Activity of Sinabung, Merapi and Klyuchevskoy.

An eruptive episode marked the Sinabung on Friday January 8, 2021 at 6:09 p.m. WIB, accompanied by an ash plume observed at ± 700 m above the summit (± 3160 m above sea level) drifting north . This eruption was recorded on a seismograph with a maximum amplitude of 34 mm and a duration of 161 seconds.

Another episode occurred on Friday January 8, 2021 at 11:04 p.m. WIB. No visual rash was observed. This eruption was recorded on a seismograph with a maximum amplitude of 36 mm and a duration of 200 seconds.

Seismic observation of January 8, 2021:

- 2 eruption earthquakes with an amplitude of 34-36 mm and the duration of the earthquake of 161-200 seconds.

- 44 collapse / avalanche earthquakes with an amplitude of 2 to 50 mm and an earthquake duration of 20 to 145 seconds.

- 14 blast / emission earthquakes, with an amplitude of 2 to 60 mm, and the earthquake lasted 15 to 75 seconds.

- 5 low frequency earthquakes with an amplitude of 4 to 24 mm and the duration of the earthquake was 10 to 45 seconds.

- 14 hybrid / multiphase earthquakes, with an amplitude of 2-7 mm, S-P was not observed and the earthquake took 5-12 seconds.

- 1 local tectonic earthquake

- 6 distant tectonic earthquakes

Since 28,12,2020, the eruptions become more frequent.

On Saturday January 9, 2021, at 5:35 am WIB, PVMBG reports an eruption, accompanied by an ash plume observed at ± 1000 m above the summit (± 3460 m above sea level) dispersed to the north and the northeast. This eruption was recorded on a seismograph with a maximum amplitude of 70 mm and a duration of 118 seconds.

Sources: PVMBG, Magma Indonesia

A fall of glowing rocks on the southwest flank of Merapi volcano is observed at 11:32 p.m. local time on January 8.

At the seismicity level for this January 8, 2021, it is reported:

- 149 collapse / avalanche earthquakes, with an amplitude of 3-50 mm and a duration of 11.2-113 seconds from the earthquake.

- 36 blast / emission earthquakes, with an amplitude of 3 to 23 mm and the duration of the earthquake was 9.3 to 36.8 seconds.

- 199 hybrid / multiphase earthquakes with an amplitude of 3-30 mm, S-P 0.3-0.5 seconds and the duration of the earthquake was 4.7-11.2 seconds.

- 56 shallow volcanic earthquakes with an amplitude of 35 to 75 mm, and the duration of the earthquake was 11 to 44.5 seconds.

- 4 distant tectonic earthquakes, with an amplitude of 3-8 mm, S-P was not observed and the earthquake lasted 67.9-110.6 seconds.

A pyroclastic flow occurred on January 9, 2021 at 08:45 WIB at Merapi. The eruptive column was observed up to 200m high; the descent of the pyroclastic flow upstream of Kali Krasak was 600m, recorded on the seismogram with a max. 45 mm and a duration of 120 seconds.

Sources: PVMBG, Magma Indonesia

The explosive-effusive eruption continues this week at Klyuchevskoy.

KVERT mentions the observation of Strombolian to Vulcanian activity, accompanied by plumes of gas, steam and ash, throughout the week, at more than 6,000 meters in height, and extending up to 70 km from the volcano.

A lava flow continues to move into Kozyrevsku chute on the southern flank, characterized by a strong thermal anomaly.

Aviation code remains orange, other ash explosions may affect air traffic

Source: KVERT