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Bulletin of the Seismological Society of America; April 1998; v. 88; no. 2; p. 393-399
© 1998 Seismological Society of America
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Computing topographical 3D site effects using a fast IBEM/Conjugate gradient approach

Carlos Ortiz-Alemán, Francisco J. Sánchez-Sesma, José L. Rodríguez-Zúñiga and Francisco Luzón

Centro de Investigación Sísmica A. C., Carr. al Ajusco 203, Col. H. de Padierna, Tlalpan 14200, México D.F., Mexico
Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, G.A. Madero 07730, México D.F., Mexico
Instituto de Ingeniería, UNAM Cd. Universitaria, Apdo. 70-472, Coyoacán 04510, México D.F., Mexico
Departamento de Física Aplicada Universidad de Almería, Cañada de San Urbano s/n, 04120 Almería, Spain

Abstract

We briefly review the basis of the indirect boundary element method (IBEM) and apply it to compute the seismic response of three-dimensional topographic features for incident P and S waves. The method is based on the integral representation for scattered and diffracted waves using single-layer boundary sources. This approach is called indirect because source strengths should be obtained as an intermediate step. Boundary conditions lead to a system of integral equations for surface's sources. The discretization is based on the approximate rectification of involved surfaces using circles. This allows simple numerical and analytical integration of the exact Green's function for an unbounded, homogeneous, isotropic elastic space. In previous work, the accuracy of this approach has been verified. However, a serious limitation comes from the maximum frequency of interest because the size of the coefficient matrix grows as the square of frequency, and it can be easily too large for problems of practical interest. To overcome this difficulty, various threshold criteria were designed taking advantage from the significant spatial decay exhibited by Green's functions. Fast approximate solutions were obtained by using sparse matrix computations. Encouraging results are presented.




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