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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 Santa María-Santiaguito Volcanic Complex is in a period of high extrusive activity that built a lava dome in the Caliente Dome crater and generated lava flows with west and southwest directions.

From 6:45 p.m. local time on January 29, 2022, the INSIVUMEH seismic network located in the Santiaguito volcano records the descent of constant avalanches, the volcano is covered with cloud cover, but the west and south-west flanks of the Caliente dome can be most affected ; these avalanches are of weak, moderate and strong characteristics, this activity caused moderate to strong ash fall in Loma Linda and moderate ash in San Marcos Palajunoj, El Palmar, Quetzaltenango.

Collapses of materials accumulated in the crater dome and / or lava flows on the west and south-west flanks could cause the descent of pyroclastic flows on the flanks of the Caliente dome, especially in the west, south-west, south directions. and Southeast. As well as abundant ash fall in communities and farms near the volcano.

Santiaguito - 2022.01.29-30. - seismicity of the last hours - Insivumeh stationSTG8

Santiaguito - 2022.01.29-30. - seismicity of the last hours - Insivumeh stationSTG8

Santiaguito - ash dispersion map as of 01.29.2022 / 8 p.m. - Doc. Insivumeh

Santiaguito - ash dispersion map as of 01.29.2022 / 8 p.m. - Doc. Insivumeh

Conred is ready to take the necessary measures to keep communities and farms near the volcano within a radius of 3 to 5 kilometers prepared, to activate protocols before the fall of ash and / or the descent of pyroclastic flows during the following hours and days. It is recommended to limit the approach to the domes in any direction.

 

Sources: special volcanological bulletin Insivumeh & Conred

Taal - summary of observations as of 30.01.2022 / 05h - Doc. Phivolcs

Taal - summary of observations as of 30.01.2022 / 05h - Doc. Phivolcs

The Taal Volcano Network recorded eight “very weak” phreatomagmatic bursts from Taal Main Crater on January 29, 2022, between 3:50 p.m. and 9:57 p.m. These events were very short in duration, lasting only 10 seconds to two minutes and produced only traces in the seismic recording but were accompanied by distinct infrasound signals.

Steam-rich plumes 400m to 900m high were also detected by visual and thermal cameras around Lake Taal.

The sulfur dioxide flux since the start of 2022 has averaged 10,668 tonnes/day, with the highest average emission at 18,705 tonnes/day on January 27, 2022.

In contrast, almost no volcanic earthquake activity has been recorded since December 19, 2021, and Taal Volcano Island has deflated since October 2021 based on continuous GPS monitoring.

This type of activity continues on January 30 at 05h (see daily summary of observations)


The public is reminded that Alert Level 2 (heightened unrest) prevails at Taal Volcano and that such gas explosions and lethal accumulations or expulsions of volcanic gases may occur and threaten areas in and around TVI. DOST-PHIVOLCS strongly recommends that entry into TVI, the Taal Permanent Danger Zone or PDZ, especially the vicinity of the Main Crater and Daang Kastila Fissure, as well as human activities on Taal Lake, be strictly prohibited. .

 

Sources : TAAL VOLCANO ADVISORY 29 January 2022 10:00 P.M. and summary of activity 

Semeru - seismogram of 01.29.2022 / 10:47 p.m. WIB - Doc. PVMBG / Magma Indonesia

Semeru - seismogram of 01.29.2022 / 10:47 p.m. WIB - Doc. PVMBG / Magma Indonesia

Semeru experienced an eruptive episode on Saturday January 29, 2022 at 10:34 p.m. WIB. No visual rash was observed. This eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 220 seconds.

 

During the last 24 hours, a plume is observable at the main crater, white and gray, of moderate to high intensity, about 200-500 meters from the summit.

Seismicity is characterized by:

- 39 eruption earthquakes, with an amplitude of 10-22 mm and an earthquake duration of 40-140 seconds.
- 1 pyroclastic flow earthquake, with an amplitude of 22 mm and an earthquake duration of 222 seconds.
- 1 avalanche earthquake, with an amplitude of 4 mm and an earthquake duration of 40 seconds.
- 3 blast/emission earthquakes, with an amplitude of 4 to 9 mm and an earthquake duration of 40 to 50 seconds.
- 21 harmonic episodes with an amplitude of 5-20 mm and an earthquake duration of 155-3306 seconds.
- 4 distant tectonic earthquakes

The activity level remains at 3 / siaga, with recommendations:

Do not carry out any activity in the southeastern sector along Besuk Kobokan, up to 13 km from the summit (the center of the eruption). Beyond this distance, the community does not conduct activities within 500 meters of the bank (river edge) along Besuk Kobokan due to the potential for hot clouds and lahars to expand up at a distance of 17 km from the summit.
Do not travel within 5 km of the crater/summit of Mount Semeru as it is subject to the danger of rock throwing (incandescent).

 

Sources: PVMBG, Magma Indonesia

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