摘要
开展了不同传感器台网震源定位实验,分析了不同传感器台网布设下的震源定位误差分布规律,研究了震源定位双曲线域的非均匀特性,揭示了传感器台网对震源定位的作用机制.研究表明:传感器台网同时影响震源定位求解系统的稳定性和定位精度,而且传感器台网对震源定位结果的影响具有非均匀性;监测区域中不同位置的震源定位精度和稳定性各不相同,传感器台网内部的震源定位精度和稳定性都高于外部震源;随着震源远离台网中心,定位精度和稳定性都呈下降趋势,且当震源到达传感器台网边缘和台网外部的区域时,震源定位精度和稳定性的下降速率急剧增加;基于震源定位双曲线控制方程研究揭示了震源定位双曲线域的非均匀特性,传感器台网通过放大波速和到时等输入数据误差影响震源定位结果,且震源定位双曲线域的非均匀特性导致传感器台网对输入数据误差的放大效应是非均匀的,这种非均匀的放大效应是震源定位精度和稳定性依赖于震源和传感器台网相对位置的重要原因.
Two different sensors network layouts of source location laboratory experiments were designed and carried out.The source location error distribution law of the different sensors network layouts was analyzed,the non-uniformity characteristic of hyperbolic field was studied,and the mechanisms of the sensors network layouts for the source location were revealed.The results show that sensors network layouts affect both the source location accuracy and the source location solving system,and the influence of the sensors network layouts on source location results are non-uniformity.The accuracy and stability of the source locations depend on where the sources are in the sensors network layouts.Both the source location accuracy and stability inside of the network are higher than outside of the network.The accuracy and stability of the source locations consistently reduce along with the source away from the network center,and the down trend increases significantly when the sources move away from the edge of the network layouts.Based on the arrival-time-difference source location theory,the non-uniformity characteristic of hyperbolic field is revealed.The sensors network layouts affect the source location results by transferring the velocity and arrival time errors that already exist.More importantly,these errors transfer effect caused by the non-uniformity characteristic of hyperbolic field also has non-uniformity and amplification characteristics.This non-uniformity and amplification characteristics are the most important reason why the source location accuracy and stabilitydepend on the relative position of the sources and sensors network layouts.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2017年第2期229-236,共8页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51504250)
江苏省自然科学基金项目(BK20150183)
中央高校基本科研业务费专项资金项目(2015QNA58)
煤炭资源与安全开采国家重点实验室自主研究课题(SKLCRSM14X04)
关键词
微震/声发射
传感器台网
震源定位
双曲线域
非均匀特性
放大效应
microseismic/acoustic emission
sensors network layouts
source location
hyperbol ic field
non-uniformity characteristic
amplification effect
