Aso volcano (Kyushu Isl., Japan): sudden large explosion this morning

Mi, 20. Okt 2021, 06:53
06:53 AM | VON: T
Explosion from Aso's Nakadake crater this morning (image: screenshot of RKK video)
Explosion from Aso's Nakadake crater this morning (image: screenshot of RKK video)
A strong explosion occurred this morning, at around 11:43 local time, from the volcano.
During a phase of intense steam emissions, suddenly an explosion occurs that sends a large column of ash to several kilometers height as well as a dense, ground-hugging circular base surge that almost reaches the visitors'center. On the following embedded video, large ballistic projectiles can be seen ejected from the center of the explosion and landing in several hundred meter distance as well.
From the appearance of the eruption, it looks most likely as a phreatic type explosion, or steam-driven, as a larger pocket of overheated water under the crater suddenly flashed to steam and decompressed in the process, generating lots of block and ash fragments as well as dense and heavy turbulent mixtures that are seen rising and spreading from the center.
Video:


The ash plume rose to approx. 11,000 ft (3.5 km) altitude. A few hikers who were approaching the crater were reported to have been able to escape to safety, and there are no reports of casualties.
The alert status of the volcano was raised from 2 to 3 on a scale of 1-5 by the Japanese Meteorological Agency (JMA).

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Mi, 20. Okt 2021, 06:00
JMA characterized the eruption at Asosan that occurred at 1143 on 20 October as medium-sized. The event ejected blocks 900 m S, produced pyroclastic flows that descended 1.3 km W, and generated an ash plume that rose 3.5 km above the crater rim. Very small eruptive events were recorded during 1244-1410. ... Read all
Mi, 20. Okt 2021, 03:00
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