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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
Etna SEC - on 10/21/2021 in the morning - photo Boris Behncke

Etna SEC - on 10/21/2021 in the morning - photo Boris Behncke

Etna - hot spots at the summit craters on 10/21/2021 - image Sentinel-2 bands 12,11,4 - one click to enlarge

Etna - hot spots at the summit craters on 10/21/2021 - image Sentinel-2 bands 12,11,4 - one click to enlarge

At Etna, the south-eastern crater has been in Strombolian activity since October 20 at the start of the day;

This October 23, the average amplitude of the volcanic tremor continues the gradual upward trend, currently settling in the range of medium-high values, announcing a future paroxysm. The sources of the tremor are located in the SE crater at a depth of about 2900 m above sea level. At the same time, infrasonic activity increases with sources located mainly in the SE crater.

Etna -variations of the tremor at 23.10.2021 / 06h - Doc. INGV

Etna -variations of the tremor at 23.10.2021 / 06h - Doc. INGV

Currently, the unfavorable weather conditions allow an extremely discontinuous and partial display of the phenomenon in progress. In particular, from the visible camera of Montagnola and sometimes that of Monte Cagliato, one can glimpse frequent intermittent lightning, compatible with a probable Strombolian activity. Soil deformation monitoring networks do not show significant variations.

 

Update :

At 8:43 am, the Strombolian activity described in the previous press release rapidly evolved into a lava fountain.

At 08:49 UTC a flow of pyroclastic material was observed which detached from the east wall of the SE crater towards the Bove valley.

The INGV announces that the activity of the lava fountain is continuing. The ashes produced are driven by winds to the north.
At approximately 08:48, 09:02 and 09: 3 UTC, three streams of pyroclastic material occurred which detached from the eastern wall of the SE crater, covering approximately 1.5 km in the Valle del Bove. There is also a lava flow from the eastern flank of the CSE heading towards the Bove valley. The current phenomena were observed with discontinuity by the network of cameras, due to
adverse weather conditions.


09:37 UTC : From the camera array, another flow of pyroclastic material was observed from the eastern flank of the CSE, which traveled approximately 1.5 km towards the Valle del Bove.

At approximately 09:58 UTC, there was another flow of pyroclastic material from the eastern flank of the CSE. The flow was divided into two portions, the first heading towards the S stopping after a few hundred meters, while the second heading towards the Bove Valley. The activity of the lava fountain continues.
The activity produces an ash cloud directed towards the NE, relapses of pyroclastic material have been reported in the towns of Piedimonte and Linguaglossa. 

 

Source: INGV OE

 Etna SEC - coulée pyroclastique d'effondrement - Photo S.Mugnos 23.10.2021 / 08h49 UIC

Etna SEC - coulée pyroclastique d'effondrement - Photo S.Mugnos 23.10.2021 / 08h49 UIC

 Etna SEC - une des coulées pyroclastiques (petite et sans dommages)- photo Boris Behncke 23.10.2021

Etna SEC - une des coulées pyroclastiques (petite et sans dommages)- photo Boris Behncke 23.10.2021

Etna SEC - new climax underway on 23.10.2021 / 11:08 am - photo © Pippo Scarpinati

Etna SEC - new climax underway on 23.10.2021 / 11:08 am - photo © Pippo Scarpinati

Vulcano - fumaroles on the edge of the crater - photo INGV / 22.10.2021 - one click to enlarge

Vulcano - fumaroles on the edge of the crater - photo INGV / 22.10.2021 - one click to enlarge

This week, INGV researchers mainly engaged in sampling and analyzing four fumaroles placed on the edge and inner flank of the Crater de la Fossa in Vulcano.

These samples confirmed the presence of very high concentrations of gases such as CO2, SO2, Helium and Nitrogen, which continues to suggest a magmatic origin that underlies the current increase in fumarole activity present. on the island.

The temperature of the gases emitted by the fumarole system of the Crater de la Fossa reached 360 ° C in the area of ​​the crater rim and 220 ° C on its inner flank. Unfortunately, due to frequent and heavy rains in the last week, the average continuously recorded temperature is quite disturbed by the weather conditions.

