抄録
A new method topredict a long-period ground motion due to arbitrary seismic source was developed. In the method, the ground motion due to an earthquake is generated from the ground motion record due to other earthquake by using the transfer function defined as the spectral ratio between the theoretical ground motions due to each earthquake. The theoretical ground motions are simulated based on a soil structure model by 3D finite difference method. In addition, a technique to compute the Green’s functions giving the ground motions at a station by arbitrary seismic sources based on the reciprocity theorem is used in order to reduce calculation load. Applying the new method to three earthquakes, it was suggested that the ground motion record of a small earthquake is accurately scaled up to that of a large earthquake.
