Dec. 8 (UPI) -- A 7.5 -magnitude earthquake struck the northernmost prefecture of Japan's main Honshu island on Monday night, and tsunami warnings were lifted several hours later.

The quake hit northeastern Japan off the eastern coast of Aomori Prefecture, about 50 miles northeast of Hachinohe, at 1:15 p.m. Monday local time at a depth of 0.9 miles, Japan Meteorological Agency said.

More than 20 people reportedly were injured.

The U.S. Geological Survey listed it as 7.6 with an aftershock of 6.6 reported 7 1/2 hours later, about 78 miles south of Honcho. Several other aftershocks were reported.

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