Two Distinguished Effects of the 2011 Great Tsunami to the Coasts along Sendai Bay : Damage to Arahama and Trench Formation behind the Dike on Yamamoto Coast(<Featured Articles>Mega-Earthquake and Geomorphic Hazards)

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A great earthquake with a magnitude of 9.0 occurred on March 11, 2011 with an epicenter 130 km offshore of the Oshika Peninsula in Miyagi Prefecture. After the earthquake, a great tsunami inundated east Japan's coastline extensively. We carried out field observations to investigate the damage to Arahama and the formation of a trench as a result of local scouring by jet flow over the coastal dike. Here, the results of the field observations on the inundation of the tsunami into a wide residential area in Arahama were reported. Then, the destruction of the coastal dike, as well as the formation of a large trench immediately behind the coastal dike due to the tsunami overflow on the Yamamoto coast, was investigated, where the tsunami height reached up to 19.2 m above mean sea level (MSL), estimated from the run-up height on the slope of a hill.
2012-10-25