On March 11, 2011, the Tohoku Earthquake occurred off the coast of the Tohoku Region of northeastern Japan. This report clarifies the impact on dams of this earthquake, which is the largest to occur in the history of Japan, outlines the results of special safety inspections performed immediately after the earthquake by dam managers, and summarizes the results of later detailed in-situ investigations by expert dam engineers. It also describes the characteristics of earthquake motion records observed at dams during this earthquake, and discusses future prospects for evaluating the seismic performance of dams during large earthquakes.
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