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Report on Soputan (Indonesia) — November 2003


Bulletin of the Global Volcanism Network, vol. 28, no. 11 (November 2003)
Managing Editor: Edward Venzke.

Soputan (Indonesia) Avalanche earthquakes and small white gas plumes

Please cite this report as:

Global Volcanism Program, 2003. Report on Soputan (Indonesia) (Venzke, E., ed.). Bulletin of the Global Volcanism Network, 28:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200311-266030



1.112°N, 124.737°E; summit elev. 1785 m

All times are local (unless otherwise noted)

Seismic activity recorded at Soputan during November was dominated by avalanche earthquakes (table 5). Frequent ash explosions occurred during July and on 31 August, when a lava flow was also seen (BGVN 28:08). Only a white gas plume reaching heights of 25-50 m was observed during 27 October-30 November. The hazard status of the volcano remained at Alert Level 2 (on a scale of 1-4).

Table 5. Seismicity at Soputan, 27 October-30 November 2003. Courtesy of VSI.

Date Avalanche Earthquakes Tectonic Earthquakes
27 Oct-02 Nov 2003 51 5
03 Nov-09 Nov 2003 35 18
10 Nov-16 Nov 2003 24 17
17 Nov-23 Nov 2003 37 7
24 Nov-30 Nov 2003 66 10

Geological Summary. The Soputan stratovolcano on the southern rim of the Quaternary Tondano caldera on the northern arm of Sulawesi Island is one of Sulawesi's most active volcanoes. The youthful, largely unvegetated volcano is the only active cone in the Sempu-Soputan volcanic complex, which includes the Soputan caldera, Rindengan, and Manimporok (3.5 km ESE). Kawah Masem maar was formed in the W part of the caldera and contains a crater lake; sulfur has been extracted from fumarolic areas in the maar since 1938. Recent eruptions have originated at both the summit crater and Aeseput, a prominent NE-flank vent that formed in 1906 and was the source of intermittent major lava flows until 1924.

Information Contacts: Dali Ahmad, Hetty Triastuty, Nia Haerani, and Suswati, Volcanological Survey of Indonesia (VSI), Jalan Diponegoro No. 57, Bandung 40122, Indonesia (URL: http://www.vsi.esdm.go.id/).