Report on Marapi (Indonesia) — 2 May-8 May 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 2 May-8 May 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Marapi (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 2 May-8 May 2001. Smithsonian Institution and US Geological Survey.
0.381°S, 100.473°E; summit elev. 2891 m
All times are local (unless otherwise noted)
VSI reported that volcanic activity continued at Marapi at a decreased level in comparison to the previous week. Thirty explosions were observed and an ash plume rose 3 km above the summit. Tephra fell up to 4 km in radius from the crater. Marapi remained at Alert Level 2 (on a scale of 1-4).
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.