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Report on Marapi (Indonesia) — 20 May-26 May 2015


Marapi

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 20 May-26 May 2015
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2015. Report on Marapi (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 20 May-26 May 2015. Smithsonian Institution and US Geological Survey.

Weekly Report (20 May-26 May 2015)

Marapi

Indonesia

0.38°S, 100.474°E; summit elev. 2885 m

All times are local (unless otherwise noted)


PVMBG reported that during February-25 May diffuse white plumes rose as high as 300 m above Marapi, although inclement weather often prevented observations. Seismicity fluctuated. 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.

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.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)