[Following the original posting of this report, the Darwin VAAC provided the additional information that Indonesian aviation authorities and the Volcanological Survey of Indonesia (DVGHM) quickly confirmed on that day that the plume was not due to an eruption, but due to pipe maintenance at the geothermal energy site at Dieng. The original posting also incorrectly identified the Indonesian DVGHM as the source of the report, when it was actually a Volcanic Ash Advisory from the Darwin VAAC. The prompt follow-up by local authorities and correction of the original report is greatly appreciated.]
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.