A COMPARATIVE STUDY ON SEISMIC WAVE METHODS FOR MULTI-LAYERED MEDIA WITH IRREGULAR INTERFACES:IRREGULAR TOPOGRAPHY PROBLEM
用于不规则界面多层介质的地震波方法比较研究：不规则地形问题

Through studies on the scattering from various topographies due to an incident SH wave, three methods for seismogram synthesis (Aki Larner method, Bouchon Campillo method, and global generalized R/T matrices method) are evaluated in terms of the accuracy of the results, numerical stability and computational efficiency. Using the FFT algorithm, the Aki Larner method is the most efficient of the three methods, but is least accurate because of the limitation of the Rayleigh hypothesis. The Bouchon Campillo method is quite accurate and stable, but has the lowest efficiency;moreover it cannot treat very steep topography precisely. The global generalized R/T matrices method not only is very accurate, stable and with a modest computational efficiency, but also can treat the very steep topography well. Therefore, the global generalized R/T matrices method is the best method among the three, and provides a very effective tool to synthesize seismograms for complex media.