Abstract:

In order to simulate wave field generated by random sources and provide theoretic reference for research and application of microtremor,microtremor is simulated using staggered-grid finite difference method. The composition of surface waves in the simulated microtremor is estimated based on the distribution of sources in the measured area according to the generation mechanism of Rayleigh wave and Love wave. First, we establish a numerical model for simulation of microtremor using staggered-grid finite difference method and then provide formulas to estimate the composition of surface waves. Finally, the record of microtremor is synthesized using typical methods and dispersion curves of surface waves in the simulated microtremor are extracted by spatial autocorrelation method for comparison. The results show that staggered-grid finite difference method can simulate microtremor better.

Key words: staggered-grid, finite difference method, microtremor, surface waves, dispersion curve