An earthquake with a magnitude of 5.5 jolted the islands of Shikine and Kozu in the Izu Islands chain south of Tokyo on Monday morning, the Meteorological Agency said.
There have been no reports of casualties, but the agency warned of landslides due to a recent series of temblors that have loosened soil on the islands.
A magnitude 5 quake can damage homes if it occurs in a residential area.