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On Thursday, March 10, 2011 there was a series of at least 24 earthquakes ranging from magnitude 4.4 to 6.4 in the region of Japan. These foreshocks were the precursor to the main event -- a 9.0 earthquake on March 11, 2011. Foreshock activity has been detected for about 40 % of all moderate to large earthquakes, and up to 70% for magnitude events >7.0.

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