A 6.7-magnitude earthquake struck the southern fringes of the Izu Island chain off Honshu on Sunday, the Meteorological Agency said, but no tsunami warning was issued and no injuries or damage were reported.
The quake struck close to Torishima Island at 12:22 p.m., about halfway from Tokyo to Iwoto (formerly Iwojima), at a depth of about 450 km.
The Meteorological Agency said there was no risk of a tsunami.
Despite the depth and distance, Tokyo and the rest of the Kanto region felt minor tremors from the quake.
Later in the day, a 4.2-magnitude earthquake struck Fukushima Prefecture at 7:27 p.m., the agency said.
The quake registered 4 on the Japanese seismic intensity scale of 7 in the city of Aizuwakamatsu and the village of Konan in Koriyama, Fukushima Prefecture.