Report on Marapi (Indonesia) — 1 March-7 March 2023
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 1 March-7 March 2023
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2023. Report on Marapi (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 1 March-7 March 2023. Smithsonian Institution and US Geological Survey.
0.38°S, 100.474°E; summit elev. 2885 m
All times are local (unless otherwise noted)
PVMBG reported that the eruption at Marapi (on Sumatra) continued during 1-7 March. On 2 March white steam-and-gas plumes rose 100 m from the summit and drifted NW, SW, and E, and on 4 March white-and-gray plumes rose 200 m and drifted N and NE; weather clouds prevented visual observations on the other days. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 3 km away from the crater.
Geological Summary. 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.