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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

The Goma Volcanological Observatory reports voluminous gas plumes emitted by the Nyiragongo during the period from January 3 to 5, 2022, as well as incandescence. Fountaining and collapses are observed at active vents on the crater floor. The lava lake is growing, with audible rumbles.

Seismology is mainly characterized by LP earthquakes north of the volcano, on the fracture connecting it to Nyamulagira at a depth of 0-10 km. The level of the tremor is decreasing.

Mirova reports thermal anomalies between 86 and 1071 MW on January 5.

The Nyiragongo alert level remains at Yellow / vigilance.

 

Sources: OVG Bulletin & Mirova

Nyiragongo - thermal anomalies at 01.05.2022 / 11:35 p.m. - Doc. Mirova_MODIS_VRP

Nyiragongo - thermal anomalies at 01.05.2022 / 11:35 p.m. - Doc. Mirova_MODIS_VRP

"The Erta Ale lava lake has finally regained visible activity after almost more than 5 years of inactivity, according to Seifegebreil Shifferaw.

Its depth is estimated at nearly 35 m from the edge, while the inner diameter of the crater housing the lava lake is around 200 m wide.

As a testimony to this promising enlargement observed, we expect its current activity to grow and flourish, as it did 125 years ago.

On December 31, in addition to this new activity of the lava lake, we also witnessed 2 large collapses, promising the return of a much larger, active and permanent lava lake, supported by magmatic convection and pressure from the gas-rich magma of the interior. "

 

Source : Seifegebreil Shifferaw January 4, 2022

Erta Ale- progression of the Ethiopian group - photo Seifegebreil Shifferaw 03.01.2022

Erta Ale- progression of the Ethiopian group - photo Seifegebreil Shifferaw 03.01.2022

IMO issued a map of Fagradalsfjall, showing the location of the new magma chamber (red line) based on models in relation to the magmatic intrusion that took place in February-March 2021 (black line). Orange circles represent earthquakes that have been measured since December 21, and green are earthquakes that have been measured from February 24 to December 21 (below).

Fagradalsfjall - location of the new magma chamber (red line) based on models with respect to the magmatic intrusion that took place in February-March 2021 (black line) - Doc.IMO 05.01.2022

Fagradalsfjall - location of the new magma chamber (red line) based on models with respect to the magmatic intrusion that took place in February-March 2021 (black line) - Doc.IMO 05.01.2022

New satellite measurements reviewed by scientists at the Icelandic Met Office now indicate about a 50% chance that there will be another eruption at Fagradalsfjall, Vísir reports.

These measurements indicate that the magma chamber beneath Fagradalsfjall is approximately 1,500 meters deep and has risen approximately 100 meters over the past five days. Eight days ago, the chamber was thought to be about two kilometers deep, indicating that it is increasing at a significant rate, told Kristín Jónsdóttir , seismic risk coordinator at the Icelandic Met Office, 

New satellite measurements reviewed by scientists at the Icelandic Met Office now indicate about a 50% chance that there will be another eruption at Fagradalsfjall, Vísir reports.

These measurements indicate that the magma chamber beneath Fagradalsfjall is approximately 1,500 meters deep and has risen approximately 100 meters over the past five days. Eight days ago, the chamber was thought to be about two kilometers deep, indicating that it is increasing at a significant rate, told Kristín Jónsdóttir, seismic risk coordinator at the Icelandic Met Office, in an interview.

 

Sources: IMO & The Reykjavik Grapevine

Semeru - Pyroclastic flow of collapse and plume on 01.05.2022 / 08:35 WIB - webcam PVMBG Magma Indonesia

Semeru - Pyroclastic flow of collapse and plume on 01.05.2022 / 08:35 WIB - webcam PVMBG Magma Indonesia

At Semeru, in activity level 3 / siaga, a white and gray plume is observable on January 5, 2022 at the main crater, with a moderate to high intensity, rising about 600 meters from the summit.

Seismicity is characterized by:

4 eruption earthquakes, with an amplitude of 15 to 26 mm and an earthquake duration of 70 to 170 seconds.
1 pyroclastic avalanche flow earthquake, with an amplitude of 26 mm and a duration of 969 seconds.
11 avalanche earthquakes with an amplitude of 2 to 12 mm and a duration of 30 to 75 seconds.
10 blast / emission earthquakes with an amplitude of 3 to 9 mm and the duration of the earthquake from 25 to 95 seconds.
9 Harmonic tremor periods, with an amplitude of 2 to 12 mm and an earthquake duration of 165 to 447 seconds.
1 distant tectonic earthquake with an amplitude of 26 mm, S-P 134 seconds and a duration of 559 seconds.
1 Flood Vibration earthquake with an amplitude of 10 mm and a duration of 1380 seconds.

Recommendations: Do not exercise any activity in the south-eastern sector along the Besuk Kobokan, up to 13 km from the summit (center of the eruption). Outside this distance, the community does not carry out activities within a distance of 500 meters from the embankment (border of the river) along Besuk Kobokan, as it has the potential to be affected by the expansion of hot clouds and lava flows up to a distance of 17 km from the summit.

Do not move within a radius of 5 km from the crater / peak of Mount Semeru because there is a risk of rock projections (incandescent).

Be aware of the potential for Pyroclatic Avalanche Flows (APGs), lava avalanches and lahars along the rivers / valleys that originate at the top of the Mount Semeru volcano, especially along Besuk Kobokan, Besuk Bang, Besuk Kembar and Besuk Sat as well as potential lahars in small rivers which are tributaries of Besuk Kobokan.

 

Source: PVMBG, Magma Indonesia

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