HYBRID SIMULATION OF SEISMIC WAVE PROPAGATION IN LATERALLY INHOMOGENEOUS MEDIA

摘要

The main aim of this work is to develop, validate and applied in simulation study an efficient hybrid approach to study 2D seismic wave propagation in local multilayered geological region rested on inhomogeneous in depth half-space with a seismic source. Plane strain state is considered. The vertically varying of the soil properties in the half space is modelled by a set of horizontal flat isotropic, elastic and homogeneous layers. The finite local region is with nonparallel layers and with a free surface relief. The hybrid computational tool is based on the analytical wave number integration method (WNIM) and the numerical boundary integral equation method (BIEM). The WNIM is applied considering the bedrock model to compute the input signals for the laterally varying part where the signals are obtained by BIEM at a set of sites. The numerical simulation results reveal that the hybrid method is able to demonstrate the sensitivity of the obtained synthetic signals to the seismic source properties, to the heterogeneous character of the wave path and to the relief peculiarities of the local stratified geological deposit.