Report on Guntur (Indonesia) — 28 August-3 September 2013
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 28 August-3 September 2013
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2013. Report on Guntur (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 28 August-3 September 2013. Smithsonian Institution and US Geological Survey.
7.143°S, 107.84°E; summit elev. 2249 m
All times are local (unless otherwise noted)
CVGHM reported that the number of deep and shallow volcanic earthquakes at Guntur increased during 15-21 August; seismicity declined after that period. On 30 August at 0820 seismicity again increased, characterized by continuous tremor that lasted until 1450. At 1600 CVGHM raised the Alert Level to 2 (on a scale of 1-4) and reminded residents and visitors not to approach the active crater within a 2-km radius.
Geologic Background. Guntur is a complex of several overlapping stratovolcanoes about 10 km NW of the city of Garut in western Java. Young lava flows, the most recent of which was erupted in 1840, are visible on the flanks of the erosionally unmodified Gunung Guntur, which rises about 1550 m above the plain of Garut. It is one of a group of younger cones constructed to the SW of an older eroded group of volcanoes at the NE end of the complex. Guntur, whose name means "thunder," is the only historically active center, with eruptions having been recorded since the late-17th century. Although it has produced frequent explosive eruptions in the 19th century, making it one of the most active volcanoes of western Java, it has not erupted since.