A strong earthquake with a magnitude of 6.8 on the Richter scale shook the northern part of Japan's main island early on Friday, and was followed by another, more restrained shake. There were no reports of injuries or damage. A magnitude 6.8 quake is strong enough to do considerable damage in populated areas. But Friday's temblor was centered offshore, which was believed to have softened its impact. Officials warned residents to stay away from the shoreline because of possible tsunami - ocean waves generated by seismic activity. Shortly after the quake, a tsunami of about 12 inches was recorded.

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