Shigeru Seki, an Ibaraki police spokesman, said some trains in the Tokyo area were stopped to check for track damage. It was centered about 25 miles under the seabed in the Pacific Ocean, some 90 miles southeast of Tokyo, the agency said. Earthquakes that have been rattling the Izu island chain near Tokyo continued Friday. About 1,000 earthquakes were detected by the agency Friday, including quakes of 4.8 magnitude and 3.3 magnitude. There were no reports of injuries or damage on the islands.
Japan is one of the most earthquake-prone countries in the world.