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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
Merapi - Glowing blocks falling on 01.10.2021 - photo Akbar Wahyu via IG: Merapi uncover

Merapi - Glowing blocks falling on 01.10.2021 - photo Akbar Wahyu via IG: Merapi uncover

Over the past week, the seismicity of Merapi reveals a dual trend: a decrease in the number of blast / emission earthquakes, and an increase in the number of collapse / avalanche earthquakes.

For January 11, the daily seismicity breaks down into:

- 149 collapse / avalanche earthquakes

- 33 emission earthquakes

- 163 multiphase hybrid earthquakes

- 40 volcanic earthquakes and

- 3 tectonic earthquakes.

The EDM ratio has been 9 cm / day for 3 days.

 

Sources: Magma Indonesia and BPPTKG

Merapi - 11.01.2021 / 07:43 - photo IG: Merapi uncover

Merapi - 11.01.2021 / 07:43 - photo IG: Merapi uncover

Merapi - the glowing dome on 01.11.2021 / 07:43 a.m. - photo Thecholiks / Twitter

Merapi - the glowing dome on 01.11.2021 / 07:43 a.m. - photo Thecholiks / Twitter

Merapi - weekly seismicity as of 11.01.2021 - Doc. BPPTKG

Merapi - weekly seismicity as of 11.01.2021 - Doc. BPPTKG

Merapi - video Inisial T - 12.01.2021

In Kilauea, lava activity is confined to Halema'uma'u with lava erupting from vents on the northwest side of the crater. on the morning of January 10, the lava lake was about 196 m deep under the western vents while remaining stagnant on its eastern half.

SO2 emission rates are still high and the most recent measurements of the sulfur dioxide emission rate of 2,300 t / d on Sunday

The western vents showed a stronger flow from January 10 afternoon with splash and lava flows fueled by splashing from the top of small cones abutting the northwest wall of Halema'uma'u crater. Lava also flowed from the western vents into the lake through an encrusted channel.

All of the islands have been stationary for the past day, like frozen in the stagnant parts of the eastern lava lake. The dimensions of the main island have remained unchanged with its edges several meters above the surface of the lake.

 

Source: HVO-USGS

Kilauea - Halema'uma'u - Around sunset on Saturday (January 9, 2021), The West Vent is still actively emitting lava, but the flow into the lava lake is increasingly slower, as evidenced by the slow crustal plates near the once-vigorous vent outlet. - USGS photo by H. Dietterich.

Kilauea - Halema'uma'u - Around sunset on Saturday (January 9, 2021), The West Vent is still actively emitting lava, but the flow into the lava lake is increasingly slower, as evidenced by the slow crustal plates near the once-vigorous vent outlet. - USGS photo by H. Dietterich.

Kilauea - Halema'uma'u - current activity: the photo focuses on areas of active crustal movement in the western half of the lava lake; the eastern half (right) is mostly stagnant and displays much less glow. The west vent, still in active lava effusion but at a decreasing rate, is visible at the top left of the lake. USGS photo by H. Dietterich.

Kilauea - Halema'uma'u - current activity: the photo focuses on areas of active crustal movement in the western half of the lava lake; the eastern half (right) is mostly stagnant and displays much less glow. The west vent, still in active lava effusion but at a decreasing rate, is visible at the top left of the lake. USGS photo by H. Dietterich.

Kilauea - Halemauma ʻuma ʻu lava lake with an amazing rainbow this 11.01.2021! Bottom left is part of what remains of Rim Drive Crater, after the 2018 collapse took over the entire parking lot - still spectacular photo by Bruce omori / Extreme exposure / Paradise Helicopters

Kilauea - Halemauma ʻuma ʻu lava lake with an amazing rainbow this 11.01.2021! Bottom left is part of what remains of Rim Drive Crater, after the 2018 collapse took over the entire parking lot - still spectacular photo by Bruce omori / Extreme exposure / Paradise Helicopters

In Copahue, on the Chilio-Argentina border, the surface activity of the volcano results in emissions of gas and particulate material of power and dispersion within the standards of the current level.

The deformation measurements do not show any noticeable changes in relation to the internal activity of the volcanic system.

The sulfur dioxide emissions do not present an anomaly.

Two thermal anomalies were noted on January 10, 2021 at 11:45 a.m. / VRP 11MW and at 3:55 p.m. / VRP 18MW, by Mirova.

The alert level remains green

 

Sources: Sernageomin and Valentina Sepulveda

Copahue - 10.01.2021 / 12:45 from Caviahue - photo Valentina Sepulveda

Copahue - 10.01.2021 / 12:45 from Caviahue - photo Valentina Sepulveda

In Iceland, seismic swarms have returned to the Reykjanes Peninsula since January 7, still without any sign of the start of an eruption.

On January 10 at 03:15 UTC, a 4.1 Mw earthquake was felt over Reykjavik, preceding a daytime swarm of lower magnitude.

An increase in the number of earthquakes was observed between December 28 and January 3, with 400 earthquakes during the week against 140 the previous week. A small swarm marked the peninsula south of Merardalir on December 29 and 30, 2020.

 

Source: IMO

Reykjanes Peninsula - location and magnitude of earthquakes as of 11.01.2021 / 18:25 - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes as of 11.01.2021 / 18:25 - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes as of 11.01.2021 / 18:25 - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes as of 11.01.2021 / 18:25 - Doc. IMO

Reykjanes Peninsula - magnitude of earthquakes as of 12.01.2021 / 08:50 - Doc. IMO

Reykjanes Peninsula - magnitude of earthquakes as of 12.01.2021 / 08:50 - Doc. IMO

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