IUGG 2003
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Name Ivo Oprsal
Affiliation Swiss Seismological Service, ETH Zurich, on leave from Faculty of Mathematics and Physics, Charles University in Prague, Czech Republic
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Co-Author - 1 Name Donat Faeh
Affiliation Swiss Seismological Service, ETH Zurich
Co-Author - 2 Name Domenico Giardini
Affiliation Swiss Seismological Service, ETH Zurich

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Abstract Title THREE DIMENSIONAL FINITE-DIFFERENCE MODELING OF STRONG GROUND-MOTION SITE EFFECTS DUE TO THE FINITE-EXTENT SOURCE - 1356 BASEL EARTHQUAKE, UPPER RHINE GRABEN
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The Basel earthquake of October 18, 1356 (I0=IX, M=6.9) is considered to be one of the most disastrous European events. The Basel area - Upper Rhine Graben - belongs today to seismically modest regions. Reducing the seismic risk by anti-seismic design needs the knowledge of the strong ground motion. The lack of the real data may be effectively estimated by numerical modeling using the finite differences (FD). The 3D explicit FD method is designed for topography models on irregular rectangular grids. The single-template approximation to the hyperbolic partial differential equation (PDE) is solved explicitly in the spatial and the time domain. The boundary conditions at the interfaces (including the topographic free surface) are satisfied via a treatment of the material parameters. The medium is Hooke's isotropic inhomogeneous body, with a particle-velocity dependent term added to the PDE to approximate viscoelastic behavior of the medium. The 3D FD modeling is computed for the recently established P and S-wave velocities structure of the Basel area (Kind, 2002), including the topography. The relatively simple finite-extent source features are combined with strong site effects. The finite-extent source is adjacent to the free surface, since the fault has been recognized through trenching on the Reinach fault. Several rupture histories are tested because the 1356 Basel earthquake source features are not possible to be determined. The macroseismic information of the Basel area as well as recently established 2D computations serve as a comparison to the results.

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