Study of Seismic Anomalies in Crust from Observed Waveform Analysis

Study of Seismic Anomalies in Crust from Observed Waveform Analysis

In this study, we use P-wave dispersion and attenuation properties and the shear-wave splitting technique to detect seismic anomalies prior to an earthquake. The results show that P-wave dispersion of attenuation factor dQ(Q value will be at the epicenter of the linear regression to remove the effect) will be relatively high before an earthquake, the fast-shear-wave polarization angle of the S-wave changes after the earthquake, and the delay time will be increased. This study also discusses the 2012 ML=5.28 event that occurred in the Chiayi area near station CHN5 and the Meishan fault. Form analysis of the case study and the high seismic potential areas, we expect to identify the anomalies prior to a strong earthquake.