Author(s)

D. Clouteau & D. Aubry

Abstract

During earthquakes it is classical to observe strong variations of the ground motion at different locations of a given site. Many studies have dealt with these phenomena for valleys but mountains have been less studied especially in 3D. This paper tries to quantify these topographic effects and to evaluate the differences between 2D and 3D responses for mountains having ellipsoidal shapes. The proposed modelling procedure uses Boundary Element Method with the Green functions of the half-space and a substructuring technique. Results are given both in the time and in the frequency domain. Introduction During earthquakes it is classical to observe strong variations of the ground motion at different locations of a given site [1]. These variations are due either to material heterogene

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