Activity of Karymsky, Merapi, Villarica and seismic swarm in Reykjanes Peninsula.

According to data from AMC Elizovo (pilots), explosions from the Karymsky sent ash up to 4,000 m. altitude, around 02:30 UTC on October 21. The ash plume continues to drift south-east of the volcano for 40 km. The last Karymsky explosions were noted on July 29, 2020.

Moderate eruptive activity of the volcano continues. Ash explosions up to 19,700-23,000 feet (6-7 km) above sea level could occur at any time. Ongoing activities could affect low-flying planes.

The aviation code has changed to orange.

Sources: KVERT & VAAC Tokyo

Thanks to the seismographic recordings of October 20, 2020, it was recorded at Merapi, where the activity seems more intense:

- 28 earthquake collapse

- 37 blast earthquakes

- 27 low frequency earthquake

- 83 hybrid / multiphase earthquakes

- 18 shallow volcanic earthquakes

- 2 distant tectonic earthquakes.

The current potential danger is in the form of pyeoclastic flows associated with the collapse of the lava dome and the fall of volcanic material due to explosive eruptions.

Activity level remains at 2 / waspada, with a 3 km no-go zone from the summit.

Sources: PVMBG & BPPTKG

On October 20 at 5:22 p.m. local time, an LP earthquake occurred in Villarica, associated with a moderate explosion at the active crater, accompanied by an ash plume reaching 240 meters above the emission bridge.

No significant changes in seismicity, the volcanic technical alert remains at amarilla.

Source: Sernageomin

At 1:43 p.m. on October 20, an M5.6 earthquake occurred in Núpshlíðarháls, about 5 km west of the Seltún geothermal area on the Reykjanes peninsula.

The earthquake was felt widely across the country, particularly in the southern part of the Reykjanes peninsula and in the capital region, about 25 km from the epicenter.The earthquake was felt also in the Westman Islands and Borgarnes.

To date, more than 250 aftershocks have been detected, the most important of the period between 3:27 pm and 3:32 pm The most important was M4.1, the other earthquakes between 3.0 and 3.8 . There is no sign of volcanic unrest in the area.

Today's earthquake is the largest measured earthquake in the Reykjanes Peninsula since 2003.

"There is a long term active process underway in the region and we can expect that there will be more earthquakes in the coming hours that will make themselves felt all the way to the capital region. ", says Kristín Jónsdóttir, seismic risk coordinator at the Islandic Met Office, in an interview with RÚV today.

GPS measurements indicate that a slow landslide is taking place near Krýsuvík, according to Kristín Jónsdóttir. When asked about the next steps, she says an announcement has been received of an unusually strong smell of gas and Kristín believes that today's large earthquake "only took root in the geothermal system."

Sources: IMO, RUV, EMSC