If three major earthquakes were to occur simultaneously off the Pacific coast of central and western Japan, tall buildings in Tokyo and Osaka could rock far longer than they did during the magnitude-9 temblor that hit the Tohoku region in March 2011, according to researchers.
Scientists at the Center for Integrated Disaster Information Research at the University of Tokyo said Monday that three magnitude-8.7 quakes occurring simultaneously in the area could trigger slow and long ground motions of the type that impact buildings located far from the epicenters.
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