An estimated 4.5-magnitude earthquake centered in Nagano Prefecture hit the central and western parts of Japan early Sunday morning, the Meteorological Agency said.
There were no immediate reports of damage or casualties from the 3:23 a.m. quake, which originated in the southern part of Nagano Prefecture. No tsunami alert was issued.
The quake registered 4 on the Japanese intensity scale to 7 around the foot of Mount Ontake in southwestern Nagano Prefecture. The intensity rating was 3 in areas farther from the mountain and in eastern Gifu Prefecture.
The quake was also felt in Shizuoka, Aichi, Shiga, Kanagawa, Toyama, Ishikawa, Fukui, Yamanashi, Mie, Kyoto, Osaka, Hyogo and Nara prefectures.
It was followed by several aftershocks registering 1 and 2 on the Japanese scale in southwestern Nagano Prefecture.