The Ingv reports in its weekly bulletin on Etna from June 29 to July 5, 2020 (posted online on July 7) a modest deep intracrateric strombolian activity and degassing at the new southeast crater. The degassing activity also concerns the craters of Bocca Nuova, Voragine and the northeast crater.
Map of the summit area of Etna updated on May 9, 2020 by the group of drones INGV-OE on the DEM 2014, developed by the Laboratory of Aerogeophysics-Rome Section 2. Details of the SEC-NSEC system are shown (A) and BN and VOR craters (B). The indented blue line indicates a depression within the Bocca Nuova. The yellow circles indicate gas vents; the red circles indicate active mouths. The green polygon defines the cooling flow. - Doc. INGV-OE
In particular, observations made during the inspection on July 3 showed that the pit formed at the center of the depression of the Bocca Nuova crater is affected by a modest degassing from below.
Fumaroles developed in the southern sector of the bottom of the crater and also along the flows of Voragine in the BN until the end of April.
The Voragine crater is affected by a modest degassing of the main ash cone.
The North-East crater presents degassing activity from below which occasionally (July 2), was accompanied by a weak intra-crater strombolian activity.
Finally, during the week, a modest intra-crater strombolian activity continued at the mouths of the "saddle cone" of the New South-East Crater. This activity does not produce hot materials visible on the surface, but rather a night glow, and is associated with an intense pulsed degassing.
Overview of the bottom of the Bocca Nuova taken during the July 3 inspection from the western edge of the crater (photo E. De Beni). In the center, you can see the pit crater (cratere a pozzo) formed at the bottom of the crater. The fumarole systems are present both along the streams coming from the VOR (left) and are also visible in the southern sector of the bottom of the crater. - Doc. INGV-OE
The average amplitude of the volcanic tremor remained at a high level throughout the week. The source of the tremor was constantly located in the area of the New Southeast Crater, at a depth of about 2,900-3,000 meters above mean sea level.
Etna by DronDuilio - Licensed music by Murky Instrumental by Saint Mesa, and the participation of swifts.
During the past week, normal Strombolian-type explosive activity was observed in Stromboli, accompanied by degassing and spattering activities.
The total hourly frequency of explosions fluctuated between average values (10 events / h on July 3) and high values (21 events / h on June 29). The explosive activity was mainly produced by 3 eruptive vents located in the area of the North crater and by 3 eruptive vents located in the area of the Center-South crater. All the vents are placed inside the depression which occupies the crater terrace.
The various other parameters do not show significant changes.
Stromboli - The crater terrace seen by the thermal camera located on the Pizzo above the Fossa with the delimitation of the crater zones of the Center-South and North zone (ZONE N, ZONE C-S respectively). - Doc. INGV-OE
On Nishinoshima, thermal anomalies always remain very high to high according to Mirova.
External activity is characterized by the emission of ash plumes and vapors / gases as in the previous days.
On the Sentinel-5P / tropomi satellite images, a strong sulfur dioxide signal can be detected, with 16.84 DU of sulfur dioxide at an altitude of 9.73 km.
VAAC Tokyo continues to issue ash dispersal notices (According to VAAC. 1FL = 100 feet = 30.5 meters)
Sources: VAAC Tokyo, Mirova, Sentinel-5P / Tropomi and Nasa worldview
Nishinoshima - Strong SO2 signal near Nishinoshima on 08.07.2020 (with 16.84DU of SO2 at an altitude of 9.73km. - DLR / BIRA / EAS documents via Tropomi
Nishinoshima and 2 plumes, vapor/gaz tothe left, brow ash in the center, dispersing on the right - Doc. Nasa Worlview 08.07.2020
Nishinoshima - thermal anomalies and radiative power on 08.07.2020 / 03h20 - Doc. Mirova - one click to enlargeNishinoshima - thermal anomalies and radiative power on 08.07.2020 / 03h20 - Doc. Mirova - one click to enlarge
As a bonus, a lenticular machine ... the Popocatépetl