PVMBG reported that seismicity at Slamet increased during 1-10 March, particularly during 8-10 March. Observers at a post in Slamet Gambuhan village, about 10 km away, noted that diffuse to dense white plumes rose as high as 600 m above the crater during 1-7 March, and as high as 1 km during 8-10 March. The Alert Level was raised to 2 (on a scale of 1-4) on 10 March; visitors and tourists were advised not to approach the crater within a radius of 2 km.

Geological Summary. Slamet is one of Java's most active volcanoes. It has a cluster of about three dozen cinder cones on its lower SE-NE flanks and a single cinder cone on the W flank. It is composed of two overlapping edifices, an older basaltic andesite to andesitic volcano on the west and a younger basaltic to basaltic andesite one on the east. Gunung Malang II cinder cone on the upper E flank on the younger edifice fed a lava flow that extends 6 km E. Four craters occur at the summit of Gunung Slamet, with activity migrating to the SW over time. Eruptions recorded since the 18th century have originated from a 150-m-deep, 450-m-wide, steep-walled crater at the western part of the summit and have consisted of explosive eruptions generally lasting a few days to a few weeks.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)