Report on Tangkubanparahu (Indonesia) — 19 September-25 September 2012
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 19 September-25 September 2012
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2012. Report on Tangkubanparahu (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 19 September-25 September 2012. Smithsonian Institution and US Geological Survey.
6.77°S, 107.6°E; summit elev. 2084 m
All times are local (unless otherwise noted)
CVGHM reported that during 23 August-21 September shallow volcanic earthquakes continued to be recorded at Tangkubanparahu but were less frequent. Other types of seismic signals also decreased. Based on seismicity, visual observations, deformation data, gas measurements, and soil and crater lake water temperatures, the Alert Level was lowered to 1 (on a scale of 1-4) on 21 September.
Geologic Background. Tangkubanparahu (also known as Tangkuban Perahu) is a broad shield-like stratovolcano overlooking Indonesia's former capital city of Bandung. The volcano was constructed within the 6 x 8 km Pleistocene Sunda caldera, which formed about 190,000 years ago. The volcano's low profile is the subject of legends referring to the mountain of the "upturned boat." The rim of Sunda caldera forms a prominent ridge on the western side; elsewhere the caldera rim is largely buried by deposits of Tangkubanparahu volcano. The dominantly small phreatic historical eruptions recorded since the 19th century have originated from several nested craters within an elliptical 1 x 1.5 km summit depression.