Klyuchevskoy volcano (Kamchatka): massive pyroclastic flows, ash plume to 28,000 ft altitude

So, 24. Jan 2021, 13:29
13:29 PM | VON: T
Pyroclastic flow on Klyuchevskoy volcano earlier today (image: KVERT webcam)
Pyroclastic flow on Klyuchevskoy volcano earlier today (image: KVERT webcam)
Glow from the active lava flow
Glow from the active lava flow
The world's largest and most active stratovolcano had a phase of intense activity today: Increased lava effusion from the summit produced increasingly large avalanches on the SE flank that ended generating massive block and ash flows (pyroclastic flows), which in turn created a tall ash plume that rose to 28,000 ft (7.5 km) altitude as reported by the Volcanic Ash Advisory Center (VAAC) Tokyo.
The main phase of the eruption began around 17:30 local time (5:30 GMT) and lasted about 40 minutes as can be seen in the following time-lapse video:

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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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