Wave Propagation In An Elastic
Half-space Containing A Homogeneous
Basin Using The MFS
Author(s)
L. Godinho, A. Tadeu & F. J. Branco
Abstract
The propagation of elastic waves in layered half-space media containing a
homogeneous basin can be simulated using different approaches. The present
work proposes a methodology based on the Method of Fundamental Solutions
(MFS) that makes use of the fundamental solution for a 2.5D elastic layered halfspace.
The basin is modelled as an elastic material, whose properties are different
from those of the host media. The proposed model is formulated in the frequency
domain, and time responses are obtained by inverse Fourier transformation.
Complex frequencies are used to avoid aliasing phenomena. The method is
applied to study the case of a half-space with a semi-circular alluvial basin,
illuminated by a point load, for which time signals are computed.
Keywords: MFS, seismic waves, half-space, basin.
1 Introduction
It is well known that site effects influence the nature of strong ground motion,
causing, in specific situations, marked amplification phenomena (see Sanchez-
Sesma [1]). Among other factors, surface topography is known to produce these
so-called site effects, and there is significant evidence of the ground motion
amplification it generates. Different approaches have been used to simulate the
propagation of seismic waves in the presence of specific topographical
deformations. Pedersen et al [2] used an indirect Boundary Element Method
(BEM) formulation to calculate the three-dimensional seismic response of twodimensional
topographies, under the influence of plane waves, using Green’s
functions for an infinite space. Reinoso et al [3] used a BEM formulation to
compute the 3D reflections by valleys and irregular topographic deformations.
Keywords
MFS, seismic waves, half-space, basin
Related Book
Other papers in this volume
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