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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
Etna SEC - opening of a new fissural vent on 20.05.2022 / 5:34 p.m. - photo © Salvatore Lo Giudice via INGVvulcani - one click to enlarge

Etna SEC - opening of a new fissural vent on 20.05.2022 / 5:34 p.m. - photo © Salvatore Lo Giudice via INGVvulcani - one click to enlarge

Etna - tremor at 21.05.2022 / 06h - Doc. INGV OE

Etna - tremor at 21.05.2022 / 06h - Doc. INGV OE

From 15:30 UTC a new effusive vent opened on the north side of the SE crater of Etna, at an altitude of approximately 3,250 m a.s.l., immediately northwest of the mouth which opened on May 12.

A small lava flow is currently being emitted from the new vent towards the northeast.

At the same time, the lava flow at the mouth of May 12 continues, whose lava fronts are deposited in the Valle del Leone desert.
Finally, the SE crater continues to be affected by Strombolian explosive activity, of variable intensity, which from 3:30 p.m. UTC is accompanied by a discontinuous emission of diluted ash which disperses at 4:40 p.m. UTC.
From the seismic point of view, the average amplitude of the volcanic tremor, while showing large fluctuations in its trend, remains in the range of high values. The source of the volcanic tremor is located under the SE crater, at a depth of about 3,000m.

The infrasonic activity at the SE crater is quite sustained both in the number and in the energy of the infrasonic transients.
The signals acquired by the GNSS and clinometric networks do not show any significant variations related to the phenomenology in place.

The new eruptive fracture only remained active for a few hours. In the evening, only the May 12 fracture and the explosive mouth at the top remained active.

 

Source: INGV OE

EtnaWalk video - https://www.facebook.com/1548514495/videos/1195695161241291

Fuego - image Sentinel-2 bands 12,11,5 from 19.05.2022 - Via Insivumeh - one click to enlarge

Fuego - image Sentinel-2 bands 12,11,5 from 19.05.2022 - Via Insivumeh - one click to enlarge

Fuego - crater's glow on 19.05.2022 - Landsat 9 SWIR image - Doc. Insivumeh - one click to enlarge

Fuego - crater's glow on 19.05.2022 - Landsat 9 SWIR image - Doc. Insivumeh - one click to enlarge

At Fuego, 5 to 9 weak and moderate explosions per hour are recorded, with ash columns from 4,600 to 4,700 m. asl, extending 10 to 15 km in a northwesterly direction, on May 20.

Following the explosive activity, observers of the Fuego volcano report sounds similar to those of train locomotives lasting 1-2 minutes, low and moderate rumblings with a shock wave that vibrates the roofs and windows of houses around the volcano. In addition, incandescent pulses 300 to 400 meters above the crater and weak and moderate avalanches in the upper part of all the ravines.

The dispersion of the ashes augurs well for ash fall on Yepocapa and the communities to the northeast of the volcano.

 

Source: Insivumeh

Merapi - active between 13 and 19.05.2022 - PVMBG - BPPTKG

Merapi - active between 13 and 19.05.2022 - PVMBG - BPPTKG

This week, from May 13 to 19, 2022, at Merapi, there was 1 pyroclastic avalanche flow in the southwest (upstream of Kali Bebeng) with a sliding distance of 2,500 m. Lava avalanches were observed 82 times towards the southwest, dominating the Bebeng River, with a maximum slip distance of 2,000 m.

According to the photo analysis, the volume of the southwest lava dome is 1,551,000 m³ and that of the central dome is 2,582,000 m³, without morphological changes.

Mount Merapi's deformation, which was monitored using EDM this week, showed a distance shortening rate of 0.7 cm/day.

Merapi - summit morphology - Doc. BPPTKG report from 13 to 19.05.2022 - one click to enlarge

Merapi - summit morphology - Doc. BPPTKG report from 13 to 19.05.2022 - one click to enlarge

The level of activity remains at siaga; The current potential danger consists of lava avalanches and hot clouds in the south-southwest sector covering the Boyong river for a maximum of 5 km, the Bedog, Krasak, Bebeng river for a maximum of 7 km. The southeastern sector covers the Woro River for a maximum of 3 km and the Gendol River for a maximum of 5 km. Meanwhile, the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit. The public should not carry out any activity in potentially dangerous areas, anticipate disturbances due to volcanic ash from the Merapi eruption and be aware of the dangers of lahars.

 

Source: PVMBG - BPPTKG

Kilauea / Halema'uma'u - active lava lake of Halema‘uma‘u - photo L.Gallant 18.05.2022 / USGS - one click to enlarge

Kilauea / Halema'uma'u - active lava lake of Halema‘uma‘u - photo L.Gallant 18.05.2022 / USGS - one click to enlarge

Kilauea / Halema'uma'u - drainage of the active lava lake of Halema‘uma‘u - photo L.Gallant 18.05.2022 / USGS - one click to enlarge

Kilauea / Halema'uma'u - drainage of the active lava lake of Halema‘uma‘u - photo L.Gallant 18.05.2022 / USGS - one click to enlarge

In Kilauea, the eruption of the West Halema'uma'u vent into the active lava lake and crater floor has continued over the past 24 hours.

The active lava lake showed continued surface activity, with the lake level remaining relatively high, with some minor level fluctuations. Lava seep activity increased around midnight last night and continues with extensive seeps exiting the western edge of the lake.

Flyby measurements on May 10, 2022 indicated that the crater floor had experienced a total elevation of about 106 meters and 77 million cubic meters of lava had been shed since this eruption began on September 29, 2021.

A sulfur dioxide emission rate of approximately 2,800 tonnes per day (t/d) was measured on May 12, 2022.

 

Source: HVO-USGS

Cumbre Vieja  - nearly five months after the eruption was considered over. The volcano continues to emit gases, which are the cause of sulfur deposits and mineral salts. - Doc. InVolcan - one click to enlarge
Cumbre Vieja  - nearly five months after the eruption was considered over. The volcano continues to emit gases, which are the cause of sulfur deposits and mineral salts. - Doc. InVolcan - one click to enlarge

Cumbre Vieja - nearly five months after the eruption was considered over. The volcano continues to emit gases, which are the cause of sulfur deposits and mineral salts. - Doc. InVolcan - one click to enlarge

The Volcanological Institute of the Canary Islands (Involcan) has shared spectacular photographs that show the colorful appearance of the La Palma volcano nearly five months after the eruption was considered over. The volcano continues to emit gases, which are the cause of sulfur deposits and mineral salts.

InVolcan continues to monitor the seismo-volcanic activity of Cumbre Vieja, whose semaphore remains Amarilo.

 

Source: InVolcan & GUAYOTA-La Palma of May 20, 2022

LaPalma - Guayota as of 05.20.2022 - Semaphore AmarilloDoc. InVolcan - one click to enlarge

LaPalma - Guayota as of 05.20.2022 - Semaphore AmarilloDoc. InVolcan - one click to enlarge

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