Scattering of seismic waves by three-dimensional large-scale hill topography simulated by a fast parallel IBEM

摘要: To solve seismic wave scattering by a large-scale three-dimensional (3-D) hill topography, fast parallel indirect boundary element method (IBEM) is developed proposing new construction for the field, modifying generalized minimum residual (GMRES) algorithm and constructing an OpenMP plus MPI model. The validations of accuracy efficiency show that this can 3-D response topography broadband waves, overcome weakness large storage low traditional IBEM. Based on architecture, taking plane SV waves Gaussian-shaped thousands-meters height as example, influence several important parameters investigated, including incident frequency, angle height-width length-width ratio hill. numerical results illustrate amplification effect ground motion near-hemispherical more significant than narrow For low-frequency higher pronounced, there only single peak near top However, high-frequency rapid spatial variation displacement amplitude appears surface.