A powerful 7.6 magnitude earthquake shook northern Japan on Dec. 8 and prompted a tsunami warning, officials said. The Japan Meteorological Agency said a tsunami as high as 10 feet could hit Japan's northeastern coast. The epicenter of the quake was 50 miles off the coast of Aomori prefecture, at a depth of 30 miles, the agency said.

A powerful, magnitude-7.0 earthquake struck in a remote area near the border between Alaska and the Canadian territory of Yukon on Saturday.