While studying a huge earthquake that struck Niigata , Japan , in 1964 , Dr. Aki devised a calculation that considers the area affected by an earthquake , the rigidity of the underlying rock and the distance the rocks slip .
Japan /location/location/contains Niigata
IN VBG DT JJ NN WDT VBD NNP , NNP , IN CD , NNP NNP VBD DT NN WDT VBZ DT NN VBN IN DT NN , DT NN IN DT VBG NN CC DT NN DT NNS VBP .
Japan
LOCATION
Niigata
LOCATION
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