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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
La Palma / Cumbre Vieja - ash plume - photo InVolcan 25.09.2021

La Palma / Cumbre Vieja - ash plume - photo InVolcan 25.09.2021

In La Palma on the morning of September 25, there was a collapse of part of the western slope of the volcanic cone, which generated an avalanche formed by the large blocks detached from the mountain as well as the release of very fluid lava. All the materials moved at high speed on the old flows towards the west, towards the ocean. In the crack that remained after the collapse, three emission points are observed through which pyroclasts and gases are released. PEVOLCA scientists do not rule out new landslides.

La Palma / Cumbre Vieja - part of the Cone collapsed, uncovering three vents and massive flow of fluid lava - Doc. 25.09.2021 / GEOVOL - one click to enlarge
La Palma / Cumbre Vieja - part of the Cone collapsed, uncovering three vents and massive flow of fluid lava - Doc. 25.09.2021 / GEOVOL - one click to enlarge

La Palma / Cumbre Vieja - part of the Cone collapsed, uncovering three vents and massive flow of fluid lava - Doc. 25.09.2021 / GEOVOL - one click to enlarge

Since 12 p.m. UTC yesterday, 3 earthquakes with a magnitude greater than 2.2 (mbLg) have been located in the area of ​​the current volcanic eruption. Two of them located 11 km deep where it started on September 11.

The amplitude of the volcanic tremor reached the highest values ​​of the eruption in the last 24 hours, during the most explosive phase, reaching a maximum value around 14:00 UTC yesterday, just before the opening of a new mouth on the side of the cone. After opening, the average amplitude decreased considerably but remains at high values ​​similar to those of the previous days, although without detection of explosions.

La Palma / Cumbre Vieja - evolution of the tremor, with a fall around 3 p.m. on 25.09.2021 - Doc. InVolcano

La Palma / Cumbre Vieja - evolution of the tremor, with a fall around 3 p.m. on 25.09.2021 - Doc. InVolcano

La Palma / Cumbre Vieja - opening of a new vent - photo InVolcan 25.09.2021 / 13h46

La Palma / Cumbre Vieja - opening of a new vent - photo InVolcan 25.09.2021 / 13h46

The network of permanent GNSS stations on the island shows stability in the deformations.

The sulfur dioxide plume from the eruption is being monitored by Sentinel-5 P Tropomi on September 25 between 12:37 p.m. and 2:25 p.m. UT drifting over the coast of Morocco, Spain and southern France

Its dilution at altitude does not bode well for ground level problems.

 

Sources: IGNes, GEOVOL, PEVOLCA

La Palma / Cumbre Vieja - SO2 plume as of 25.09.2021 at 12:37 - 14:25 UT - Sentinel-5P image Tropomi / Bira / DLR / ESA Copernicus

La Palma / Cumbre Vieja - SO2 plume as of 25.09.2021 at 12:37 - 14:25 UT - Sentinel-5P image Tropomi / Bira / DLR / ESA Copernicus

La Palma - plume of gas and ash towards the NNE, and lava flows - Image Sentinel-2 bands 12,11,4 - one click to enlargeLa Palma - plume of gas and ash towards the NNE, and lava flows - Image Sentinel-2 bands 12,11,4 - one click to enlarge

La Palma - plume of gas and ash towards the NNE, and lava flows - Image Sentinel-2 bands 12,11,4 - one click to enlarge

Over the past 24 hours, the Taal volcano network has recorded 7 volcanic earthquakes, including 3 volcanic tremor episodes with durations of 2 to 13 minutes, 1 hybrid earthquake and low-level background tremor that has persisted since July 7, 2021.

The activity of the main crater was dominated by the rise of hot volcanic fluids in its lake which generated plumes 2000 meters high that drifted west-northwest.

Sulfur dioxide emissions remain high with an average of 8,631 tonnes / day on September 25, 2021. - 5,726 tonnes / day on September 24 - 7,822 tonnes / day on September 23.

Based on ground deformation parameters from electronic tilt, GPS and InSAR continuous monitoring, Taal Volcano Island began to deflate in April 2021 as the Taal region continues to decline. undergo a very slow extension. since 2020.

Alert level 2 (increased unrest) prevails over the Taal volcano.

 

Source: Phivolcs

Taal - activity summary as at 26.09.2021 - Doc. Phivolcs

Taal - activity summary as at 26.09.2021 - Doc. Phivolcs

In Fuego, Guatemala, the lava flows towards the barrancas Ceniza and Trinidad are no longer active.

Weak white fumaroles were observed at night and early in the morning, rising to 4,400 meters above sea level and the number of explosions remains within a range of 8 to 12 per hour, expelling columns of ash at an altitude of 4,700 to 4,800 m above sea level, moving west and southwest over a distance of 15 km.

Fine ash falls are reported in the communities of Panimaché I and II, Morelia, Santa Sofía, El Porvenir, Yepocapa and others in this direction.

Incandescent pulses were observed above the crater, and constant avalanches of boulders were heard in the direction of the barrancas Ceniza, Taniluya, Trinidad and Santa Teresa, some of the material reached the edge of the vegetation.

 

Source: Insivumeh

Fuego - Flir thermal image of the lava flow in barranca Ceniza -  09/24/2021 / 05h27 - Doc. William Chigna / Un. Bristol - Insivumeh - Conred

Fuego - Flir thermal image of the lava flow in barranca Ceniza - 09/24/2021 / 05h27 - Doc. William Chigna / Un. Bristol - Insivumeh - Conred

Fuego - fumaroles after the eruptive episode - photo Conred 24.09.2021

Fuego - fumaroles after the eruptive episode - photo Conred 24.09.2021

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