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.

Geological Summary. 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 eruptions have been recorded since 1512, most of them during in the 20th century.

Information Contacts: VSI.