Merapi volcano (Central Java, Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 13 January-19 January 2021 (New Activity / Unrest)
Wed, 13 Jan 2021, 06:00
06:00 AM | BY: VNDeformation continued, though at a lower rate; Electronic Distance Measurement (EDM) data showed a distance shortening between points in the NW at a rate of 6 cm per day. Seismic activity significantly decreased compared to the previous week.
At around 0400 on 16 January a pyroclastic flow descended 1.5 km down the Krasak drainage and produced an ash plume that rose 500 m. A pyroclastic flow was visible in webcam images around 1700 on 16 January, though somewhat obscured due to weather clouds, and traveled an estimated 1 km. From 1800 on 16 January to 0600 on 17 January there were a total of 56 incandescent lava avalanches that went a maximum distance of 1.5 km SW.
During the first six hours of 18 January six incandescent avalanches descended 600 m SW. At 0543 a pyroclastic flow traveled about 1 km down the Krasak drainage and produced an ash plume that rose 50 m above the summit and drifted SE. The Alert Level remained at 3 (on a scale of 1-4), and the public were warned to stay 5 km away from the summit.
Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)
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From: Global Volcanism Program, 2021. Report on Merapi. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 13 January-19 January 2021. Smithsonian Institution and US Geological Survey.
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