Simulating and Analyzing Artificial Non-Stationary Earthquake Ground Motions; Seismic Safety Margins Research Program

摘要

This report describes models used to simulate and analyze real and artificial earthquake accelerograms. Several new research findings are included. Artificial accelerogram records are generated by a class linear difference equations which have been previously identified as suitable for decribing strong ground motions. The authors use a model whose white noise forcing function is modulated by an envelope representing the time-dependent variance. Using this model, the authors design a numerical technique which reliably generates a non-parametric estimate of the variance envelope and of the noise generating a real or artificial earthquake.