From P Wave Attenuation to Study 2006 Taitung Earthquake

From P Wave Attenuation to Study 2006 Taitung Earthquake

Amplitude attenuation and attenuation dispersion are the two main methods used in the study of seismic wave attenuation, especially the attenuation dispersion obtained from single stations. When the seismic wave is propagating, its geometric spread and inelastic absorption would affect the amplitude as well as related factors such as the rock porosity, lithology, temperature and pressure conditions, rock particle size, viscosity, and the saturation of the medium. According to the continuous relaxation model, based on the assumption that the attenuation material is a linear viscoelastic solid, we picked up the first cycle of the P arrival wave from the vertical component in a single station to calculate the delay time of the group velocity using the multiple filter technique and then adopted the Genetic Algorithm(GA) method to investigate the related parameters of the Qp value. In this study, we calculated the temporal variation of Qp with the stations near to the 2006 Taitung earthquake epicenter(M6.2). We explored each quadrant of the Qp value changes with different stations and the consistency in different orientations of the stations. The results confirmed each other to enhance the observable characteristics of strong earthquake forecasting.