A magnitude 4.6 earthquake hit southern Gunma Prefecture on Sunday, causing some property damage but so far no reports of injuries have been confirmed.
The 3:27 p.m. quake, which occurred at a depth of 14 km and posed no tsunami risk, registered lower 5 on the Japanese seismic intensity scale of 7 in Shibukawa, the Meteorological Agency said.
It caused windows to break at a gas station in Shibukawa. A worker there said he felt a strong jolt from below the ground at the time of the quake.
The operation of bullet trains running through the prefecture was suspended following the quake but service was resumed shortly afterward after no safety problems were detected.
No abnormalities were found at Japan Atomic Power Co.'s inactive Tokai No. 2 nuclear power plant in the village of Tokai, in Ibaraki Prefecture, according to the prefectural government. The quake recorded 3 on the Japanese scale in parts of the prefecture.
The government set up a liaison unit at the crisis management center of the Prime Minister's Office to gather information on the temblor.