Sinabung volcano (Northern Sumatra, Indonesia): explosion triggered pyroclastic flows

Fri, 16 Jul 2021, 06:05
06:05 AM | BY: MARTIN
Gravity-driven mass flows (so called pumice-and-ash flows) produced by eruption column collapse (image: @oysteinvolcano/twitter)
Gravity-driven mass flows (so called pumice-and-ash flows) produced by eruption column collapse (image: @oysteinvolcano/twitter)
The eruptive activity of the volcano continues.
The volcano observatory detected vulcanian explosion from its crater on 13 July. An ash plume rose 1,600 ft (500 m) above the summit and drifted east-southeast. It also produced pyroclastic flows (gravity-driven mass flows) that traveled over the upper slopes caused by eruption column collapse as denser pyroclastic material imparted by the gas thrust runs out, it can only collapse downwards under gravity.
The seismic station recorded 35 volcano-tectonic earthquakes today.
The warning bulletin states that ballistic impacts of volcanic bombs and pyroclastic flows could affect an area of about 3 km distance from the main crater and 5 km on the SE flank and 4 km on the NE flank.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi volcano activity update 15 July 2021

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