Report on Marapi (Indonesia) — November 1984
Scientific Event Alert Network Bulletin, vol. 9, no. 11 (November 1984)
Managing Editor: Lindsay McClelland.
Marapi (Indonesia) Small plumes
Please cite this report as:
Global Volcanism Program, 1984. Report on Marapi (Indonesia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 9:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198411-261140.
0.38°S, 100.474°E; summit elev. 2885 m
All times are local (unless otherwise noted)
On 15 November at 0500 Marapi emitted a white to brownish plume. A small, possibly phreatic, eruption occurred at 0830, ejecting a blackish plume to about 400 m height. No additional activity was reported. No residents were evacuated.
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 2000 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.
Information Contacts: A. Sudradjat, VSI.