Paroxysm of Etna, and activity of the Semisopochnoi and the Phlegraean Fields.

Continuation of the activity of the south-east crater of Etna ...

From the seismic point of view, the phase of increase in the average amplitude of the volcanic tremor continued; it reached the base of the high level around 13:30 UTC. The sources of the tremor remain in the area of ​​the southeast crater, at an altitude of approximately 2,800 m above sea level. Infrasonic activity showed a further increase in the rate of occurrence of events and their magnitude. Infrasonic events are located at the southeast crater.

From 14:20 UTC from the cameras of the CCTV network, a modest overflow of lava is observed from the Southeast Crater, which flows in a West - Southwest direction.

From about 16:00 UTC, there was, in alternating phases in terms of intensity and frequency, a decisive intensification of Strombolian activity at the level of the Southeast Crater. Based on the forecast model, the volcanic plume is heading west. The lava flow produced by the ongoing activity to the southeast of the crater seems to be still fed and its front has reached an estimated altitude of around 2900 m above sea level.
The phase of increase in the average amplitude of the volcanic tremor continued, which reached a high level with an oscillatory trend. The sources of the tremor remain in the southeast crater area, at an altitude of about 2800-2900 m above sea level. Infrasound activity also showed an upward trend, characterized by fluctuations marked with the rate of occurrence of events and their amplitude values ​​ranging from medium to high. Infrasonic events are mainly localized to the southeast crater.

From about 20:40 UTC, we observe the passage of Strombolian activity in the form of a lava fountain to the southeast of the crater, 500-600 meters high. The lava flow produced by activity at the SE crater continues to be well fed. The eruptive cloud produced by the current activity, reaches a height of about 10,000 m., dispersing towards the western sector of the volcano.
The average amplitude of the volcanic tremor has reached very high values ​​and the sources remain in the area of ​​the southeast crater, at an altitude of about 2900-3000 m above sea level.

At 8:40 p.m., 9:19 p.m. and 9:26 p.m. UTC, the activity of the southeast crater produced three small flows of pyroclastic material. The first two flows traveled a few hundred meters towards the Valle del Bove while the third headed south, also covering a few hundred meters.

At 23:19 UTC, INGV reports that lava fountaining from the southeast crater has ceased. The eruptive cloud produced by the activity, at about 8,000 meters above sea level, disperses in the western sector of the volcano. The lava flow produced by the current activity at the Southeast Crater seems still fed and the front is at an altitude of about 2,700 m.
The average amplitude of the volcanic tremor, after reaching the maximum value at 21:00 UTC, underwent a rapid decrease, returning to the average level.

Currently, this parameter shows a trend of further decrease. The center of gravity of volcanic tremor sources remains localized in the area of ​​the southeast crater at an altitude of about 2900 m above sea level. At the same time, infrasonic activity also suffered a decrease rapid in both the number of events and the amplitude.
The tilt network showed variations within a few microradians during lava fountaining activity. On the other hand, no significant change was observed in the time series of the GNSS network.

Sources: INGV OE – photos by Pippo scarpinati, Boris Behncke and Gio Giusa

Thanks to the photographers!

Near-continuous low-level eruptive activity continues from Mount Cerberus North Crater at Semisopochnoi. Seismicity remains high and several small explosions have been detected. A low-level ashy plume was observed in webcam data during the day yesterday and today.

Small eruptions producing minor ash deposition near Mount Cerberus' active north crater and ash clouds generally below 10,000 feet (3 km) above sea level have characterized recent activity. Small explosions and associated ash emissions may continue and be difficult to detect, particularly when heavy cloud cover obscures the volcano.

The current alert level is Watch, and the aviation code is Orange.

Semisopochnoi is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.

Source: AVO

Update on Campi Flegrei, from the January 2022 watch bulletin.

The Phlegraean Fields show activity related to the current phase of bradyseism which began at the end of 2005.

The average uplift velocity measured in recent months is about 13 ± 2 mm/month and the uplift reached a value of about 90 cm from November 2005.

In January, 260 earthquakes with a maximum magnitude of 2.5 ± 0.3 were recorded.

The geochemical parameters confirm the long-term trends of warming and pressurization of the hydrothermal system.

Based on information from all monitoring systems, there is no evidence to suggest significant changes in the short term. The alert level for Campi Flegrei is confirmed as "Yellow".

Source: INGV