A practical study on an exploration technique using microtremors by spatial auto-correlation method

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Spatial auto-correlation method, which is the method to determine phase velocities of surface waves in microtremors, has a potential to estimate deep structure with small seismometer array because the detectable range of wavelength by spatial auto-correlation method is larger than by frequency-wavenumber method. The following results were investigated for a practical use of spatial auto-correlation method.1.Development of observation system using datalogger2.Improvement of spatial auto-correlation method to determine phase velocities with high accuracy using auto-regressive model.3.Discussion about seismometer array shape.4.Comparison of detectable range of wavelength using spatial auto-correlation method or frequency-wavenumber method.5.Improvement of spatial auto-correlation method to distinguish higher mode of surface waves in microtremors.