Marapi volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 27 July-2 August 2011 (New Activity / Unrest)

Wed, 27 Jul 2011, 06:00
06:00 AM | BY: VN
CVGHM reported increased seismicity from Marapi during 21 June-3 August. Observers noted that during June and July white plumes rose 15-75 m above the summit craters. On 1 August white plumes rose 15 m above the main crater; fog prevented observations the next day.
On 3 August dense gray plumes rose 300-1,000 m above the crater on eight occasions. That same day CVGHM raised the Alert Level to 2 (on a scale of 1-4). Visitors and residents were prohibited from going within a 3-km radius of the summit.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
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From: Global Volcanism Program, 2011. Report on Marapi. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 27 July-2 August 2011. Smithsonian Institution and US Geological Survey.

Previous news

Wed, 20 Jul 2005, 06:00
DVGHM raised the Alert Level at Marapi from 1 to 2 on 18 July after the number of earthquakes increased dramatically during 8-14 July. During this period, the volcano's seismic network recorded 112 deep volcanic earthquakes. Normally, an average of 7 deep volcanic earthquakes occur in 1 week. ... Read all
Wed, 4 Aug 2004, 06:00
Increased volcanic activity at Marapi during early August led DVGHM to raise the Alert Level to 2 from 1 (on a scale of 1-4) on 5 August. Ash explosions rose 500-1,000 m above the summit and no seismic data were available. Visitors and villagers in the Tanah Datar and Padang Panjang districts were advised not to climb the volcano. ... Read all
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