深い地盤構造評価のためのPS変換波の検出方法に関する検討

概要

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P to S converted waves generated at the surface of seismic bedrock are useful for estimating deep underground structures, because the difference in arrival time between P to S converted waves and direct P waves, that is, PS-P time depends only on velocity structures of sedimentary layers overlying the seismic bedrock. This paper investigates the applicability of receiver function method proposed by Langston to detect PS-P time from observed records of medium or small earthquakes. The receiver function is obtained by Fourier inverse transform of spectral ratio function of horizontal to vertical component in the P-wave part. By analyzing records observed at three sites, it is confirmed that the receiver function can detect PS-P time accurately, and is applicable to seismograms which do not have any noticeable phase of P to S converted waves. It is indicated that PS-P time has good correlation with periods of fundamental mode of S- and surface waves.
1998-03-30