| 地脉动空间自相关方法反演 浅层S波速度结构 |
| |
| 引用本文： | 刘庆华,鲁来玉,何正勤,胡刚,王凯明,龚艳.地脉动空间自相关方法反演 浅层S波速度结构[J].地震学报,2016,38(1):86-95. |
| |
| 作者姓名： | 刘庆华 鲁来玉 何正勤 胡刚 王凯明 龚艳 |
| |
| 作者单位： | 1.中国北京 100081 中国地震局地球物理研究所 |
| |
| 基金项目： | 国家自然科学基金41174041 |
| |
| 摘 要： | 在近地表地球物理领域， 基于地脉动(或称背景噪声)提取的面波频散曲线反演地下S波速度结构是一种简单经济的工程勘察方法. 本文基于地脉动的空间自相关方法对一个微型台阵观测的背景噪声记录进行处理， 介绍了一种简单易行的提取频散曲线的数据处理方法， 获得了6.7—23 Hz频段的可靠频散曲线; 通过对该观测频散曲线与预测模型的频散曲线进行拟合， 反演得到S波速度结构. 结果表明， 该速度结构与钻孔直接测试的结果相吻合.
|
| 关 键 词： | 地脉动 空间自相关(SPAC)方法 频散曲线 面波反演 S波速度结构 |
| 收稿时间： | 2015-04-26 |
Inversion of S-wave velocity structure near the surface by spatial autocorrelation technique of microtremors |
| |
| Institution: | 1.Institute of Geophysics， China Earthquake Administration， Beijing 100081， China2.Earthquake Disaster Mitigation Bureau of Tonghai County， Yunnan Yuxi 652799， China |
| |
| Abstract: | In the field of near surface geophysics， the inversion for the velocity structure based on the dispersion of surface waves extracted by spatial auto-correlation (SPAC) of microtremors is a simple and reliable geotechnique scheme. This paper deals with the ambient seismic noise recorded by a circular array， and introduces a simple method to extract the dispersion curve of surface wave by processing the SPAC coefficients properly. The reliable dispersion curves in the frequency range of 6.7—23 Hz are extracted. The S-wave velocity structure is obtained by fitting the observed dispersion curves with predicted ones. The structure by inversion agrees well with that obtained by drilling test under the array. |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地震学报》浏览原始摘要信息 |
| 点击此处可从《地震学报》下载免费的PDF全文 |
