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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: VN
BPPTKG reported that the “2021 lava dome” continued to emerge just below Merapi's SW rim during 8-14 January, producing a total of 128 incandescent lava avalanches that traveled as far as 900 m down the Krasak River drainage on the SW flank. A comparison of photos taken on 7 and 14 January showed that the morphological changes in the summit area were attributed to the emergence of new lava domes. The 2021 dome volume was an estimated 46,766 cubic meters on 14 January, with a growth rate of about 8,500 cubic meters per day.
Deformation 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.

Previous news

Fri, 8 Jan 2021, 19:32
Glow at the summit crater associated with incandescent avalanches at Merapi volcano (image: @OysteinVolcano/twitter)
The activity of the volcano continues at elevated levels. ... Read all
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