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摘要
The conventional methods for extracting dispersion curves of Rayleigh waves in microtremors may ignore higher modes of Rayleigh waves, in which the inversion precision would be effected. In order to overcome this deficiency, we propose to extract dispersion curves of the multi-mode Rayleigh waves in microtremors by a mapping manner. This approach starts with the measured microtremor signal, extracts correlation coefficient curves of the multi-radius array using the correlation method, and then establishes the mapping model from correlation coefficient curves of the multi-radius array to dispersion curves of the multi-mode Rayleigh waves. Finally, it optimizes the mapping model through the zonal fitting criteria and then obtains dispersion curves of the multi-mode Rayleigh waves. To verify the validity of this method, microtremor signals are synthesized in three kinds of typical geological structures using the finite difference method, and dispersion curves of the multi-mode Rayleigh waves are extracted by mapping. Then the extracted values are compared with theoretical ones. The results show the dispersion curves of the multi-mode Rayleigh waves extracted using this mapping method can meet the requirements for inversion of geological structure.
- 出版日期2014-8
- 单位吉林大学
