March eruptive activity consisted of ~250 small gas explosions with plumes reaching a maximum height of 600 m above the crater rim. Of the 22 earthquakes recorded during March, 17 were of tectonic origin (deep) and five were volcanic (shallow).

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; T. Casadevall, USGS & VSI.