"The plume reached the height of 3,000 metres for the first time since April 3, 2011" following a total of 29 eruptions at Mount Shinmoedake, Japan's weather agency said in a statement.
The volcano, which featured in the 1967 James Bond film "You Only Live Twice", has been grumbling since Thursday.
But today and the previous day, the volcano produced so-called "explosive" eruptions, which also feature air blasts.
Footage captured by the Meteorological Agency showed lava and thick grey smoke rising from the mountain around midnight.
There have been no injuries reported as a result of the volcanic activity.
Japan, with scores of active volcanoes, sits on the so-called Pacific "Ring of Fire" where a large proportion of the world's earthquakes and volcanic eruptions are recorded.
In January, a soldier from the country's Self-Defense Forces was killed and several other people injured after an eruption near a popular ski resort in northwest of Tokyo.
On September 27, 2014, Japan suffered its deadliest eruption in almost 90 years when Mount Ontake, in central Nagano prefecture, burst unexpectedly to life.
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