Amplification of obliquely incident seismic waves by cylindrical alluvial valley of arbitrary cross-sectional shape. Part II. Incident SH and rayleigh waves

Abstract

Amplification of ground motion in three dimensions due to cylindrical alluvial valleys of arbitrary cross section is investigated in this paper. The incident wave is either a plane SH or Rayleigh wave, propagating at an arbitrary angle to the axis of the valley. A hybrid numerical method combining boundary integral representation and finite element discretization has been employed. Numerical results show significant amplification depending on the angles of incidence and geometries of the valleys.