Report on Soputan (Indonesia) — 14 January-20 January 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 14 January-20 January 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Soputan (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 14 January-20 January 2015. Smithsonian Institution and US Geological Survey.
1.112°N, 124.737°E; summit elev. 1785 m
All times are local (unless otherwise noted)
Based on a SIGMET, the Darwin VAAC reported that an ash plume from Soputan rose to an altitude of 5.5 km (18,000 ft) a.s.l. on 18 January. BNPB reported that an eruption at 1138 that same day generated an ash plume that rose 4 km and drifted SW; the report did not specify if 4 km was height above volcano or altitude a.s.l. Strombolian activity ejected material 500 m above the crater and incandescent avalanches of material traveled 500 m down the SW flank. The Alert Level was at 3 (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.