基于分布式声波传感阵列的地震动事件定位可行性研究  

Feasibility study of seismic events positioning based on distributed acoustic sensing array

作　　者：刘威 朱鸿鹄[1,2,3] 张汉羽 王涛 于大勇[1] 李杰[1] 施斌[1] LIU Wei;ZHU Honghu;ZHANG Hanyu;WANG Tao;YU Dayong;LI Jie;SHI Bin(School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Nanjing University(Suzhou)High-Tech Institute,Suzhou 215123,China;Institute of Earth Exploration and Sensing,Nanjing University,Nanjing 210023,China;Institute of Deep-Sea Science and Engineering,Chinese Academy of Sciences,Sanya 572000,China)

机构地区：[1]南京大学地球科学与工程学院,江苏南京210023 [2]南京大学(苏州)高新技术研究院,江苏苏州215123 [3]南京大学大地探测与感知研究院,江苏南京210023 [4]中国科学院深海科学与工程研究所,海南三亚572000

出　　处：《中南大学学报（自然科学版）》2023年第5期1804-1813,共10页Journal of Central South University:Science and Technology

基　　金：江苏省自然科学基金资助项目(BK20211086);三亚崖州湾科技城科研项目(SKJC-2020-01-009);国家自然科学基金资助项目(42077235);中国科学院A类战略性先导科技专项子课题资助项目(XDA22040105)。

摘　　要：基于在云南省宾川县开展的现场试验,探究频率-波数分析技术应用于分布式光纤声波传感(DAS)数据处理的可行性,分析该技术在判断地震动事件所在方向的应用效果,在此基础上,探讨频率-波数分析法的偏差来源,并提出减小定位误差、提高分辨能力的措施。研究结果表明,DAS阵列的方向偏差为2.37°,相较于检波器阵列,其判断精确度更高。使用特殊设计的光缆提升应变的传递效率、使用锚固装置增强缆-土之间耦合效果以及改变DAS阵列的几何形态捕获多方向的震动信息等措施可以有效减少定位误差,提高分辨能力。Based on the field test carried out in Binchuan county,Yunnan Province,the feasibility using F-K analysis method to process distributed acoustic sensing(DAS) data was studied,and the application effect in judging the direction of seismic events was analyzed.On this basis,the source of deviation in positioning using F-K analysis method was discussed,and three methods to reduce the positioning error and improve the positioning resolution capability were proposed.The results show that the direction deviation of the DAS array is 2.37°.Compared with the dense seismic array,DAS has higher judgment accuracy.The methods such as using specially designed optical cables to improve the efficiency of strain transfer,using anchoring devices to enhance the coupling effect between the cable and soil,and changing the geometry of the DAS array to capture vibration information from multiple directions can reduce the positioning errors and improve the resolution.

关 键 词：分布式声波传感(DAS) 地球物理探测 分布式光纤传感(DFOS) 地震动事件定位 

分 类 号：P62[天文地球—地质矿产勘探]