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LABORATORIE DE GEOPHYSIQUE INTERNE, (ERA CNRS N°603), IRIGM, BP 53 X, GRENOBLE, France
Abstract
Green's functions for an elastic layered medium can be expressed as a double integral over frequency and horizontal wavenumber. We show that, for any time window, the wavenumber integral can be exactly represented by a discrete summation. This discretization is achieved by adding to the particular point source an infinite set of specified circular sources centered around the point source and distributed at equal radial interval. Choice of this interval is dependent on the length of time desired for the point source response and determines the discretized set of horizontal wavenumbers which contribute to the solution. Comparisons of the results obtained with those derived using the two-dimensional discretization method (Bouchon, 1979) are presented. They show the great accuracy of the two methods.
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J. E. LUCO and R. J. APSEL On the Green's functions for a layere |
