Saturday, Dec 31, 2011
Increased seismicity from Sorik Marapi was detected during 1-12 December and white plumes rose 40-50 m above the summit. CVGHM raised the Alert Level on 12 December from 1 to 2 (on a scale of 1-4) and back to 1 (normal) on 30 December 2011. [more]
Tuesday, Dec 13, 2011
A seismic swarm was detected at Sorik Marapi volcano in Sumatra and the alert level was raised to 2 (out of 4). 43 volcanic earthquakes were recorded on 12 December. ... [more]
Sorikmarapi 火山Sorikmarapi is a forested stratovolcano with a 600-m-wide summit crater containing a crater lake and substantial sulfur deposits.
Background:A smaller parasitic crater (Danau Merah) on the upper SE flank also contains a crater lake; these two craters and a series of smaller explosion pits occur along a NW-SE line. Several solfatara fields are located on the eastern flank. Phreatic eruptions have occurred from summit and flank vents during the 19th and 20th centuries.
Source: GVP, Smithsonian Institute