WAVEFORMS OF SCATTERED WAVES GENERATED AT AN IRREGULAR GROUND SURFACE

Abstract

It has been pointed out that ground with an irregular surface causes complicated seismic responses. However, the process of generating this complex response is not yet clear. In this study, it was pointed out that the mathematical expression of scattered-wave contribution has a form similar to that of the Huygens-Fresnel principle, and the expression consists of a wave function and an inclination factor. Next, the waveforms of the scattered waves from various parts of a ground surface were calculated and compared with those of the ground motions. This comparison showed that the waveforms of the ground motions at the surface can be decomposed into the waveforms of an incident wave and scattered waves, and the polarity and amplitudes of the scattered waves are primarily attributed to the inclination factor.