Three Dimensional Amplification of Seismic Waves by Alluvial Valleys of Arbitrary Shape. Part 1. Incident P and SV Waves

摘要

This paper investigates amplification of ground motion in three dimensions due to arbitrarily shaped cylindrical alluvial valleys. A hybrid numerical method combining integral representation and finite element discretization is employed. The incident wave is either a plane P or SV wave, propagating at an arbitrary angle to the axis of the cylindrical valley. Numerical results showing significant dynamic amplification are presented for various angles of incidence and two different geometries of the valleys. Keywords: Seismic wave propagation; Ground motion amplification; Mathematical models. (EDC)