微动信号模拟及其在微动勘探中的应用  

Microtremor signal simulation and its application in microtremor exploration

作　　者：李传金 王强 渐翔 郑涛 詹素华 陈绍伟 LI Chuan-Jin;WANG Qiang;JIAN Xiang;ZHENG Tao;ZHAN Su-Hua;CHEN Shao-Wei(School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;Institute of Geotechnical Engineering,Fujian University of Technology,Fuzhou 350118,China;Key Laboratory of Underground Engineering in Universities of Fujian Province,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建理工大学土木工程学院,福建福州350118 [2]福建理工大学岩土工程研究所,福建福州350118 [3]福建理工大学地下工程福建省高校重点实验室,福建福州350118

出　　处：《物探与化探》2023年第4期1040-1047,共8页Geophysical and Geochemical Exploration

基　　金：中国科学院重点部署项目(ZDRW-ZS-2021-3-1);福建理工大学科研发展基金(GY-Z17157)。

摘　　要：对于简正振型叠加法合成的微动信号,使用空间自相关法计算的频散曲线与理论频散曲线对比,发现两者具有较好的一致性。模拟微动信号时涉及许多参数,这些参数对微动勘探开展具有重要意义。对这些参数进行了数值试验,试验结果表明:震源距离和台阵尺寸对结果有明显影响,在复杂地层情况下应考虑高阶面波,在安静的观测场地应用小尺寸台阵往往能获得更高频率的频散信息从而提高浅层分辨率。因此,在实际开展微动勘探时,应考虑震源分布、台阵尺寸和高阶面波等因素对勘探结果的影响。This study synthesized microtremor signals using the normal mode superposition.The dispersion curves of the synthesized mi-crotremor signals were calculated using the spatial autocorrelation method,and the calculated results agreed well with theoretical disper-sion curves.The simulation of microtremor signals involves many parameters,which are of great significance for microtremor exploration.As shown by results from numerical experiments of these parameters,the hypocentral distance and array size had a significant influence on the results.Moreover,high-order surface waves should be considered for complex strata,while small-size arrays tended to yield high-frequency dispersion information at quiet observation sites,thus improving the resolution of shallow strata.Therefore,it is necessary to consider the influences of hypocenter distribution,array size,and high-order surface waves on exploration results in microtremor explora-tion.

关 键 词：微动信号 简正振型叠加 微动勘探 频散曲线 空间自相关法 

分 类 号：P631[天文地球—地质矿产勘探]