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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
The Chikurachi volcano - photo Alex. Belousov / KVERT

The Chikurachi volcano - photo Alex. Belousov / KVERT

A strong plume of gas and steam, containing certain amounts of ash, was reported by KVERT on January 31, 2022 at 02:00 UTC in Chikurachki, in the northern Kuriles. It extends 75 km to the southwest of the volcano, at an altitude of 4,500-5,000 meters. This activity continues. Ash explosions that can exceed 6,000 meters asl. can occur at any time and affect aviation.

Aviation color code changed from green to orange.

The last activity of the Chikurachki is dated from July 27 to August 18, 2016 (GVP).

Chikurachki, the tallest volcano on the island of Paramushir in the northern Kuriles, is actually a relatively small cone built on top of a tall Pleistocene volcanic edifice. The basaltic to oxidized andesitic scoria deposits covering the upper part of the young cone give it a characteristic red color. Frequent Plinian basaltic eruptions occurred during the Holocene. Lava flows 1781 m high Chikurachki reached the sea and formed capes on the northwest coast
 

Sources: KVERT, VAAC Tokyo & Global Volcanism Program

Chikurachki - Volcanic ash advisory at 31.01.2022 / 0713Z - VAAC Tokyo

Chikurachki - Volcanic ash advisory at 31.01.2022 / 0713Z - VAAC Tokyo

Chikurachki, on Paramushir Island SW of the tip of the Kamchatka Peninsula - Nasa Worlview Eodis 2016 image

Chikurachki, on Paramushir Island SW of the tip of the Kamchatka Peninsula - Nasa Worlview Eodis 2016 image

The National Institute of Geophysics and Volcanology, Etneo Observatory, reports that weak Strombolian activity continues at Etna's southeast crater. This activity produces light and discontinuous ash emissions which disperse rapidly in the atmosphere.
The amplitude of the tremor is almost stationary and reaches average values. The sources are located SE of the Southeast Crater at a level of about 3000 m. altitude
Infrasound activity is generally weak.
The stations of the ground deformation monitoring networks (GPS and tilt) operating on the volcano do not show significant variations.

 

Source: INGV OE 31.01.2022 – 12:59 p.m.

Etna SEC - 31.01.2022 / 10:57 am - webcam2 LAVE

Etna SEC - 31.01.2022 / 10:57 am - webcam2 LAVE

Etna SEC - ash emission on 31.01.2022 / 12:10 p.m. - INGV webcam

Etna SEC - ash emission on 31.01.2022 / 12:10 p.m. - INGV webcam

The week of January 24 to 30, 2022 is characterized in Sabancaya by moderate eruptive activity, with an average of 28 explosions per day, accompanied by plumes of ash and gas reaching 2,500 meters above the summit.

During this period, the IGP detected 275 earthquakes of volcanic origin, associated with the circulation of internal magmatic fluids. The VT earthquakes, in connection with the fracturing of rocks, remain localized to the west of the volcano, of magnitude up to M2.9. No significant deformation anomalies.

The volcanic alert remains at naranja, coupled with an inaccessible zone of 12 km radius around the crater.

 

Source: I.G.Peru

Sabancaya - activity report between 24 and 30.01.2022 / I.G.Peru

Sabancaya - activity report between 24 and 30.01.2022 / I.G.Peru

Using satellite imagery and sophisticated GPS instruments, geophysicists at the Cascades Volcano Observatory have detected a subtle increase in the rate of ground surface uplift approximately 5 km west of South Sister Volcano , Oregon.

The uplift is attributed to small pulses of magma accumulating about 7 km below the ground surface. Although any magmatic intrusion could eventually lead to a volcanic eruption, an eruption would likely be preceded by detectable and more vigorous earthquakes, ground movement (deformation), and geochemical changes.

Comparison of vertical GPS motion measured at station HUSB - USGS


None of these signs are presently detected. The alert level and the color code of the volcano remain at NORMAL / GREEN.

 

Source: CVO

Three Sisters, Oregon - radar interferogram 19.06.2020 - 13.08.2021 - Doc. USGS

Three Sisters, Oregon - radar interferogram 19.06.2020 - 13.08.2021 - Doc. USGS

South Sister, Oregon – USGS photo

South Sister, Oregon – USGS photo

USGS geologist Dan Dzurisin is near Sisters, central Oregon, setting up portable GPS monitoring equipment to track something that's been going on for 25 years and is still happening today. today. It is an uplift, a subtle elevation of the ground surface, in an area to the west of the South Sister volcano.

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