Report on Semeru (Indonesia) — 4 March-10 March 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
4 March-10 March 2009
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2009. Report on Semeru (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 4 March-10 March 2009. Smithsonian Institution and US Geological Survey.
8.108°S, 112.922°E; summit elev. 3657 m
All times are local (unless otherwise noted)
On 6 March, CVGHM reported that an ash eruption from Semeru was characterized by increased seismicity and booming sounds from the Jonggring Seloko crater; fog prevented visual observations. The Alert Level was raised to 3 (on a scale of 1-4). Based on analysis of satellite imagery, the Darwin VAAC reported that on 7 March a possible plume rose to altitudes of 3.7-4.3 km (12,000-14,000 ft) a.s.l.
Geological Summary. Semeru, the highest volcano on Java, and one of its most active, lies at the southern end of a volcanic massif extending north to the Tengger caldera. The steep-sided volcano, also referred to as Mahameru (Great Mountain), rises above coastal plains to the south. Gunung Semeru was constructed south of the overlapping Ajek-ajek and Jambangan calderas. A line of lake-filled maars was constructed along a N-S trend cutting through the summit, and cinder cones and lava domes occupy the eastern and NE flanks. Summit topography is complicated by the shifting of craters from NW to SE. Frequent 19th and 20th century eruptions were dominated by small-to-moderate explosions from the summit crater, with occasional lava flows and larger explosive eruptions accompanied by pyroclastic flows that have reached the lower flanks of the volcano.