JMA reported that there were four events and nine explosions at Minamidake crater (at Aira Caldera?s Sakurajima volcano) during 9-16 April.
Tephra was ejected as far as 1.3 km from the crater, and plumes rose as high as 2.5 km above the crater rim.
Crater incandescence was visible on most nights.
The Alert Level remained at 3 (on a 5-level scale).
Source: Japan Meteorological Agency (JMA)