EFFECT OF LATERALLY INHOMOGENEOUS GROUND ON SEISMIC INDICES

Abstract

To examine the effect of irregular underground structure on seismic ground motions, six twodimensional irregular underground structure models composed of a shallow surface layer and a basement layer were analyzed with 2D wave propagationmodels using the Finite Element Method. Analytical results in terms of Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), and instrumental seismic intensity show that ground motions at the surface are amplified due to the irregular underground structures.