Report on Ranakah (Indonesia) — 24 August-30 August 2011
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 24 August-30 August 2011
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2011. Report on Ranakah (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 24 August-30 August 2011. Smithsonian Institution and US Geological Survey.
8.637°S, 120.5302°E; summit elev. 2288 m
All times are local (unless otherwise noted)
CVGHM reported that observers of Anak Ranakah, a lava dome that formed in 1987 at the base of the large older lava dome of Ranakah, noted white plumes rising up to 10 m high during January-24 August. Seismicity initially increased in December 2010, but increased again during June-August. Based on visual observations and seismic data analyses, CVGHM raised the Alert Level to 2 (on a scale of 1-4) on 26 August.
Geological Summary. The Anak Ranakah (Child of Ranakah) lava dome was formed in 1987 in an area without previous recorded eruptions at the base of the large older lava dome of Gunung Ranakah. An arcuate group of lava domes extending about 12 km west from Gunung Ranakah to Poco Mandosawa occurs on the outer N flanks of the poorly known Poco Leok caldera on western Flores Island.