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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
Santiaguito - plume, and incandescence in the crater and at the flow front - Landsat-9 Swir image from 14.08.2022 - Insivumeh - one click to enlarge

Santiaguito - plume, and incandescence in the crater and at the flow front - Landsat-9 Swir image from 14.08.2022 - Insivumeh - one click to enlarge

Given the strong expulsion of lava from the Santiaguito volcano, which advances on the bed of the San Isidro river, the municipality of Quetzaltenango has imposed a restriction within a radius of 5 kilometers around the colossus.

Due to the instability of the material in the so-called hot dome and the advance of molten rocks, avalanches and pyroclastic flows are generated, which raise thick curtains of ash reaching 800 meters in height. The municipal provision also prohibits staying inside the ravines / barrancas, due to the weak and moderate pyroclastic sequences which can cause serious damage or even death.

Yesterday the volcano maintained columns of white vapors of gas, 500 meters high, and avalanches of blocks which descend from the crater in a south-westerly and southerly direction.

 

Sources; Insivumeh and Diario de Centro America

Merapi - activity from 12 to 18.08.2022 - Doc. BPPTKG - one click to enlarge

Merapi - activity from 12 to 18.08.2022 - Doc. BPPTKG - one click to enlarge

During the week of August 12 to 18, 2022, 23 lava avalanches were observed southwest of Merapi, dominant up to the Bebeng River with a maximum slip distance of 1,800 m. No southwestern dome growth was observed, while for the middle dome no significant morphological changes were observed. According to photo analysis, the volume of the southwest lava dome is 1,664,000 m³ and that of the central dome is 2,772,000 m³.

The intensity of the earthquakes this week is still quite high.

Mount Merapi's deformation that was monitored using EDM this week showed no significant changes.

 

Merapi - seismicity and deformation on 08.18.2022 - Doc .BPPTKG

 

The activity level remains at 3 / siaga.

The current potential danger is in the form of lava avalanches and hot clouds in the south-southwest sector covering the Boyong River for a maximum of 5 km, Bedog River, Krasak, Bebeng for a maximum of 7 km . The southeast sector covers the Woro River for a maximum of 3 km and the Gendol River for a maximum of 5 km. the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

 

Source: BPPTKG

Meradalur - RUV Grímur Jón Sigurðsson 18.08.2022 - one click to enlarge

Meradalur - RUV Grímur Jón Sigurðsson 18.08.2022 - one click to enlarge

At Meradalur, the lava pond in the vent is lower and split into 2 springs. Yesterday's outflow channel is drained.
There was no visible lava flow from the eruption centers. Nevertheless, from time to time you can see majestic lava jets erupting from the crater rim, but it is clear that the eruption is at an absolute minimum at this time.
The fate of the eruption is unpredictable...stop or again?


 

Source: Visir webcam live

Abyss pool - West Thumb geyser Basin - photo Diane Renkin/NPS - one click to enlarge

Abyss pool - West Thumb geyser Basin - photo Diane Renkin/NPS - one click to enlarge

On Tuesday, August 16, 2022, an employee found part of a foot, inside a shoe, floating in Abyss Pool, located in the West Thumb Geyser Basin in the southern portion of Yellowstone National Park.
An investigation by National Park law enforcement is ongoing.
Evidence from the investigation so far suggests that an incident involving a person likely occurred on the morning of July 31, 2022 at Abyss Pool. The inquest is continuing to determine the circumstances surrounding the death.
Abyss Pool is over 6 meters deep and is one of the deepest hot springs in the park. Its temperature is around 60°C.
Visitors are reminded to stay on the boardwalks and trails in the spa areas and to exercise extreme caution.

 

Source: National Park Service / Yellowstone

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