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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
Semeru - activity on 08.12.2021 / 00:15 - PVMBG / Magma Indonesia

Semeru - activity on 08.12.2021 / 00:15 - PVMBG / Magma Indonesia

Semeru - Map of damage caused by the eruption of 04.12 - Nasa- JPL / Caltech / EOS Singapore satellite Alos2 sar uploaded on 07.12.2021 - one click to enlarge

Semeru - Map of damage caused by the eruption of 04.12 - Nasa- JPL / Caltech / EOS Singapore satellite Alos2 sar uploaded on 07.12.2021 - one click to enlarge

At Semeru, the day of December 7 is marked at the level of seismicity by:

3 eruption earthquakes, with an amplitude of 10 to 28 mm and an earthquake duration of 50 to 125 seconds.
4 pyroclastic flow earthquakes, with an amplitude of 16-22 mm and an earthquake duration of 185-267 seconds.
9 avalanche earthquakes, with an amplitude of 6-20 mm and an earthquake duration of 50-155 seconds.
15 blast / emission earthquakes, with an amplitude of 2 to 9 mm and a duration of 20 to 85 seconds.
2 deep volcanic earthquakes, with an amplitude of 20-21 mm, S-P 3-4 seconds and an earthquake duration of 35 seconds.

 

A new eruptive episode on December 8 at 12:01 am WIB was observed, accompanied by a thick plume of gray ash about 500 meters above the summit. It was recorded on a seismogram with an amplitude of 16 mm max. for 233 seconds.

The death toll from the December 4 eruption worsened, with 34 deaths and 16 missing; the evacuations concern 3,700 people, according to the local Search and Rescue agency.

 

Source: PVMBG, Magma Indonesia, BNPB

Semeru - moderate thermal anomaly at 08.12.2021 / 05h50 - Doc. Mirova_MODIS_VRP

Semeru - moderate thermal anomaly at 08.12.2021 / 05h50 - Doc. Mirova_MODIS_VRP

The INGV published the weekly bulletin of the activity in Vulcano (29.11 to 05.12.2021):

- Temperature of the fumaroles of the crater are appreciably stable at the same time on the edge and on the internal face, except for the site F5, where a strong decrease is observed.
- In the crater area, the CO2 flux values, while remaining at high values ​​(9070 g / m2 / day), show a downward trend. And the flow of SO2 appears at a high level
The CO2 flow measurements at the base of the La Fossa cone, acquired automatically by the VULCANOGAS network, remain stable at high values.
On the Palizzi site (P4max) the flow values ​​show a clear downward trend.
- Geochemistry of thermal aquifers: Stable temperature and conductivity values ​​in the well of Camping Sicilia. In the Bambara well, there is a slight increase in the level, while the conductivity values ​​continue to drop.
- Local seismicity: Significant increase in low frequency events (VLP).
Regional seismicity: Weak fracturing seismic activity.
- Deformations - GNSS: During the last week, a slight increase in the expansion of the area continues.
Deformities - Clinometry: The clinometric data do not show significant variations
- Gravimetric variations localized at the continuous station of VSOCR and VCARA are recorded. There are no variations attributable to significant phenomena of deep mass redistribution.

 

Source: INGV OE

Vulcano - fumarolic activity on 12/05/2021 - photo G. De Astis (INGV-Roma1) via INGV

Vulcano - fumarolic activity on 12/05/2021 - photo G. De Astis (INGV-Roma1) via INGV

Vulcano - fumaroles on 08.12.2021 / 07:42 - INGV webcam

Vulcano - fumaroles on 08.12.2021 / 07:42 - INGV webcam

Resumption of activity in Kilauea:

Lava resumed erupting from a single vent in the western wall of Halema'uma'u Crater on Kilauea after a 3-day break in activity. On Friday afternoon, the West Vent lava eruption rate declined sharply with a dramatic reduction in tremors and the start of a deflationary tilt.

Lava reappeared at the vent around 6:00 pm on the night of December 6 and covered the anterior expanse of the active lava lake around 3:00 am this morning on December 7, 2021. The eastern edge of the lake jutting out onto the lowest area of ​​the caldera collapse blocks remains stagnant.

This is the fourth and largest decrease in the vigor or pause of a rash since the rash began on September 29, and none of the previous events lasted more than 24 hours before resumption of the rash. eruptive activity.

Current volcano alert level: Watch
Current Aviation Color Code: Orange

 

Source: HVO-USGS

Kilauea / Halema'uma'u crater - 07.12.2021 / 07:50 - HVO webcam

Kilauea / Halema'uma'u crater - 07.12.2021 / 07:50 - HVO webcam

Kilauea - thermal anomalies at 07.12.2021 / 11:20 p.m. - note the interruption in measurements and activity - Doc. Mirova_MODIS_logVRP

Kilauea - thermal anomalies at 07.12.2021 / 11:20 p.m. - note the interruption in measurements and activity - Doc. Mirova_MODIS_logVRP

In La Palma, the seismicity remains low at intermediate depths and very low at depths greater than 20 kilometers. The level of tremor is at low values ​​with little variability.

The lava emitted by the Cumbre Vieja crosses the central zone and deviates towards the south, passing the viewpoint of Las Hoyas, towards the lower island. Numerous cracks on the western slope of Cogote mountain are identified through which lava flows.

La Palma - 07.12.2021 - cracks on the western slope of the mountain of Cogote and lava flows - Doc. IGME

La Palma - 07.12.2021 - cracks on the western slope of the mountain of Cogote and lava flows - Doc. IGME

La Palma - thermographic control of the flows cascading from the cliff on 07.12.2021 - view of the patroller of the Guardia Civil - Doc. InVolcano

La Palma - thermographic control of the flows cascading from the cliff on 07.12.2021 - view of the patroller of the Guardia Civil - Doc. InVolcano

La Palma - Stratigraphic section of volcanic ash for its observation and correlation with volcanic activity. - photo InVolcan 07.12.2021

La Palma - Stratigraphic section of volcanic ash for its observation and correlation with volcanic activity. - photo InVolcan 07.12.2021

Volcanologists continue to parameterize the volcano and its emissions, analyzing samples of lava, ash and gas, or by making stratigraphic sections of the ash for its observation in correlation with volcanic activity.

The affected area has increased by 27 hectares compared to the latest data and is estimated at 1,182 hectares with a maximum width of 3,350 meters, and more than 48 hectares of lava deltas.

Air quality shows good to fair levels.

The airport is operational, although airlines suspended flights yesterday due to the ash cloud situation. A new assessment is expected today.

 

Sources: InVolcan, IGN, IGME, DSN

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