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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 - white plume at Bocca Nuova, gray plume at southeast crater and flows in Valle del Bove - Image Sentinel-2 bands 4,3,2 & bands 12,11,8A from 06.11.2022 / 09:50 - via Mounts project - one click to enlarge

Etna - white plume at Bocca Nuova, gray plume at southeast crater and flows in Valle del Bove - Image Sentinel-2 bands 4,3,2 & bands 12,11,8A from 06.11.2022 / 09:50 - via Mounts project - one click to enlarge

The INGV communicates that the opening of a new effusive vent has occurred at Etna, at an altitude of about 1900 m above sea level near the fracture system located in the north wall of the Valle del Bove in the Serracozzo region in which an effusive vent opened on June 7.

The emitted flow appears poorly fed and the lava flow has extended over a few tens of meters.
During the day, the effusive activity produced by the vents opened on May 29 at an altitude between 2900 and 2750 m. above sea level and the explosive activity at the level of the southeast crater continued, both with a variable rate.
The average amplitude of the volcanic tremor does not show significant variations; although in the last two days there has been a trend of a gradual and slight increase in its values, they remain within the range of average values. The sources of the tremor are located in the southeast crater, at a depth between 2900 and 3000 m above sea level.

Infrasound activity is moderate and mainly located in correspondence with the Bocca Nuova crater; however, the strong wind, altering the detection capacity of the network, induces an underestimation of the data collected.

The thermal anomalies, noted by Mirova Modis on June 11, range between VRP 867 Mw and 1111 MW.
The stations of the clinometric and GNSS network do not show any significant deformations of the ground.

 

Sources: INGV OE & Mirova.

Etna - Radiative power as of 06.12.2022 / 00:20 - Doc. Mirova MODIS_VRP

Etna - Radiative power as of 06.12.2022 / 00:20 - Doc. Mirova MODIS_VRP

INGV researchers from the Palermo section take monthly gas samples from the fumaroles of the island of Vulcano as part of the geochemical monitoring of active volcanoes.
The sampling sites used for fumarolic gas monitoring are 4 high temperature fumaroles, located on the rim and inner side of the La Fossa crater and a low temperature fumarole at Vasca dei Fanghi (mud bath) in the area of Levante beach.
The study carried out on the physico-chemical variations of the gases will serve to provide important indications for the development of geochemical models capable of describing the circulation of fluids in the volcanic system of the island and of evaluating the state of activity of the volcano.

In addition, the data is made public through the publication of periodic bulletins for use by national and regional civil protection departments (Sicily), for the assessment of alert levels.

 

Source: INGV Palermo

Vulcano / La Fossa - Gas measurements in Vulcano - INGV vulcani

Vulcano / La Fossa - Gas measurements in Vulcano - INGV vulcani

Vulcano / Vasca dei Fanghi - Gas measurements in Porto Levante (mud baths) - INGV vulcani

Vulcano / Vasca dei Fanghi - Gas measurements in Porto Levante (mud baths) - INGV vulcani

In Bulusan, in the Philippine archipelago, the Phivolcs reports yesterday and the day before yesterday a significant number of volcanic earthquakes, with respectively 136 and 149 episodes.

A phreatic eruption was reported on June 12 at 3:37 a.m., lasting 18 minutes.

Sulfur dioxide emissions are 824 tons/day on June 09, and 613 tons/day on June 10.

Inflation marks the volcano.

Bulusan - daily activity reports of June 11 and 12, 2022 - Doc. Phivolcs - one click to enlargeBulusan - daily activity reports of June 11 and 12, 2022 - Doc. Phivolcs - one click to enlarge

Bulusan - daily activity reports of June 11 and 12, 2022 - Doc. Phivolcs - one click to enlarge

The alert remains at level 1 / abnormal conditions. Local authorities and the public are reminded that entry into the permanent danger zone (PDZ) with a radius of 4 kilometers must be strictly prohibited and that vigilance in the extended danger zone (EDZ) of 2 kilometers over the southeast sector should be exercised due to the increased possibilities of sudden and dangerous phreatic eruptions. Civil aviation authorities should also advise pilots to avoid flying close to the volcano's summit, as ash from a sudden phreatic eruption can be hazardous to aircraft. In addition, people living in valleys and along river/stream channels, especially in the southeast, southwest, and northwest sectors of the edifice, should be vigilant against runoff and lahars loaded with sediments in the event of heavy and prolonged rains in the event of a phreatic eruption.

 

Source: Phivolcs

Merapi - photo Abidmuslich r. 11.06.2022 via IG: Merapi Uncover

Merapi - photo Abidmuslich r. 11.06.2022 via IG: Merapi Uncover

At Merapi, during the week of June 03 to 09, 2022, the observatory mentions 75 lava avalanches were observed in the southwest, dominant up to the Bebeng River with a maximum slip distance of 2,000 m.
The southwest dome is not observed changes in the height of the dome. For the middle dome, no significant morphological change was observed. According to 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.
The intensity of seismicity this week is still quite high. Mount Merapi's deformation, which was monitored using EDM this week, showed a distance shortening rate of 1.5 cm/day.


Merapi's volcanic activity is still quite high in the form of effusive eruption activity. The level is at 3 – 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 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

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