". . . By comparison with activity in December and January, the frequency of small explosions increased slightly during February and March to ~80/day [but see 11:1]. The height of the eruption clouds averaged ~900 m. Since December 1985, no visits have been made to examine the 1985 lava flow, but continued lava production is suspected."

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: Olas, A. Sudradjat, and T. Casadevall, VSI.