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Report on Slamet (Indonesia) — 8 April-14 April 2015

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 8 April-14 April 2015
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2015. Report on Slamet (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 8 April-14 April 2015. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (8 April-14 April 2015)


Slamet

Indonesia

7.242°S, 109.208°E; summit elev. 3428 m

All times are local (unless otherwise noted)


PVMBG reported that during 1 February-10 April dense white plumes rose 50-800 m above Slamet's crater. Seismicity consisted of emission signals and tremor; emission signals started to increase on 18 February and periods of continuous tremor were recorded during 21-22 and 28-29 March. RSAM values fluctuated but rose overall. The Alert Level remained at 2 (on a scale of 1-4). Residents and tourists were warned to not approach the crater within a radius of 2 km.

Geologic Background. Slamet, Java's second highest volcano at 3428 m and one of its most active, has a cluster of about three dozen cinder cones on its lower SE-NE flanks and a single cinder cone on the western 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. Historical 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)