Klyuchevskoy volcano (Kamchatka): strong ashfall related to elevated activity

Fr, 22. Jan 2021, 09:38
09:38 AM | VON: MARTIN
Ash deposits covered by snowlayer from the eruption of Klyuchevskoy volcano (image: volkstat.ru)
Ash deposits covered by snowlayer from the eruption of Klyuchevskoy volcano (image: volkstat.ru)
Ashlayer from the eruption of Klyuchevskoy volcano (image: volkstat.ru)
Ashlayer from the eruption of Klyuchevskoy volcano (image: volkstat.ru)
Ashlayer from the eruption of Klyuchevskoy volcano (image: volkstat.ru)
Ashlayer from the eruption of Klyuchevskoy volcano (image: volkstat.ru)
The effusive-explosive eruption of the volcano continues at elevated levels.
According to Yury Demianchuk from the volcanological observatory, a strong ashfall occurred in Kozyrevsk village, related as a response to an increased activity of the volcano recorded on 18 January at about 20:00 local time.
The fresh ash deposits formed ashlayer that was covered by half-meter of new snowlayer from continuous snowfall with prevailing eastern winds on 19 January. The ash plume extended about 50 km of the volcano.
The color and structure of the ash particles are very different from the previous eruptions of the volcano.
The lava flow on the south-southwest flank remains active and continue to emerge from the summit vent.

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NASA photo of the eruption of Klyuchevsky volcano on 30 September, 1994, the volcano's largest explosion in 40 years. The large
NASA photo of the eruption of Klyuchevsky volcano on 30 September, 1994, the volcano's largest explosion in 40 years. The large

Background:

Kliuchevskoi is Kamchatka's highest and most active volcano.  Since its origin about 6000 years ago, the beautifully symmetrical, 4835-m-high basaltic stratovolcano has produced frequent moderate-volume explosive and effusive eruptions without major periods of inactivity.  Kliuchevskoi rises above a saddle NE of sharp-peaked Kamen volcano and lies SE of the broad Ushkovsky massif.  More than 100 flank eruptions have occurred at Kliuchevskoi during the past roughly 3000 years, with most lateral craters and cones occurring along radial fissures between the unconfined NE-to-SE flanks of the conical volcano between 500 m and 3600 m elevation.  The morphology of its 700-m-wide summit crater has been frequently modified by historical eruptions, which have been recorded since the late-17th century.  Historical eruptions have originated primarily from the summit crater, but have also included numerous major explosive and effusive eruptions from flank craters.


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Source: Klyuchevsky information by the GVP (Smithsonian Institution)



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