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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

This August 12 at 8:00 p.m. local time, the IGEPN announces an increase in the internal and superficial activity of the Sangay volcano.

From 10:00 TL, an increase in seismic energy was recorded, which resulted in the emission of a new lava flow, sounds heard in Guayaquil and ash falls in the province of Chimborazo and possibly in Guayas. Due to the good weather conditions, the sounds and the ash emission had higher than normal ranges. This pulse of activity is distinguished by the emission of a large lava flow which was observed with satellite images and the ECU-911 camera.

Sangay - lava flow on 08.12.2022 / 7:43 p.m. - ECI 911 / IGEPN webcam - one click to enlarge

Sangay - lava flow on 08.12.2022 / 7:43 p.m. - ECI 911 / IGEPN webcam - one click to enlarge

From 13:00 TL, through satellite images (GOES-16), an ash cloud is observed which reaches less than 2 km above the crater and heads west.

 

Saturday, August 13, 2022 - Updated 1:30 p.m. TL.

The ash cloud from the Sangay volcano extends to the province of Guayas. This emission has already caused ash falls in the province of Chimborazo and Guayas yesterday and today in the province of Chimborazo (Alausí). For the moment, the cloud is diffuse and could cause a slight ash fall in Guayaquil. Thanks to good weather conditions, this low-altitude broadcast managed to travel more than 200 km to the west and southwest of the volcano.

 

Source : IGEPN

Sangay - evolution of the ash cloud on 08.12.2022 / 22:30 UTC (sat. GOES-16 NOAA) and on 08.13.2022 / 15:30 UTC (CIRA RAMMB) - one click to enlarge
Sangay - evolution of the ash cloud on 08.12.2022 / 22:30 UTC (sat. GOES-16 NOAA) and on 08.13.2022 / 15:30 UTC (CIRA RAMMB) - one click to enlarge

Sangay - evolution of the ash cloud on 08.12.2022 / 22:30 UTC (sat. GOES-16 NOAA) and on 08.13.2022 / 15:30 UTC (CIRA RAMMB) - one click to enlarge

Passive degassing has continued at Turrialba without eruptive activity since August 11, 2022.

A fumarolic incandescence is observed in the crater. Seismicity is maintained with frequent low frequency, low amplitude events. Geodetic monitoring demonstrates a horizontal contraction of the volcanic edifice.

 

Seismic activity remained stable on August 12, with around 100 daily events and a downward trend. The deformation pattern continues with the contraction and subsidence of the Irazú-Turrialba massif, more marked around the Turrialba crater.

SO2 has not been detected by satellite since the end of June, the apparent concentration of SO2 remains stable.

 

The active crater has only been visible for a short time these days, often shrouded in fog.

The activity level is 2 – Warning.

 

Source: Ovsicori

Turrialba - 08.11.2022 / 12:18 p.m. - Ovsicori webcam - one click to enlarge

Turrialba - 08.11.2022 / 12:18 p.m. - Ovsicori webcam - one click to enlarge

Turrialba - 08.12.2022 / 5:38 p.m. - Ovsicori webcam - click to enlarge

Turrialba - 08.12.2022 / 5:38 p.m. - Ovsicori webcam - click to enlarge

Turrialba - 08.13.2022 / 07:38 - Ovsicori webcam - one click to enlarge

Turrialba - 08.13.2022 / 07:38 - Ovsicori webcam - one click to enlarge

According to I.G.Peru, an anomalous seismic swarm was detected on August 13, 2022 at Ticsani.

More than 412 earthquakes of magnitude less than M3.2, associated with the rupture of rocks, were located 4.5 km south of the recent dome of Ticsani, and a depth of 12 km from the level of the crater. Slight gas emissions are visible on the webcam.

The alert level remains green; Without other parameter changes, two scenarios arise: 1. cessation of activity, 2. continuation of episodes lasting days and weeks, with earthquakes associated with volcanic fluids indicating a magmatic ascent, leading to an eruptive process.

 

Source: I.G.Peru

Ticsani - activity from 01 to 13.08.2022 - Doc. I.G.P.

Ticsani - activity from 01 to 13.08.2022 - Doc. I.G.P.

Eruptive activity waned between 6:30 a.m. and 7:30 a.m. on August 13 at Meradalur, but resumed approximately a little later.
Volcanologists and geophysicists from the Icelandic Meteorological Office are set to investigate whether this can lead to new cracks forming. The same situation occurred during the 2021 eruption, as a sharp drop in activity preceded the opening of new eruptive vents.
The lava flow has not yet escaped Meradalir Valley, but it should happen soon. Meanwhile, the lava continues to travel north.

The lava flows randomly, mainly in the vicinity of the crater, mainly to the west and north, explains Kristín Jónsdóttir.
But currently it's not possible for scientists to say whether lava will overflow the valley "tomorrow or within a week" ...a plan to divert lava from fiber optic cables via diversion dams is in the study.
About the main cone, the only one remaining active on the fissure, it soon appears to form a typical cone, with a pool of lava inside reminiscent of a small cauldron of boiling lava.
The weather at the eruption site was favorable today, but from a volcanic hazard perspective, gas emissions may accumulate in the valleys.

 

Sources : IMO, RUV, mbls, Iceland Review

Fagradalsfjall - tremor on 13.08.2022 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor on 13.08.2022 - Doc. Hraun.vedur.is

Meradalur - the cone closing - photo © Pascal Blondé 12.08.2022

Meradalur - the cone closing - photo © Pascal Blondé 12.08.2022

Meradalur - early evening atmosphere - photo © Pascal Blondé 12.08.2022

Meradalur - early evening atmosphere - photo © Pascal Blondé 12.08.2022

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