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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
Geldingadalgos - 03.26.2021 / 11:15 am - RUV webcam

Geldingadalgos - 03.26.2021 / 11:15 am - RUV webcam

Geldingadalgos - 03.26.2021 / 2:06 p.m. - two active hornitos - RUV zoom mode webcam

Geldingadalgos - 03.26.2021 / 2:06 p.m. - two active hornitos - RUV zoom mode webcam

The eruption in Geldingadalur is still ongoing. The activity of the lava fountain is low and no volcanic ash was detected, but a high level of volcanic gases was measured near the eruption site, as well as very high thermal anomalies (measurements are less attenuated by the atmospheric conditions, this March 26, where we reached a VRP of 1172 MW).

Geldingadalgos / Krisuvik - Thermal anomalies at 03/27/2021 / 04:45 - Doc. Mirova - one click to enlargeGeldingadalgos / Krisuvik - Thermal anomalies at 03/27/2021 / 04:45 - Doc. Mirova - one click to enlarge

Geldingadalgos / Krisuvik - Thermal anomalies at 03/27/2021 / 04:45 - Doc. Mirova - one click to enlarge

The high resolution images from Planet Labs SkySats satellites give us an excellent synthetic view of the two active hornitos, the lava flow, the lava field, and the sulfur gas emissions.

The eruptive site in Gledingadalur - near IR image (the vegetation is in red) detailing the lava flow - Doc. PlanetLabs SkySats 26.03.2021 - one click to enlarge

The eruptive site in Gledingadalur - near IR image (the vegetation is in red) detailing the lava flow - Doc. PlanetLabs SkySats 26.03.2021 - one click to enlarge

The lava field in Geldingadalur continues to expand steadily. The Met Office has now made a lava flow forecast and, based on an eruption rate of five to six cubic meters per second, one can expect the lava field to pour into the next valley at Easter - likely Easter Monday (April 5).

 

Sources: IMO, RUV, mbls, PlanetLabs

Geldingadalgos - 17 day model with a constant flow of ~ 5.8 m³ / s. - Lava flow modeling by Gro B. M. Pedersen 26.03.2021

Geldingadalgos - 17 day model with a constant flow of ~ 5.8 m³ / s. - Lava flow modeling by Gro B. M. Pedersen 26.03.2021

The explosive eruptive activity of Nevados de Chillan remains low, without much impact. It generates dense pyroclastic density currents of low incidence.

The effusive activity is noticed by the continuous increase of the lava dome and the collapse deposits on the northeast side.

The L5 flow, on the northern flank, advances at an average of 0.1m. / h.year at the front and now measures 925 meters from the edge of the Nicanor crater. Its temperature is 236 ° C.

 

The seismic activity produced by the dynamics of internal fluids shows a stable trend.

The inflationary trend is maintained, as well as thermal anomalies consistent with the presence of a magmatic body on the surface.

The technical alert remains at Amarilla / Change in behavior of volcanic activity.

 

Source: Sernageomin

Nevados de Chillan - field analyzes of the L5 flow - Doc. Sernageomin 26.03.2021
Nevados de Chillan - field analyzes of the L5 flow - Doc. Sernageomin 26.03.2021

Nevados de Chillan - field analyzes of the L5 flow - Doc. Sernageomin 26.03.2021

There has been no change in the activities of the La Soufrière volcano in St. Vincent during the last twenty four hours.
Volcanic tectonic earthquakes continue to be recorded under the volcano and their magnitude is such that they can be felt in villages such as Fancy, Owia, Point and Sandy Bay.

The alert level remains at Orange.

The National Emergency Management Organization / NEMO reminds the public that no evacuation orders or notices have been issued, but also encourages residents, especially people living in communities near the volcano, to be more prepared in case it is necessary to evacuate at short notice.
NEMO continues to call on the public to refrain from visiting the La Soufrière volcano, in particular entering the crater, as this is extremely dangerous.

 

The senior scientist who monitors the La Soufrière volcano in St Vincent, Professor Richard Robertson, says an increase in earthquakes at the site could suggest an explosive eruption could occur soon. "And one of the things that will cause it to go explosive is the arrival of new materials; new material to give it energy," said Robertson, adding that the earthquakes that started on Tuesday could indicate that the fresh magma tries to make its way to the surface.

At the end of January, the dome was hovering around four to five million cubic meters. Now it is 13.1 million cubic meters. 

In January, the dome was between 100 and 200 meters in diameter, but it is now 900 meters long, and extends from the Larikai Breccia to where the fumarole is located on the pre-existing dome. "

 

Sources - UWI-SRC Bulletin LA SOUFRIÈRE # 43 of March 25, 2021 8:00 p.m., & NEMO

Soufriere of St. Vincent - partial view of the new lava dome on 23.03.2021 - photo NEMO

Soufriere of St. Vincent - partial view of the new lava dome on 23.03.2021 - photo NEMO

At Piton de La Fournaise, the number of tectonic earthquakes has been high over the last two days, with 79 VT earthquakes on 25.03 and 95 on 26.03.

Numerous landslides were reported: 8 on 25.03 and 13 on 26.03.

The GPS in the summit area and in the far field record inflation, witnessing the pressurization of a surface source and a deep source.

CO2 emissions from the ground: increasing throughout the network.

All the lights are on for a next activity, as Aline Peltier says, but what form will it take?

 

Sources: OVPF daily bulletins and local media

Piton de La Fournaise - 03.25.2021 / 10:16 GMT - webcam Dolomieu East / OVPF

Piton de La Fournaise - 03.25.2021 / 10:16 GMT - webcam Dolomieu East / OVPF

In short, and developed tomorrow, the volcanic activity of Merapi is still quite high in the form of effusive eruptive activity. The state of the activity is defined at level 3 / siaga.
Current potential hazards in the form of lava avalanches and hot clouds in the south-southwest sector include the Yellow, Boyong, Bedog, Krasak, Bebeng and White rivers for up to 5 km and in the southern sector. -est, the Gendol river for 3 km. During this time, the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

 

This March 27, between 00 and 12 h, seven pyroclastic flows of collapse were observed at Merapi.

 

Sources: PVMBG, Magma Indonesia, BPPTKG, local media.

Merapi - pyroclastic flow of collapse on 03/27/2021 / 06:34 - kamera CCTV FREKOM di Kemirikebo

Merapi - pyroclastic flow of collapse on 03/27/2021 / 06:34 - kamera CCTV FREKOM di Kemirikebo

Merapi - pyroclastic flow of collapse on 03/27/2021 / 6:34 a.m. - photo PVMBG / Magma Indonesia

Merapi - pyroclastic flow of collapse on 03/27/2021 / 6:34 a.m. - photo PVMBG / Magma Indonesia

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