Report on Dieng Volcanic Complex (Indonesia) — May 2002
Bulletin of the Global Volcanism Network, vol. 27, no. 5 (May 2002)
Managing Editor: Richard Wunderman.
Dieng Volcanic Complex (Indonesia) Increase in seismicity and plume emission beginning in April 2002
Please cite this report as:
Global Volcanism Program, 2002. Report on Dieng Volcanic Complex (Indonesia) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 27:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200205-263200.
Dieng Volcanic Complex
7.2°S, 109.879°E; summit elev. 2565 m
All times are local (unless otherwise noted)
The last reported activity at Dieng occurred during late June and early July 1998, when three M ~2 earthquakes were felt and a white steam plume was emitted from Sileri crater to a height of 50 m (BGVN 23:08). During April 2002, the Volcanological Survey of Indonesia (VSI) reported that activity at Dieng increased. Beginning on 19 April the number of deep and shallow volcanic earthquakes increased (table 1), and a white plume of variable thickness rose 25-50 m above Sileri crater. The temperatures of fumaroles in various craters were 50-95°C (table 2). Dieng remained at Alert Level 2 through at least 26 May 2002.
|Date||Deep volcanic (A-type)||Shallow volcanic (B-type)||Far Tectonic||Local Tectonic|
|15 Apr-21 Apr 2002||14||10||1||0|
|22 Apr-28 Apr 2002||75||121||1||1|
|29 Apr-05 May 2002||18||64||0||0|
|06 May-12 May 2002||6||82||0||0|
|13 May-19 May 2002||2||24||1||0|
|15 Apr-21 Apr 2002||90-94°C||91-94°C||68°C||90-93°C||70-74°C||90-94°C||--||--|
|22 Apr-28 Apr 2002||91-95°C||92-94°C||69°C||--||76-75°C||--||50-57°C||90-94°C|
|29 Apr-05 May 2002||--||--||--||90-93°C||74-75°C||--||--||--|
|06 May-12 May 2002||--||--||69°C||--||--||--||50-56°C||--|
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.
Information Contacts: Dali Ahmad, Volcanological Survey of Indonesia (VSI), Jalan Diponegoro No. 57, Bandung 40122, Indonesia (URL: http://www.vsi.esdm.go.id/).