Activity of Sinabung, Villarica, Sabancaya and Grimsey / TFZ.

Back on the strong eruption of Sinabung yesterday 19 February:

After the abrupt eruption that lasted over 607 seconds, the eruptive plume is mounted according to observers at a height between 5,000 and 7,000 meters, do not reach the stratosphere, and the first estimates of the sulfur dioxide flux produced are too low for have significant atmospheric effects ... despite its impressive size, the eruption will not have a climatic impact (E.Klemetti / Rocky planet)

The ashes of the volcano dispersed yesterday to the north of Sumatra, rather than to the west as one would expect according to the direction of the winds, and for more than 100 km.

Significant pyroclastic flows, which obscured the horizon, appear to have been generated by both the collapse of the eruptive column, and based on the photos of the dome before and after the eruption, by its almost complete annihilation. The summit area was impacted by the direct fallout of ash.

Various satellite images describe the ash heights and concentrations in the ash cloud emitted.
 

Sources: PVMBG, Magma Indonesia, BNPB, Rocky Planet

In Villarica / Chile, the lava lake resumed its rise in its well after a six-week period of low activity and subsidence.

Source: POVI

The week of activity from February 12 to 18 in Sabancaya / Peru is similar to the previous one, characterized by an average of 19 explosions per day, plumes of ash and gas rising to a maximum of 2,500 meters above the crater, and the predominance of LP earthquakes, associated with fluid motions, and emission tremors.

The flow of sulfur dioxide remains high, with 9,270 tons / day on February 15, which can cause acid rain in areas near the volcano.

Alert level remains orange

Sources: IG Peru / OVI / Ingemmet

The people of Iceland's Grimsey Island have had a bad night ... in the last 48 hours, 1,536 earthquakes have been detected, including an episode of magnitude 5.2 and another of M 4.5. , felt on a large area in the north of Iceland.

This large seismic swarm marks the oblique rift zone of Grimsey, and the submarine volcanic system of Nafir.

No deformation is observed by nearby GPS stations, which may indicate a magmatic intrusion. This parameter and the depth of the earthquakes suggest a tectonic process marking the edge of divergent plates.

Sources: IMO & Institute of Earth Science