Overblog
Editer l'article Suivre ce blog Administration + Créer mon blog

Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sheveluch - activity from 20.07.2022 / 06:11 - IVS webcam via KVERT - one click to enlarge

Sheveluch - activity from 20.07.2022 / 06:11 - IVS webcam via KVERT - one click to enlarge

The growth of the Sheveluch lava dome continues, strong fumarolic activity and incandescence of the lava dome, explosions and hot avalanches accompany this process. Video data from KVERT showed an ash plume up to 5,000 m. altitude, extending to the east of the volcano.

The extrusive eruption of the volcano continues. Ash explosions up to 10-15 km (32,800-49,200 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

 

The aviation code remains orange

 

Sources: KVERT, VAAC Tokyo, Mirova.

Sheveluch - thermal anomalies at 07.20.2022 / 02:30 - high on 07.20 - Doc. Mirova _MODIS_Latest10NTI

Sheveluch - thermal anomalies at 07.20.2022 / 02:30 - high on 07.20 - Doc. Mirova _MODIS_Latest10NTI

Sheveluch - volcanic ash advisory at 20.07.2022 / 05:21Z - Doc. VAAC Tokyo

Sheveluch - volcanic ash advisory at 20.07.2022 / 05:21Z - Doc. VAAC Tokyo

During the week of July 11-17, 2022, a normal Strombolian-type explosive activity was observed at Stromboli.

The total hourly frequency of explosions varied at low values ​​(3-5 events/h) with the sole exception of 6 events/h on July 17. The intensity of the explosions was low and medium in both the North Crater area and the Center-South Crater area.

Stromboli – New digital shaded 3D model of the relief of the crater area of ​​July 17, 2022; Red circles indicate active craters, yellow the source of continued intense degassing/puffing activity. - Doc. INGV OE UNO project - one click to enlarge

Stromboli – New digital shaded 3D model of the relief of the crater area of ​​July 17, 2022; Red circles indicate active craters, yellow the source of continued intense degassing/puffing activity. - Doc. INGV OE UNO project - one click to enlarge

Stromboli - a) Mouth of circular shape inside N2 characterized by incandescence. b) Detail of the external N2 mouth (Sciara side) characterized by the presence of incandescence.- Doc. INGV OE as of 15.07.2022. - one click to enlarge

Stromboli - a) Mouth of circular shape inside N2 characterized by incandescence. b) Detail of the external N2 mouth (Sciara side) characterized by the presence of incandescence.- Doc. INGV OE as of 15.07.2022. - one click to enlarge

From July 15, an intense degassing activity was continuously observed at the mouth positioned on the outer side of N2 (Sciara side). This degassing produces an incandescence due to the heating of the rocks by the gas, visible during the day thanks to drone overflights and at night in the form of a persistent glow. The N2 crater produces mostly gas explosions every few tens of minutes which can be heard as dry rumblings.
 

The seismological parameters monitored do not show any significant variations.
Over the period studied, the island's soil deformation monitoring networks did not record any significant changes.
CO2 fluxes in the crater area remain at average values. The average weekly value of the C/S ratio in the plume is on average values ​​(C/S = 9.6) There are no updates on the isotopic ratio of helium in the aquifer.
The thermal activity observed by satellite in the summit area was weak.

 

Source: INGV OE – weekly bulletin

Etna - a) Bottom of the Bocca Nuova / BN taken from the northern edge of the Voragine / VOR; b) BN1 and BN2 pit craters present at the bottom of BN; c) nocturnal flashes at the BN filmed by the visible camera of Piedimonte. Photos a) and b) of F. Ciancitto, taken during the inspection of July 16, 2022 – c) webcam July 11, 2022 - click to enlarge

Etna - a) Bottom of the Bocca Nuova / BN taken from the northern edge of the Voragine / VOR; b) BN1 and BN2 pit craters present at the bottom of BN; c) nocturnal flashes at the BN filmed by the visible camera of Piedimonte. Photos a) and b) of F. Ciancitto, taken during the inspection of July 16, 2022 – c) webcam July 11, 2022 - click to enlarge

At Etna, the week of July 11 to 17 was marked by degassing of the summit craters.

Specifically, during the July 11 flyby and July 16 inspection, the Bocca Nuova 1 vent showed degassing at a variable and pulsating rate, while BN2 showed intense degassing with continuous emission of reddish ash. , which rapidly diluted in the atmosphere. During the inspection, occasional roars were heard coming from the bottom. At night, the images from the video surveillance system showed flashes in correspondence with the craters of the pits.

Etna - a) SEC fumarole degassing sampled on the southeast edge of BN; b) obstructed bottom of the main cone present in the VOR; c) obstructed bottom of the NEC, taken from the southern rim of the crater. Photo by F. Ciancitto, taken during the inspection on July 16, 2022, via INGV OE - one click to enlarge

Etna - a) SEC fumarole degassing sampled on the southeast edge of BN; b) obstructed bottom of the main cone present in the VOR; c) obstructed bottom of the NEC, taken from the southern rim of the crater. Photo by F. Ciancitto, taken during the inspection on July 16, 2022, via INGV OE - one click to enlarge

The Southeast crater showed modest degassing produced by a fumarolic field located on the rim of the crater.

The Voragine crater and the North-East crater had the bottom obstructed by debris and did not present thermal and degassing anomalies, except of the fumarolic type.

 

Low fracturing seismic activity is reported; the average amplitude of the volcanic tremor is on a medium-high level.
Infrasound activity is rated as moderate to high, with sources concentrated in the Bocca Nuova area.

The fluxes of SO2 and CO2 remain at an average level. The thermal activity observed by satellite in the summit area is low.

 

Source: INGV OE – weekly bulletin

Commenter cet article

Archives

Articles récents

Hébergé par Overblog