Merapi volcano (Central Java, Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 6 January-12 January 2021 (New Activity / Unrest)

Wed, 6 Jan 2021, 06:00

06:00 AM | BY: VN

BPPTKG reported that a new lava dome, first observed on 4 January, continued to emerge just below Merapi's SW rim during 5-12 January. Incandescent avalanches were observed 19 times during 4-7 January with material traveling as far as 800 m down the Krasak River drainage on the SW flank. At 0802 on 7 January a block-and-ash flow traveled down the upper part of the Krasak; the total distance was not observable due to weather clouds, though the seismic data suggested it was small and was not more than 1 km in length.
The event also produced a 200-m-high ash plume. Similar events were recorded that same day at 1250, 1315, and 1402. Deformation continued; electronic Distance Measurement (EDM) data continued to measure a distance shortening between points in the NW at a rate of 15 cm per day.
On 7 January BNPB noted that 1,342 residents were housed in evacuation centers. 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.

Sources: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG), Badan Nacional Penanggulangan Bencana (BNPB)
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From: Global Volcanism Program, 2021. Report on Merapi. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 6 January-12 January 2021. Smithsonian Institution and US Geological Survey.

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