Report on Sangeang Api (Indonesia) — 3 June-9 June 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 3 June-9 June 2009
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2009. Report on Sangeang Api (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 3 June-9 June 2009. Smithsonian Institution and US Geological Survey.
8.2°S, 119.07°E; summit elev. 1912 m
All times are local (unless otherwise noted)
CVGHM reported that on 4 June the Alert Level for Sangeang Api was raised to 2 (on a scale of 1-4) due to recent increases in the number of earthquakes. White plumes rose 5-25 m during 1 May-3 June.
Geologic Background. Sangeang Api volcano, one of the most active in the Lesser Sunda Islands, forms a small 13-km-wide island off the NE coast of Sumbawa Island. Two large trachybasaltic-to-tranchyandesitic volcanic cones, Doro Api and Doro Mantoi, were constructed in the center and on the eastern rim, respectively, of an older, largely obscured caldera. Flank vents occur on the south side of Doro Mantoi and near the northern coast. Intermittent historical eruptions have been recorded since 1512, most of them during in the 20th century.