Pattern search algorithms for nonlinear inversion of high-frequency Rayleigh-wave dispersion curves

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• 作者：Xianhai Song ; Hanming Gu ; Xueqiang Zhang ; Jiangping Liu
• 关键词：Pattern search algorithms ; Generalized pattern search ; Surface waves ; Rayleigh waves ; Dispersion curves
• 刊名：Computers and Geosciences
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：34
• 期：6
• 页码：611-624
• 全文大小：263 K

文摘

Inversion of Rayleigh wave dispersion curves is challenging for most local-search methods due to its high nonlinearity and to its multimodality. In this paper, we implemented and tested a Rayleigh wave dispersion curve inversion scheme based on GPS Positive Basis 2N, a commonly used pattern search algorithm. Incorporating complete poll and complete search strategies based on GPS Positive Basis 2N into the inverse procedure greatly enhances the performance of pattern search algorithms because the two steps can effectively locate the promising areas in the solution space containing the global minima and significantly reduce the computation cost, respectively.