Krakatau volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 28 September-4 October 2011 (New Activity / Unrest)
Wed, 28 Sep 2011, 06:00 06:00 AM | BY: VNCVGHM reported that seismicity from Anak Krakatau in 2011, as late as 10 July, consisted of 20-30 volcanic-earthquake events per day and shallow events ranged from 120 to 135 events per day. Hundreds of events per day were detected during swarms. On 10 July, the seismic equipment was damaged by Krakatau's activity but was again operational in mid-September.
During 18-30 September seismic events reached 4-5 events per minute. Visual observations in 2011 until 13 September indicated occasional explosive eruptions that would eject material and produce ash plumes. During 14-30 September fumarolic activity from the crater and in the fumarolic fields was visible.
The Alert Level was increased to 3 (on a scale of 1-4) on 30 September based on an increase in seismic activity and widespread fumarolic activity.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
From: Global Volcanism Program, 2011. Report on Krakatau. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 28 September-4 October 2011. Smithsonian Institution and US Geological Survey.
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