Japan shaken by pair of strong earthquakes, USGS reports

Japan was shaken by a pair of strong earthquakes, the USGS reports.

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A magnitude 6.6 quake struck at approximately 3:07 a.m. Thursday and was followed by a magnitude 5.3 quake less than 20 minutes later. California time is 16 hours behind Japan.

No damage or injuries were immediately reported and no tsunami watch or warning was issued.

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