Mount Io erupted again Thursday, a week after the volcano spewed a plume of ash over Kyushu for the first time in 250 years.
The scale of the eruption was very small, the Meteorological Agency said.
The agency said on April 20 that eruptions had stopped at the volcano, which is one of the Mount Kirishima group of volcanoes that straddles Miyazaki and Kagoshima prefectures. They had begun the previous day.
The latest eruption occurred around 6:15 p.m., with smoke from the crater reaching heights of more than 200 meters above the ground, the agency said.
As of Thursday the agency maintained an eruption warning of Level 3, which bans climbing on the mountain.
The agency urged caution regarding possible pyroclastic flow or rocks being ejected from the crater, which could reach areas up to about 2 kilometers from the volcanic vent.
