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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
Kilauea / Halema'uma'u - west vent and lava lake on 11.23.2021 - photo B. Carr / HVO-USGS

Kilauea / Halema'uma'u - west vent and lava lake on 11.23.2021 - photo B. Carr / HVO-USGS

In Kilauea, lava continues to emerge from a single vent in the western wall of Halema'uma'u Crater, while the eastern edge of the lake continues to advance over the lower exposed blocks of soil in the caldera. The western end of the lake showed a maximum rise of around 808 meters above sea level by the HVO permanent laser range finder this morning, and a total increase of over 65 meters since lava emerged on the September 29. The webcams show splash and accumulated lava in the west vent, an area of ​​active lava on the surface of the lava lake, and sporadic lava seeps along the cooler outer margins of the lake.

The total volume of the eruption since the start of the eruption was estimated to be around 30 million cubic meters on November 16.
Sulfur dioxide emission rates remain high, with an emission rate for November 23, 2021 of around 6,400 tonnes per day. The average SO2 emission rate for the past few weeks is around 3,000 tonnes per day.

Summit tiltmeters have generally recorded net deflation over the past day.

Seismicity remains stable. The seismic activity remains below the background noise and the volcanic tremor has remained high since the start of the eruption.

 

Source: HVO- USGS

La Palma / Cumbre Vieja - photo of the two new eruptive mouths south of the cone on 26.11.2021 - Doc. GEVolcan La Palma

La Palma / Cumbre Vieja - photo of the two new eruptive mouths south of the cone on 26.11.2021 - Doc. GEVolcan La Palma

La Palma / Cimbre Vieja - great pyrocumulus above the eruptive site on 26.11.2021- photo Efemérides Meteorológicas Canarias

La Palma / Cimbre Vieja - great pyrocumulus above the eruptive site on 26.11.2021- photo Efemérides Meteorológicas Canarias

In La Palma, the PEVOLCA indicates the reopening of an eruptive focus, with the emission of a flow in a southwest direction less than 1 kilometer south of the main cone.

Mirova noted very severe thermal anomalies on November 26 at 11:10 p.m. from VRP 7103MW, and on November 27 at 3:35 a.m. from VRP 5538MW.

Spectacular pyrocumulus clouds overcome the eruptive site during the day.

La Palma - RSAM at 11.26.2021 / 8.45 a.m. - Doc. IGN

La Palma - RSAM at 11.26.2021 / 8.45 a.m. - Doc. IGN

La Palma - seismicity at 27.11.2021 / 07:02 - Doc. IGN

La Palma - seismicity at 27.11.2021 / 07:02 - Doc. IGN

From November 25 to 26 at 9 a.m. UTC, a total of 44 earthquakes were located in the area affected by the volcanic reactivation on the island of La Palma, 5 of which were felt by the population.
Seismicity continues below the central area of ​​Cumbre Vieja the same areas of previous days, most earthquakes are located at depths of 10-15 km and only 7 of them at depths greater than 30 km.
The maximum recorded magnitude is 4.8 (mbLg) corresponding to yesterday's earthquake at 22:40 UTC, with a depth of 37 km and an intensity IV-V (EMS98).

The amplitude of the volcanic tremor signal continues at low average levels with fluctuations coinciding with the effusive episodes observed yesterday.

The network of permanent GNSS stations shows vertical uplift movements at the stations closest to the eruptive centers, the magnitude of which remains to be confirmed due to unfavorable weather conditions.

In the rest of the stations, the slight deflation possibly linked to the deep seismicity has stabilized, except in LP01 which continues to record it.

In view of the image calibrated at 07:36 UTC, a column height of 3500 m is estimated, and a cloud diffusing in the easterly direction.
The height of the cone is measured by obtaining a value of 1,126 m. asl.

 

Regarding air quality, good values ​​were recorded in all the stations on the island, both for PM10 particles and sulfur dioxide (SO2).

According to the latest cadastre data, there are approximately 1,506 buildings destroyed and with regard to the information provided by the Copernicus satellite, it is estimated that there are 2,786 buildings / buildings affected.

Regarding meteorology, it is expected that the turn of the wind will move the ash cloud and SO2 towards the west, which will suppose a favorable scenario for the operation of the airport of La Palma. In addition, the episode of intense rain on the island of La Palma should ease.

 

Sources: IGME, IGN, DSN, Mirova

Grimsfjall -  Photo Golli. during the Glaciological Society's spring trip to Grímsvötn on the Vatnajökull glacier

Grimsfjall - Photo Golli. during the Glaciological Society's spring trip to Grímsvötn on the Vatnajökull glacier

Travel to and around Grímsvötn and Grímsfjall is not advised, a South Iceland Police notification says, as a / jökulhlaup ice breakup is expected.

IMO water meters showed shortly after noon that the temperature in Gígjukvísl was rising. In addition, the electrical conductivity increased slightly. The sag can be tracked on near real-time GPS counters on the Meteorological Office website. https://brunnur.vedur.is/gps/grimsvotn.html


The police statement says dangerous crevasses can form in the ice, even along usual safe routes on the glacier due to ice melting from below. Cracks and crevices can also form along the flood road east of Grímsfjall and down to Skeiðarárjökull.
When a jökulhlaup flows out of Skeiðarárjökull, gases are released which can sometimes exceed sanitary limits.

 

Sources: IMO, Iceland University, Almannavarnir

The sag can be tracked on near real-time GPS counters on the Meteorological Office website. - on 11/27/2021 at 7:33 UTC

The sag can be tracked on near real-time GPS counters on the Meteorological Office website. - on 11/27/2021 at 7:33 UTC

The Nevado del Ruiz volcano continues to emit water vapor and gases, mainly sulfur dioxide.

The SGC reports an ash fall on November 26 in the morning in various sectors of the city of Manizales, in relation to gas AND ash emissions; these emissions are related to the seismic signals of moderate energy levels associated with the movements of internal fluids.

The level of activity remains at Amarillo / 3.

 

Source: SGC 26.11.2021 / 10:50 local

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