Algorithm of Microseism Processing by the H/V Method to Estimate the Parameters of a Two-Layer Velocity Model Based on Surface Rayleigh Wave Ellipticity
The research develops the H/V method by designing a microseismic data processing workflow, which includes prefiltering, summation of amplitude spectra, calculation of the component spectrum ratio (H/V curve) and its inversion based on surface Rayleigh wave ellipticity curves. As a result of the algorithm, the resonance frequencies values, depth of the top of the bedrock, and S-wave velocity in the soil and bedrock are determined, tolerant to noise at the point of measurement. The search ranges of the solution to the inverse problem are evaluated using the results of processing active seismic data on refracted and surface waves. As a result of processing the H/V curves, distribution maps of the reconstructed parameters for the entire area of the vibroseismic test site near the settlement of Bystrovka, Novosibirsk oblast, are constructed. The depth of the top of the bedrock, calculated by different seismic methods, are highly correlated with each other. The distribution maps of the reconstructed parameters may apply for studying the near-surface section, estimating the depth of the top of the bedrock, determining the incremental seismic intensity by the seismic impedance method, or calculating synthetic earthquake accelerograms.
