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| | Abstract | | Shallow surface layers are usually excluded in 3D numerical simulations of earthquake ground motion in a large basin, because of limitations of computational resources. The effects of shallow soil layers are, therefore, estimated by multiplying 1D amplification factors of shallow soils to synthetic motion for 3D basin model having no shallow soils. We investigated the effects of shallow soils by comparing synthetic motion calculated for basin models with and without shallow soils layers. The large parallel computer is used in the calculations with 900 CPUs. The shallow soils affect ground motion so much at periods less than 2 seconds at irregular parts of the shallow basin, because of generation of surface waves. |
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