Report on Soputan (Indonesia) — 8 December-14 December 2004
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 8 December-14 December 2004
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2004. Report on Soputan (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 8 December-14 December 2004. Smithsonian Institution and US Geological Survey.
1.112°N, 124.737°E; summit elev. 1785 m
All times are local (unless otherwise noted)
According to DVGHM, an eruption at Soputan on 12 December around 0050 produced an E-drifting ash cloud to ~1 km above the volcano. It was followed by a "hot cloud" that traveled about 200 m E and a lava flow that traveled SW. The eruption was preceded by an increase in tremor on 11 December and incandescence that was visible in the crater. DVGHM increased the Alert Level at Soputan to 2 (on a scale of 1-4). According to the Darwin VAAC an eruption cloud was visible on satellite imagery on 12 December at 0925 at a height of ~10.7 km a.s.l.
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.