Abstract
If the earthquake occurs, the tsunami information will be offered by Japan Meteorological Agency via TV or the internet. However, for rapid evacuation, it is better that the every people can judge whether the tsunami will be occurred or not. Furthermore it is better that the people at coastal area can know the variation amount of the sea surface at the coastal area when the tsunami will occur. We remake the judge criteria whether the tsunami will be occurred or not when the earthquake will occur. In this case, we thought the relationship between the seismic energy and the hypocenter depth. Secondary, the response rate between the earthquake ground and the sea surface at the seismic center was calculated by the horizontal numerical simulation. This result were compared with the hydraulic experiment. According to the result, the response rate in the 100km scale was set as 50 % to 60 %. Furthermore, the sea surface change from the seismic center to the coastal area was calculated by the Green's law method. This result was compared by the CADMAS-SURF2D. Finally, we make the sea surface variation amount map around Niigata prefecture by the tsunami. In this case, the earthquake magnitude was set as 7.8. According to the result, the variation amount of the sea surface at Niigata city will be less than 3 m.
