Report on Marapi (Indonesia) — 25 April-1 May 2018
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 25 April-1 May 2018
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2018. Report on Marapi (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 25 April-1 May 2018. Smithsonian Institution and US Geological Survey.
0.38°S, 100.474°E; summit elev. 2885 m
All times are local (unless otherwise noted)
On 27 April a phreatic eruption at Marapi produced an ash plumes that rose 300 m above the crater rim. The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were advised not to enter an area within 3 km of the summit.
Geologic Background. Gunung Marapi, not to be confused with the better-known Merapi volcano on Java, is Sumatra's most active volcano. This massive complex stratovolcano rises 2,000 m above the Bukittinggi Plain in the Padang Highlands. A broad summit contains multiple partially overlapping summit craters constructed within the small 1.4-km-wide Bancah caldera. The summit craters are located along an ENE-WSW line, with volcanism migrating to the west. More than 50 eruptions, typically consisting of small-to-moderate explosive activity, have been recorded since the end of the 18th century; no lava flows outside the summit craters have been reported in historical time.