Joint Autocorrelation and Receiver Function Analysis of Sedimentary Structures Using Strong Ground Motion Records
Pure and Applied Geophysics(2022)
摘要
Joint analysis of the receiver and autocorrelation functions was performed to estimate the structure of the P- and S-wave velocities V P and V S as well as the depth to the seismic bedrock using strong motion records obtained in Narita, Kanto basin, Japan. From data of over 1000 P-waves and their coda induced by local seismic events, the autocorrelation revealed a clear reflection in the sedimentary layer, and the receiver function revealed clear Ps and PpPs converted phases at the seismic bedrock. The sediment thickness and V S were measured from the H – κ stack of the vertical and transverse components of the autocorrelation and the Ps and PpPs phases in the receiver function. The previous V S structure model obtained with only the transverse autocorrelation in Narita was found to be appropriately evaluated, whereas the corresponding V P structure model must be improved. Because the H – κ stack requires an assumed V P value, an appropriate value of V P is crucial for accurate estimation of V S and the thickness of the sediment. Thus, the frequency analysis of the H – κ – V P stack was performed to estimate V P , V S , and the thickness of the sedimentary structure. From the results of this analysis, V S was determined to have been estimated appropriately for the present case in Narita. However, V P had been estimated to be lower than the value estimated by this study. It is clear that an appropriate assumption of V P is important to capture the Ps and PpPs phases in the receiver function.
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关键词
Body waves,earthquake,ground motion,autocorrelation,receiver function,sedimentary structure
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