Report on Soputan (Indonesia) — 30 July-5 August 2003
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 30 July-5 August 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, 30 July-5 August 2003. Smithsonian Institution and US Geological Survey.
1.112°N, 124.737°E; summit elev. 1785 m
All times are local (unless otherwise noted)
Activity decreased at Soputan after an eruption occurred on 18 July. During 21-25 July, incandescent lava on the volcano's W slope gradually cooled and on 22 July volcanic tremor stopped. Ash explosions sporadically occurred, but their density and maximum height decreased. Small-amplitude tremor was continuously recorded. As of 25 July the Alert Level at Soputan was at 2 (on a scale of 1-4).
Geologic Background. 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 rises to 1784 m and is located SW of Riendengan-Sempu, which some workers have included with Soputan and Manimporok (3.5 km ESE) as a volcanic complex. It was constructed at the southern end of a SSW-NNE trending line of vents. During historical time the locus of eruptions has included 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.