The Darwin VAAC reported that during 24-30 July multiple ash plumes from Sangeang Api were identified by pilots and in satellite images rising to 2.4-3 km (8,000-10,000 ft) a.s.l. and quickly dissipating N, NW, W, and SW. The Alert Level remained at 2 (on a scale of 1-4).

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.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)