Activity of Sheveluch, Rincon de la Vieja and Ruapehu.

The explosive-extrusive eruption continues at Sheveluch, with a plume that ash that rose this April 10 to about 10; 100 meters asl. / flight altitude 330, before traveling 55 km in a southerly direction.

Sources: IVS & VAAC Tokyo

In its latest report, RSN / Costa Rica mentions three seismic signals associated with phreatic eruptive activity at Rincon de La Vieja, respectively on April 3 at 2:35 pm, April 5 at 8:36 pm and April 7th at 8:47 am.

The most energetic eruption was on April 3, which caused lahars on the northern flank.

The RSN advises against approaching the Rincon de La Vieja in case of eruption: the danger of the primary lahar remains a significant danger, and in case of rain, secondary lahars can occur by remobilization of ash accumulated in the high parts by previous eruptions.

The seismicity of the week is characterized by LP earthquakes, tornillos and a VT earthquake, in addition to the eruptive earthquakes mentioned above.

Source: Red Sismologica Nacional

In New Zealand, the GNS reports an increase in the temperature of the Te Wai crater lake at Ruapehu, associated with moderate level volcanic tremor.

After six months at a temperature of about 30 °C, the measurements show an increase, at the rate of 0.5 °C per day, reaching 42 °C on April 9.

The historical context shows that only 1% of post-2009 temperatures exceeded 42 °C; the Ruapehu eruptions occurred most often when the lake temperature exceeded 45 °C, although in 2016, the temperature was recorded at 46 °C, without eruption.

The alert level of the volcano remains at 1 / minor instability. The last eruption of Ruapehu dates from September 2007.

Source: GNS

This video schematically recalls the last eruption of Anak Krakatau and the associated tsunami, December 22, 2018