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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

Pavlof Volcano, a snow- and ice-capped stratovolcano located at the southwestern tip of the Alaska Peninsula, continues to erupt from the active vent just below the summit on its eastern flank.

An almost continuous seismic tremor was recorded throughout the week. Clouds frequently obscured satellite and web camera observations, but no ash emissions were observed during periods of clear weather.

Elevated surface temperatures in the region of the active vent were observed sporadically in satellite data and incandescence was observed in nighttime web camera views, both consistent with a minor lava eruption.

Pavlof - Sentinel-2 L1C false color image (Urban) of 05.10.2022 / 00h - 23h59 - Doc. Copernicus - one click to enlarge

Pavlof - Sentinel-2 L1C false color image (Urban) of 05.10.2022 / 00h - 23h59 - Doc. Copernicus - one click to enlarge

Periods of lava spattering and fountaining from the vent on the upper eastern flank of the volcano have been occurring since mid-November 2021. This activity has built a small cone and sent lava flows down the flank, which are melting snow and ice, and produce varying amounts of meltwater. . Meltwater usually incorporates loose debris on the volcano's flank and forms thin lahars (less than 2 m thick). The lahar deposits extend down the east-southeast flank for several kilometres, not quite to the base of the volcano.

Previous eruptions at Pavlof indicate that the level of unrest can change rapidly and progression to greater eruptive activity can occur with little or no warning.

Current Volcano Alert Level: Watch
Current Aviation Color Code: Orange

 

Sources AVO & Copernicus

Kanlaon - photo archives Bongbong Woo Tadifa

Kanlaon - photo archives Bongbong Woo Tadifa

Kanlaon - activity as of 10.09.2022 - Doc. Phivolcs

Kanlaon - activity as of 10.09.2022 - Doc. Phivolcs

The Phivolcs informs, for the day of October 8 to 9 / 5:00 in Kanlaon, a total of 15 volcanic earthquakes, a moderate high emission of 200 meters, and a weak inflation of the building.

The alert remains at 1, with a ban on entering a permanent danger zone (PDZ) of 4 km radius, and on flying with any device near the volcano.

Phreatic, or steam driven, eruptions can occur suddenly.

 

Source: Phivolcs 09.10.2022

Whakaari - new active vent on 08.10.2022 - photo GNS Science - one click to enlarge

Whakaari - new active vent on 08.10.2022 - photo GNS Science - one click to enlarge

Over the past few weeks, a new active steam and gas vent has developed over Whakaari/White Island. As the vent widens, it can sometimes tear material from the walls of the vent, which will mix with steam and gas creating minor volcanic ash in the plume above the volcano - easy to spot with these clear skies!
This photo shows the steam and gas vents on Wednesday, and the vent is in the center. Experts assure us that there is currently no cause for alarm as the volcano is passively outgassing, a normal process for Whakaari/White Island.

The volcano remains under surveillance, awaiting the reproduction of these episodes.
 

Source: GNS Science

Mount Pelée in the background of the OVSM - Volcanological and Seismological Observatory of Martinique,

Mount Pelée in the background of the OVSM - Volcanological and Seismological Observatory of Martinique,

Between September 30 and October 7 at 4 p.m. UTC, the Volcanological and Seismic Observatory of Martinique recorded at least 14 volcano-tectonic earthquakes of magnitude less than 0.1 at Mount Pelée. Two of these low-energy earthquakes were located inside the volcanic edifice about 1,000 meters below the summit, and not felt.

Seismicity is associated with the formation of micro-fractures.

The alert level remains at yellow / vigilance.

 

Source: OVSM – IPGP Weekly report

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