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 magnitude 7.6 earthquake struck off Japan’s northeastern coast late Monday, triggering a tsunami warning of up to 3 meters for Hokkaido, Aomori, and Iwate prefectures, the Japan Meteorological Agenc...

Warnings were issued for the prefectures of Hokkaido, Aomori and Iwate, and tsunamis from 20 to 70 cm (7 to 27 inches) high were observed at several ports, JMA said.