Report on Sangeang Api (Indonesia) — October 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 10 (October 1987)
Managing Editor: Lindsay McClelland.
Sangeang Api (Indonesia) Fewer explosions
Please cite this report as:
Global Volcanism Program, 1987. Report on Sangeang Api (Indonesia) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 12:10. Smithsonian Institution.
8.2°S, 119.07°E; summit elev. 1912 m
All times are local (unless otherwise noted)
Eruptive activity continued in October at a rate of ~18 explosions/day, with plumes reaching ~600 m above the crater rim. The number of daily explosions has declined steadily from 50-70/day in early 1987, and the October rate is the lowest since the eruption started in July 1985.
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.
Information Contacts: VSI.