Report on Dieng Volcanic Complex (Indonesia) — July 2003
Bulletin of the Global Volcanism Network, vol. 28, no. 7 (July 2003)
Managing Editor: Edward Venzke.
Dieng Volcanic Complex (Indonesia) Mud bubbling and outflows at Sileri crater that reached 50 m beyond crater rim
Please cite this report as:
Global Volcanism Program, 2003. Report on Dieng Volcanic Complex (Indonesia). In: Venzke, E (ed.), Bulletin of the Global Volcanism Network, 28:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200307-263200.
Dieng Volcanic Complex
7.2°S, 109.879°E; summit elev. 2565 m
All times are local (unless otherwise noted)
According to the Volcanological Survey of Indonesia (VSI), on 20 July 2003 mud poured from Sileri crater. The crater contains a lake and boiling mud pots, and has been the site of small-to-moderate historical eruptions. The incident of 20 July occurred at night and sent mud as far as 25 m S of the crater rim. On 21 July, a temperature measurement of the crater recorded 74°C, no striking increase from earlier measurements.
On the morning of 24 July, another mud outpouring from the crater covered an area up to 50 m N and E of the crater rim. Activity then continued with small areas of mud bubbling and ejecta thrown 1 m high at the middle of the crater. Neither of the mud-outpouring events were recorded on the seismometer 1.1 km S of the crater. The volcano's hazard status was raised to level 2 on 22 July.
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/).