Unfortunately Japanese volcanoes only get a brief mention in the SI/USGS Weekly Activity Reports, but here is the current status of the most active volcanoes in the country as of September 27th. Below are the English translations of the volcano names and you will see that Sakurajima is the only volcano with an elevated alert status of level 3: an explosive summer appears to be continuing into autumn – so far today (1st Oct.) there have been 14 explosions!
浅間山, Asama: level 2.
三宅島, Miyakejima: level 2.
桜島, Sakurajima: level 3.
薩摩硫黄島, Satsuma-Iojima: level 2.
口永良部島, Kuchinoerabujima: level 2.
諏訪瀬島, Suwanosejima: level 2.