Report on Sumbing (Indonesia) — 30 July-5 August 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 30 July-5 August 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Sumbing (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 30 July-5 August 2008. Smithsonian Institution and US Geological Survey.
7.384°S, 110.07°E; summit elev. 3371 m
All times are local (unless otherwise noted)
Based on pilot observations, the Darwin VAAC reported that an eruption plume from Sumbing rose to an altitude of 4.9 km (16,000 ft) a.s.l. and drifted W. Ash was not identified on satellite imagery. [Correction: CVGHM later confirmed that Sumbing did not erupt on 1 August and attributed the plume origin to either a different volcano or a bushfire that was reported in the area.]
Geologic Background. Gunung Sumbing is a prominent 3371-m-high stratovolcano that lies across a 1400-m-high saddle from symmetrical Sundoro volcano in central Java. Prominent cones are located on the N and SE flanks, which is somewhat more dissected than Sundoro. An 800-m-wide horseshoe-shaped summit crater breached to the NE is partially filled by a lava dome that fed a lava flow down to 2400 m elevation. Emplacement of the dome followed the eruption of extensive pyroclastic flows down the NE flank. The only report of historical activity, in about 1730 CE, may have produced the small phreatic craters found at the summit.