Numerical Simulations of the 2011 Tohoku,Japan Tsunami Forerunner Observed in Korea using the Bathymetry Effect

摘要

The 2011 Tohoku,Japan Tsunami,which occurred on March 11,2011,reached the Korean Peninsula and was recorded at numerous tide stations.In the records of the north-eastern tide stations,tsunami forerunners were found in only about a few minutes after the earthquake,which was much earlier than the expected arrival time based on a numerical simulation.Murotani et al.(2015) found out that the bathymetry effect is related to the tsunami forerunners observed in Japan and Russia.In this study,the tsunami forerunners observed in Korea were well reproduced by a numerical simulation considering the bathymetry effect.This indicates that it is important to consider the bathymetry effect for a tsunami caused by an earthquake on shallowly dipping fault plane(e.g.2011 Tohoku,Japan Earthquake).However,since the bathymetry effect requires additional computation time,it is necessary to examine the problems that results from applying the bathymetry effect to the tsunami warning system.