Energy Dynamic Characteristics of Seismic Wave Propagation in Bedrock and Overburden Layer Slope

Abstract

When a seismic wave propagates through a bedrock cover discontinuity, mutations in seismic wave propagation characteristics occur owing to reflection and transmission. In this study, based on the medium model and motion equation, the medium of the bedrock and overburden layer slope were connected by boundary conditions, the variation law of the seismic wave reflection and transmission coefficients at the bedrock cover discontinuity were analyzed, and the attenuation characteristics of the energy of the bedrock and overburden layer slope were studied. It was concluded that the transmission coefficients of the P, SV, and SH waves decreased with increasing incident angle. Further, with increasing incident angle, the reflection coefficients of the P and SH waves first decreased and then increased, whereas that of the SV wave first increased and then decreased. When the incident angle was constant, the attenuation of the seismic wave energy by the bedrock cover interface was directly proportional to the attenuation ratio of the interface. Thus, the attenuation of seismic wave energy first increased and then decreased with increasing incident angle.