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Shiveluch volcano (Kamchatka): elevated activity, large pyroclasitc flows on 11 and 16 May 2017
Thursday May 18, 2017 15:49 PM | BY: T
Pyroclastic flow on Shiveluch on 16 May evening (KVERT webcam)
Ash emission from the active dome (KVERT webcam)
The activity at the volcano has been elevated recently. Two relatively large eruptive events occurred on 11 and 16 May; both seem to have been caused by collapses of a larger section of the growing lava dome and/or associated explosions, and both generated larger pyroclastic flows and ash plumes.
The most recent event occurred on 19:07 local time on 16 May. It prooduced a large pyroclastic flow with two pulses from the the southwest and east slopes of the active dome. The flow reached approx. 6-7 km distance at average speed of 12 m/s. Its associated ash plume rose to estimated 10 km altitude, triggering Tokyo VAAC to temporarily raise the Aviation Color Code to RED.
From webcam information, it seems that after the 11 May event, a section of the eastern part of the dome was missing, suggesting that that event also was at least partially caused by a collapse of the dome.
After 11 May, relatively strong intermittent ash emissions were observed from the volcano, as well as a few smaller pyroclastic flows.
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