An earthquake with a magnitude of 5.1 hit Miyazaki Prefecture and other areas in southwestern Japan on Monday but no tsunami warning was issued, Japan's weather agency said.

The 10:25 a.m. quake registered lower 5 on the Japanese seismic intensity scale of 7 in the prefecture, with no immediate reports of casualties.

The focus of the temblor was off the eastern coast of Osumi Peninsula on the southwestern main island of Kyushu, occurring at a depth of 39 kilometers, revised from an earlier estimate of 40 km.

The Japan Meteorological Agency earlier estimated the quake's magnitude at 5.2.

No abnormalities were detected at the Sendai nuclear power plant in Kagoshima Prefecture, according to the operator Kyushu Electric Power Co.

There were no reports of delays on shinkansen bullet train services, according to Kyushu Railway Co.

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