During the past week, Nevado del Ruiz has experienced various episodes of explosive ash emissions, with plumes of variable height, between 230 and 1,300 meters; these emissions were concomitant with pulsatile tremor and LP low energy earthquakes.
Most of the ash has been dispersed to the north-west and south-east of the volcano, and further falls of ash are expected.
The level of activity is maintained at 3-yellow / behavioral changes of volcanic activity.
Source: Servicio Geologico Colombiano / 18,04,2019
In the past few weeks, we can observe at Etna thermal anomalies that remain low, between 1 and 4 MW, corroborated by the satellite images of the hot spots at the summit.
They correspond to the Bocca Nuova and the eastern mouth of the NSEC.
" Magma is reoccupying the central ducts, very similar to what was observed last summer ", commented Boris Behncke.
Sources: Boris Behncke, Mirova and Sentinel 2
In the Aeolian Islands, Stromboli exhibits activity that fluctuates between low and moderate levels, with explosions averaging a few minutes apart from various vents on the crater terrace.
Most occur at the northeastern vent and the westernmost vent, which eject incandescent materials at 80 - 150 m. above. The westernmost vent has strombolian explosions rich in ash.
Mirova reports low to moderate thermal anomalies on April 19 and 20, VRP between 2 and 23 MW
Sources: Volcanodiscovery, Mirova and Sentinel 2