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Tsunami Alert Follows Sharp Japan Aftershock January 7, 2011
Quake Map of Japan
One of the strongest aftershocks to date of Japan’s March 11 great earthquake rocked a wide area of the country late on Thursday evening.

A local tsunami alert was issued for the northeast coast after the 7.1 magnitude quake shook the region for more than 30 seconds at 11:32 p.m. local time.

No significant changes in sea level were detected, and the alert was lifted within a couple of hours, according to the Japan Meteorological Agency.

There were also no reports of significant damage from the aftershock, which awakened people in Tokyo, more than 200 miles from the epicenter.

Officials assured nervous residents that there was no additional damage to the Fukushima No. 1 Nuclear Power Plant, and recovery efforts there were continuing normally.