A volcano erupted in southern Japan, spewing a plume of smoke about 1,000 meters into the air, the Weather Agency said. There were no reports of damage or injuries. Mount Sakurajima erupted Wednesday and registered as moderate on the agency's scale for both the sound and the strength of the tremors it caused, according to a volcano bulletin. The eruption followed several smaller ones in recent days, but there was no other significant change in volcanic activity, the bulletin said. "We do not believe that a large-scale eruption is imminent," said agency official Akira Otani.