TOKYO, Japan (CNN) -- A strong earthquake centered about 90 miles off Japan's east coast, measuring a 6.5 magnitude, was recorded by seismologists at the U.S. Geological Survey (USGS) on Saturday.
There were no immediate reports of damage from the quake, which happened at 7:29 p.m. (5:29 a.m. ET).
The quake was centered at a depth of 10 kilometers (6.2 miles) underground and 170 kilometers (105 miles) east of Mito, on the main Japanese island of Honshu, the USGS said.
Tokyo is about 255 kilometers (160 miles) west-southwest of the quake's center, the agency said.