Amplification of ground motion in three dimensions due to arbitrarily shaped cylindrical alluvial valleys is investigated in this paper. A hyrid numerical method combining boundary-integral representation and finite-element discretization has been 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.

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