Report on Sangeang Api (Indonesia) — 12 July-18 July 2017
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 12 July-18 July 2017
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2017. Report on Sangeang Api (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 12 July-18 July 2017. Smithsonian Institution and US Geological Survey.
8.2°S, 119.07°E; summit elev. 1912 m
All times are local (unless otherwise noted)
PVMBG reported a small eruption at Sangeang Api at 1154 on 15 July characterized by Strombolian activity, and an ash plume that rose 100-200 m above the crater rim and drifted SW. Prior to the event, thermal anomalies had increased beginning in March, and seismicity had increased starting in April.
Based on analyses of satellite imagery, PVMBG observations, and wind data, the Darwin VAAC reported that on 16 July an ash plume rose to an altitude of 2.1 km (7,000 ft) a.s.l., or 200 m above the crater rim, and drifted NW.
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.