Report on Soputan (Indonesia) — 3 September-9 September 2003
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
3 September-9 September 2003
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2003. Report on Soputan (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 3 September-9 September 2003. Smithsonian Institution and US Geological Survey.
1.112°N, 124.737°E; summit elev. 1785 m
All times are local (unless otherwise noted)
An ash emission from Soputan on 4 September produced a cloud that rose to ~3 km a.s.l., extended ~75 km N of the summit, and was visible on satellite imagery. Soputan was at Alert Level 2 (on a scale of 1-4).
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.