In light of a court ruling on Tuesday, Japan's nuclear watchdog will consider reviewing its guidelines for evaluating the risk of volcanic activity to a nuclear power station.
The ruling allowed a reactor at the Ikata plant in Ehime Prefecture to restart. The Hiroshima High Court pointed out that the guidelines were made on the premise that the timing and scale of a catastrophic volcanic eruption can be predicted with a quite high level of accuracy.
Japan's Meteorological Agency is warning that the volcano on Kuchinoerabu Island in the country's southwest remains active despite a decline in the number of volcanic earthquakes.
Only one volcanic quake had been detected as of 6 PM on Thursday, compared with 37 the day before, when the agency raised the eruption alert to the second highest level of 4.