On the other hand, the CO2 emissions on the ground recorded on a continuous basis have slightly increased in the Camping de Sicile and Remise areas, two localities which are respectively a few kilometers to the south-west and south-east of the inhabited region of Vulcano Porto. .

With regard to seismicity, the earthquakes of very small magnitude located at a shallow depth in the region of the Crater de la Fossa have decreased slightly compared to the previous week.

The cumulative deformation since September 13 is 2.5 cm. approximately, and does not seem to be progressing.

 

The agitation phase continues to be confirmed, some values ​​have increased during the week, while others have decreased ... the INGV concludes that the situation is not urgent. No evacuation is planned at this time, as there is no evidence that a volcanic eruption could begin anytime soon.

 

Source: CME INGV.

La Palma / Cumbre Vieja - activity from 10/22/2021 / 8:25 p.m. - photo Carlos Lorenzo / IGEM / Canarias radio - one click to enlarge

La Palma / Cumbre Vieja - activity from 10/22/2021 / 8:25 p.m. - photo Carlos Lorenzo / IGEM / Canarias radio - one click to enlarge

At Cumbre Vieja, the reconnaissance flight on October 22 was carried out by descending along the main feed channel of the active flows, from the effusive lava outlet (note that the channel is open, like a ditch). Then, following the channel, one observes areas of lava tube (that is to say closed with a roof of solidified lava) which sometimes have "windows" or skylights through which the gases and the incandescent lava exit. . - Video footage recorded by the #IGME Aerial Work Service (#STA) in collaboration with the Emergency and Rescue Group (#GES) of the Government of the Canary Islands.

La Palma / Cumbre vieja - effusive lava exit on 21.10.2021 - IGME-CSIC video

On the night of the 22nd, a lava overflow took place, probably following an obstruction of the channel, the formation of a temporary lava lake which eventually overflowed.

The intermediate mouth of the main cone of the La Palma eruption has become a secondary cone, growing and gaining in height ... it could join the main crater and widen it, or partially crumble and reform into an iron cone -on horseback towards the north-west.

 

Sources : IGNes, InVolvan IGME, Canarias radio

La Palma / Cumbre vieja - 22.10.2021 - the intermediate mouth of the main cone grows in the shape of a secondary cone - photo Itahizo - one click to enlarge

La Palma / Cumbre vieja - 22.10.2021 - the intermediate mouth of the main cone grows in the shape of a secondary cone - photo Itahizo - one click to enlarge

The Kīlauea volcano is erupting. Since this morning of October 21, 2021, lava continues to emerge from a single vent in the western wall of Halema'uma'u crater. All lava activity is confined to Halema'uma'u Crater in Hawai'i Volcanoes National Park. volcanic gas emission rates remain high.
No significant change observed in summit tilt or GPS observations. The seismic activity remains below the background noise and the volcanic tremor has remained high since the start of the eruption.

The western end of the lake showed a maximum elevation of about 791 meters above sea level by the HVO permanent laser range finder on October 21, 2021, which is an increase of 1 meter from the measurement of October 19, 2021 and a total increase of about 47 meters since lava emerged on September 29. The total erupting volume since the start of the eruption was estimated to be around 19.9 million cubic meters on October 15.
The west vent had constant fountain heights of up to 5m with occasional bursts of up to 10m observed by field crews on October 20.

 

Source: HVO

Kilauea - Halema'uma'u lava lake - Spattering at the west vent - USGS photo by D. Downs 20.10.2021 - one click to enlarge

Kilauea - Halema'uma'u lava lake - Spattering at the west vent - USGS photo by D. Downs 20.10.2021 - one click to enlarge

Kilauea - high thermal anomalies at 22.10.2021 / 12h15 - Doc. Mirova_MODIS_logVRP

Kilauea - high thermal anomalies at 22.10.2021 / 12h15 - Doc. Mirova_MODIS_logVRP

Kilauea - eruptive volcanic activity at 20.10.2021 - Doc. USGS - one click to enlarge

Kilauea - eruptive volcanic activity at 20.10.2021 - Doc. USGS - one click to enlarge

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