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Report on Sorikmarapi (Indonesia) — July 1989


Scientific Event Alert Network Bulletin, vol. 14, no. 7 (July 1989)
Managing Editor: Lindsay McClelland.

Sorikmarapi (Indonesia) Thermal activity; no shallow seismicity

Please cite this report as:

Global Volcanism Program, 1989. Report on Sorikmarapi (Indonesia) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 14:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198907-261120



0.686°N, 99.539°E; summit elev. 2145 m

All times are local (unless otherwise noted)

Normal activity continued in late July, with a weak gas plume reaching 5-10 m above the crater. The temperature of the crater solfatara was 185-190°C, while two surrounding solfataric areas measured 108-110°C and 97-115°C. Twenty-nine tectonic earthquakes (but no volcanic shocks) were recorded.

Geological Summary. Sorikmarapi is a forested stratovolcano with a 600-m-wide summit crater containing a lake and substantial sulfur deposits. A smaller upper SE flank crater (Danau Merah) also contains a crater lake; these two craters and a series of smaller explosion pits occur along a NW-SE line. Several solfatara fields are located on the E flank. Phreatic eruptions have occurred from summit and flank vents during the 19th and 20th centuries.

Information Contacts: VSI.