Comparison Of FK And Spac Methods In Determining Dispersion Curves From Passive Surface Wave

FK and SPAC are the two common approaches in determining dispersion curves from passive surface waves. To conduct a systematic comparison, we stimulate passive surface waves with randomly distributed sources and different types of arrays. A field data is also used in the comparison. The study shows that the SPAC method provides higher resolution on the dispersion image and is able to generate a dispersion curve with a larger frequency range. The FK method performs well within a limited frequency range. To reduce the uncertainty in determining dispersion curves, the combination of both methods is recommended.