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The 2004 Mid-Niigata prefecture Earthquake (Mjma 6.8) occurred in the region of large strain rates (>0.1ppm/y contraction) in the intraplate region in Japan. The mainshock was followed by four major aftershocks with Mjma>=6.0. The hypocenters of the mainshock and two large aftershocks that occurred in the central part of the aftershock region were located near the lower limit of the earthquake...
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