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A very broad‐band stochastic source model used for near source strong motion prediction
Author(s) -
Berge Catherine,
Gariel JeanChristophe,
Bernard Pascal
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl00732
Subject(s) - seismogram , wavenumber , geology , computational physics , physics , kinematics , frequency band , discretization , strong ground motion , fault (geology) , range (aeronautics) , near and far field , optics , seismology , computer science , mathematical analysis , ground motion , mathematics , classical mechanics , telecommunications , materials science , bandwidth (computing) , composite material
The simulation of near‐source ground motion requires the calculation of ground motion in a very broad‐band frequency range (typically from 10 s to 0.1 s ). However, the calculation of complete Green's function is too time consuming for high‐frequency simulations. We present a method to obtain very broad‐band synthetic seismograms, combining the kinematic spectral source model of Bernard et al., [1996], and an algorithm, based on the wavenumber technique of Bouchon and Aki, [1977]. High‐frequency radiations are evaluated with ray theory and a broad‐band dislocation defined on a finely discretized fault plane. The low‐frequency radiations due to the near‐ and intermediate‐fields are calculated with the complete field algorithm on a low‐wavenumber filtered dislocation. This dislocation is defined on a coarse grid over the fault, hence significantly reducing the computing time. We apply this method to compute the ground motion at a station located near an extended fault, where the near‐, intermediate‐ and far‐field radiations are important.