A magnitude-5.2 earthquake on Wednesday jolted Kumamoto Prefecture and other parts of Kyushu that were damaged by deadly temblors in April, the Meteorological Agency said.
No tsunami alert was issued after the 7:46 p.m. quake, which originated under the city of Kumamoto, the agency said.
The quake registered lower 5 on the Japanese seismic intensity scale to 7 in parts of the prefectural capital and the city of Uki.
There were no immediate reports of injuries or damage.
Kyushu Electric Power Co. said no abnormalities were detected at the Sendai nuclear power plant's No. 1 and No. 2 reactors in Kagoshima or the Genkai nuclear plant in Saga Prefecture.