Report on Sangeang Api (Indonesia) — 3 July-9 July 2019
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 3 July-9 July 2019
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2019. Report on Sangeang Api (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 3 July-9 July 2019. Smithsonian Institution and US Geological Survey.
8.2°S, 119.07°E; summit elev. 1912 m
All times are local (unless otherwise noted)
The Darwin VAAC reported that during 4-5 July ash plumes from Sangeang Api were visible in satellite images rising to 2.1-2.3 km (7,000-8,000 ft) a.s.l. and drifting SW and W. During 6-9 July multiple ash plumes rose to 3-4.6 km (10,000-15,000 ft) a.s.l. and drifted N, NW, and SW. Thermal anomalies were visible on 4 and 8 July.
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.