JMA reported that the eruption at Suwanosejima’s Ontake Crater continued during 17-24 April. No explosions were recorded, but eruptive activity produced periodic ash plumes and ejected blocks as far as 300 m from the vent. On 17 April ash plumes rose 1-1.5 km above the crater rim and drifted E and SE, and on 18 April an ash plume rose 2 km and drifted N.
Ashfall was reported in Toshima village (3.5 km SSW) during 17-21 April. On 23 April an ash plume rose 1.1 km and drifted SW. The Alert Level remained at 3 (on a 5-level scale) and residents were warned to stay 2 km away from the crater.
Source: Japan Meteorological Agency (JMA)
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From: Global Volcanism Program, 2023. Report on Suwanosejima. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 19 April-25 April 2023. Smithsonian Institution and US Geological Survey.