Parallel Algorithm and Simulation Code for Spatial-Varying Seismic Motion Methods

The simulation mechanism of seismic ground motion is presented in this paper, and the parallel numerical algorithm is applied as the attempt for the simulation of spatial seismic ground motion time histories on parallel computers, which is consistent with arbitrary response spectra from a specified target. The basic methods of simulation, which involve calculations of auto power spectra, phase difference spectra, cross power spectra, Fourier spectra, and response spectra, etc., are also within the discussions in this paper. According to these analyses, this paper presents a set of integrated methods for nonstationary seismic ground motion simulation with greater capacity of processing multiple spatial points. In additional, Parallel Seismic Ground Motion Simulator, the parallel program for artificial generation of seismic ground motion, has been developed, which is based on Message-Passing Interface and written in Fortran90, and also provides a user-friendly visualized interface based on a commercial finite-element-analysis preprocessor. The new interdisciplinary approach can not only improve scale and efficiency of simulation of the spatial stochastic field but also can provide a useful tool for simulation of seismic input load. Information for improving current seismic design codes is also presented.