Spewing ash column from the pyroclastic flow rising to 4 km altitude on 29 Nov (image: KVERT)
The extrusive eruption at the volcano continues to be elevated.
A massive block-and-ash flow took place from the volcano’s active lava dome on 29 November. The KVERT surveillance cameras observed a dense grey billowing ash plume (so-called phoenix cloud) separating from the pyroclastic density current. The VAAC Tokyo reported the ash column up to 13,000 ft (4,000 m) height. The reason for this flow was the gradual accumulation of unstable lava dome material and its destabilization, resulting in a partial collapse.
It came during the intense phase of the volcano over the past few weeks as the active lava dome continues to grow and produce frequent incandescent rock falls to the southeast and southeast.
Strongly illuminated lava dome at Shiveluch volcano due to glowing rock falls (image: Yuri Demyanchuk)