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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
Meradalur - visibility is slowly returning to a nice spattering activity - RUV webcam 10.08.2022 / 6:12 a.m. - one click to enlarge

Meradalur - visibility is slowly returning to a nice spattering activity - RUV webcam 10.08.2022 / 6:12 a.m. - one click to enlarge

The Civil Defense Scientific Council met on August 9 regarding the volcanic eruption on the Reykjanes peninsula.

The latest data and measurements were reviewed to assess the situation and the continuation of the eruption. Scientists believe that the progression of the eruption is proceeding as expected. Eruptive activity has remained fairly stable over the past few days and it is important to be prepared for the eruption to last long enough.

Reykjanes Peninsula - interferogram between 27.07.2022 and 04.08.2022 - Doc. via IMO - one click to enlarge

Reykjanes Peninsula - interferogram between 27.07.2022 and 04.08.2022 - Doc. via IMO - one click to enlarge

In satellite images showing terrain changes on the Reykjanes Peninsula since late July, signs of deformation can be seen a little northeast of Grindavík (see black box in image above). The deformation seen on the satellite images is at the origin of the earthquake which occurred on July 31 and measured M5.5.

At the Scientific Council meeting, other data from the region were discussed, e.g. GPS measurements, earthquake data and they show no evidence that magma is moving and the most likely explanation is surface changes that occurred during the earthquake about 10 days ago .

Nevertheless, researchers will collect more data to further confirm that this is the case. It was discussed that it would be important to further increase the monitoring of passage areas that may affect nearby settlements by installing more measuring devices for real-time monitoring.

Closed access to Meradalur - photo 08.08.2022 / Guðmundur Bergkvist - RÚV

Closed access to Meradalur - photo 08.08.2022 / Guðmundur Bergkvist - RÚV

Observance of indications and advice:

Authorities hope to find no visitors to the closed area on August 9, after two groups of tourists had to be searched for last night. One group got lost, and with extremely poor visibility, even the rescue helicopter had to call off its search. The other group was soaked and exhausted and needed help.

To make the closure really understandable for everyone, there will be even more security personnel in the area today to turn hikers away, and there is also a major closure on Suðurstrandavegur.

 

Children under 12 are no longer allowed to enter the Meradalir Volcanic Zone, reports RÚV. The Icelandic Civil Defense decided so for their safety with the Suðurnes Police Department and other emergency services during a meeting on August 09, 2022. From the start of the volcanic eruption, it had been made clear that gas development in Meradalur was stronger and could be life threatening for children and dogs due to their small size.

 

Sources: https://www.almannavarnir.is/ &Iceland Review

Sangay / Camera ECU-911. Incandescence in the crater 08.08.2022 / 23:27 TL

Sangay / Camera ECU-911. Incandescence in the crater 08.08.2022 / 23:27 TL

In Sangay, Ecuador, surface and internal activity levels as of 09.08.2022 / 11:00 a.m. are high, with no changes
Seismicity is characterized by:
55 blast earthquakes
32 long-period (LP) earthquakes
10 episodes of Emission Tremor

In the past 24 hours, Washington's VAAC has released 4 ash emission readings
heading west and northwest with a maximum height of 1770 meters above the crater.
The FIRMS system records 1 thermal alert and MIROVA records 1 moderate alert in Sangay
in the last 24 hours.
During the night hours it was possible to observe the incandescence at the level of the crater, and the rolling of the blocks on the sides of the volcano.
The Mounts system reports 109 tons of SO2, with data on 08/08/2022 at 6:27 p.m. TL

Alert level - SNGRE: Yellow

 

Source: IGEPN

Vulcano - fumaroles on the Fossa crater - Doc. INGV OE - one click to enlarge

Vulcano - fumaroles on the Fossa crater - Doc. INGV OE - one click to enlarge

During the week of August 1 to 7, 2022, the temperatures recorded on the rim of the crater of La Fossa de Vulcano show stable values ​​around 370°C
The CO2 flux in the crater area remained at medium-high values.
The SO2 flux in the crater area remained at a medium-high and stable level
CO2 fluxes at the base of the La Fossa cone and in the Vulcano Porto area: Stable values ​​of CO2 fluxes in the Rimessa and Camping Sicilia sites; on the Faraglione and P4max sites, values ​​close to the background noise are recorded.
Geochemistry of thermal aquifers: Synthesis
The physico-chemical parameters recorded in the Camping Sicilia well show stable values ​​at high levels compared to May. The level and conductivity values ​​measured in the Bambara well do not show any significant variations.

Vulcano - Daily frequency and cumulative number of microshocks (peak frequency between 1 and 30 Hz, between March and August 2022 - Doc. INGV

Vulcano - Daily frequency and cumulative number of microshocks (peak frequency between 1 and 30 Hz, between March and August 2022 - Doc. INGV

A low rate of occurrence of local micro-seismicity is noted, with a spectral peak greater than 1 Hz. High daily frequency of low frequency events (VLP).
Regional seismicity: No earthquake with Ml >= 1.0 was located, in the week in question, in the area of ​​the island of Vulcano.
No significant changes in deformation to report


Source: INGV OE Weekly Bulletin uploaded on 09.08.202

Sakurajima – SO2 signal of 5.02 DU at 2.3 km from Sakurajima – other source: Suwanosejima- Tropomi image of 09.08.2022 / DLR / BIRA / ESA.

Sakurajima – SO2 signal of 5.02 DU at 2.3 km from Sakurajima – other source: Suwanosejima- Tropomi image of 09.08.2022 / DLR / BIRA / ESA.

The activity continues at Sakurajima and Suwanosejima, as evidenced by a survey by Sentinel-5P Tropomi on 09.08.2022.

In the Ogasawara Islands, a plume of sulfur dioxide is noted at Nishinoshima.

 

Source: Tropomi

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