The eruptive activity at the new southeast crater of Etna on April 19 began around 06:30 UTC local 8:30 am with a sudden increase in the tremor, showing strombolian activity at the "saddle cone" of the NSEC; from 07:15 h UTC, it gradually evolved into a pulsating lava fountain.
Etna NSEC - 19.04.2020, respectively at 7.15 am and 7.21 am - INGV OE webcams - one click to enlarge
From 07:50 UTC, modest lava flows are observed at the top of the NSEC and remain confined to the upper eastern and southern flanks of the cone.
The activity generated the emission of an ash plume which was quite weak at the beginning and which gradually increased in intensity from 08:45 UTC, reaching around 5,000 meters in height. The ashes fell on the eastern side of the volcano for the most part in the Bove Valley and fallout of fine materials were also reported on the city of Zafferana.
The aviation code changed from orange to red at 7:24 am UTC.
Etna - evolution of the ash plume, on April 19, 2020 respectively at 9:45 am and 10:58 am - Skyline and LAVE webcam - one click to enlarge
From 09:55 UTC, the lava fountain activity gradually diminished until it stopped.
Finally, it is reported that strombolian activity at the crater of La Voragine, which started in September 2019. continues with slight fluctuations compared to what has been communicated so far.
From a seismic point of view, after a significant drop in the tremor, the eruptive episode was announced by a rapid increase in the volcanic tremor from 5.40 hours GMT - 7.40 local hours, which reached the highest energy level at 7.00 hours GMT (9.00 local time). The sources of the signal are located in the area of the New Southeast Crater at shallow depth.
The episode was accompanied by remarkable infrasound activity, which is also decreasing.
The INGV announces at 23:55 (21:55 UTC), the return of parameters to normal activity.
Sources: INGV OE - Boris Behncke and Joseph Nasi / Butterfly helicopters