Report on Marapi (Indonesia) — December 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 12 (December 1987)
Managing Editor: Lindsay McClelland.
Marapi (Indonesia) Many small explosions; light ashfall over W part of island
Please cite this report as:
Global Volcanism Program, 1987. Report on Marapi (Indonesia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 12:12. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.SEAN198712-261140.
0.381°S, 100.473°E; summit elev. 2891 m
All times are local (unless otherwise noted)
At least 17 small explosions were recorded during December. One of the largest, on 7 December at 0648, sent a plume from the summit area's Verbeek Crater to ~900 m height. Additional larger explosions occurred on 24 December at 0625 (plume to 1,000 m) and on 27 December at 0007 (plume not visible). Other plumes from December explosions reached 700-1,000 m above the crater. Light ashfall was reported from a wide area of W Sumatra.
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: VSI.