| 微动中多模式面波频散曲线的映射式提取方法 |
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| 引用本文： | 周晓华,林君,张怀柱,焦健.微动中多模式面波频散曲线的映射式提取方法[J].地球物理学报,2014,57(8):2631-2643. |
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| 作者姓名： | 周晓华 林君 张怀柱 焦健 |
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| 作者单位： | 1. 吉林大学仪器科学与电气工程学院, 地球信息探测仪器教育部重点实验室, 长春 130061;2. 吉林大学地球探测科学与技术学院, 长春 130061 |
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| 基金项目： | 国家自然科学基金(41204069)资助 |
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| 摘 要： | 为了避免微动勘探技术中因忽略高阶模式瑞雷波而影响反演精度的不足，提出从微动面波中提取多模式瑞雷波频散曲线的映射式方法.该方法从微动信号入手，首先通过相关法提取多半径台阵的相关系数曲线，然后建立从多条相关系数曲线到多模式瑞雷波频散曲线的映射模型，最后采用分区拟合准则优化实现模型结构，达到提取微动面波中多模式瑞雷波频散曲线的目的.为验证方法的有效性，通过有限差分方法数值计算实际近表面应用中三种常见典型地质结构中的微动信号，采用映射式方法提取微动面波中多模式瑞雷波频散曲线，将提取结果和理论值进行对比分析.结果表明，映射式方法提取微动面波中多模式瑞雷波频散曲线可以满足反演地质结构的要求.
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| 关 键 词： | 微动 频散曲线 多模式 多半径台阵 映射 |
| 收稿时间： | 2013-05-07 |
Mapping extraction dispersion curves of multi-mode Rayleigh waves in microtremors |
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| ZHOU Xiao-Hua,LIN Jun,ZHANG Huai-Zhu,JIAO Jian.Mapping extraction dispersion curves of multi-mode Rayleigh waves in microtremors[J].Chinese Journal of Geophysics,2014,57(8):2631-2643. |
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| Authors: | ZHOU Xiao-Hua LIN Jun ZHANG Huai-Zhu JIAO Jian |
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| Institution: | 1. Key Laboratory of Earth Information Detection Instruments, Ministry of Education, College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China;2. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130061, China |
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| Abstract: | 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. |
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| Keywords: | Microtremor Dispersion curve Multi-mode Rayleigh wave Multi- radius array Mapping |
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