DETECTION METHOD OF P-TO-S CONVERTED WAVES FROM SEISMIC BEDROCK USING ALL-PASS FUNCTION DECONVOLVED FROM RECEIVER FUNCTION

Abstract

A method to detect P-to-S converted waves from seismic bedrock is proposed and applied to strong motion records observed at two KiK-net stations. In this method, receiver function RF derived from radial-to-vertical spectral ratios for P-waves is deconvolved to minimum-phase-shift function and all-pass function. The all-pass function (all-pass RF) has liner phase and so it is purely reserved the PS-P time, which is time difference between P-to-S converted waves and P waves. Consequently all-pass RF has a clear peak at a PS-P time. It is shown using the strong motion records that the PS-P time is well estimated from all-pass RF of each record without stacking of many records.