The S and P Wave Velocity Structure under California, USA by Analyzing the Seismogram of C052297B Earthquake on SBC Station

We have investigated the S and P wave structure between Mexico and SBC station, California. The data that was used is from a C052297B event, Guerrero, Mexico; it was fitted to synthetic data. A low-pass filter is subjected to the seismograms with corner frequency of 20 mHz. Waveform analysis results show very unsystematic and strong deviation in the waveform. Discrepancies are met on S, Love, Rayleigh and ScS waves. We can see how sensitive the waveform is to structures within the layers of the Earth. To accomplish the discrepancies, the corrections was conducted for the crust thickness, gradient of h, the coefficient for the h and v in the upper mantle for surface wave fitting, a small variation of the S speed structure at a layer under the upper mantle above depth of 771 km from earth surface for S wave fitting, and a small variation at the base mantle layers (CMB) for ScS and ScS2 waves fitting.