基于背景噪声互相关技术的雅浦俯冲带海底地震仪时间校正  

Time correction of Ocean Bottom Seismometer(OBS) deployed at the Yap subduction zone using ambient noise cross-correlation

作　　者：郑宏 范建柯[1,3] Le Ba Manh 杨挺 李翠琳 王秀娟[1] 董冬冬 ZHENG Hong;FAN Jian-ke;Le Ba Manh;YANG Ting;LI Cui-lin;WANG Xiu-juan;DONG Dong-dong(CAS Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China;State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;Southern University of Science and Technology,Department of Ocean Science and Engineering,Shenzhen 518055,China)

机构地区：[1]中国科学院海洋研究所,中国科学院海洋地质与环境重点实验室,青岛266071 [2]中国科学院大学,北京100049 [3]青岛海洋科学与技术试点国家实验室,海洋地质过程与环境功能实验室,青岛266061 [4]同济大学海洋地质国家重点实验室,上海200092 [5]南方科技大学海洋科学与工程系,深圳518055

出　　处：《地球物理学进展》2020年第2期799-806,共8页Progress in Geophysics

基　　金：国家自然科学基金(41876043,41506059)资助.

摘　　要：由于电磁波无法在水中传播,导致海底地震仪(OBS)与全球定位系统(GPS)无法进行实时对钟,因此会产生一定的时钟漂移.而受船时、海况等影响,被动源OBS在回收后往往电量亏损,致使设备回收时并没有完成对钟,无法直接利用对钟前后的时钟漂移量进行线性校正.本文选取中国科学院海洋研究所2016-2017年间在雅浦俯冲带进行的长周期被动源OBS实验所获得的数据,利用背景噪声互相关方法对OBS进行了时间校正.结果发现,各OBS在经过一年左右时间的布放后,时钟漂移量在1~3 s之间,且基本呈线性趋势,将该结果平均分配到每天从而完成线性校正.另外,探讨了时钟的非线性漂移、误差源、参考台站的选取等因素对时钟准确度的影响,为OBS的数据处理进行了有益的探索.Clock synchronization cannot be finished in real-time between Ocean Bottom Seismometer(OBS)and the Global Positioning System, due to the block of seawater to the propagation of the electromagnetic wave. Thus, the clock drifting will occur during the deployment of OBS in the seawater. Meanwhile, limited by other factors, such as the ship’s schedule, and conditions of the sea, clock synchronization could not be finished due to power exhaustion of the recovered passive OBS. As a result, the general linear time correction can’t be implemented. From 2016 to 2017, an array of passive OBSs was deployed on both sides of the Yap Trench for long-term observation with the research vessel Kexue from the Institute of Oceanology, Chinese Academy of Sciences. In this study, time correction is conducted based on the data obtained by these OBSs and the ambient noise cross-correlation functions. The results show that the clock drifting of each OBS ranges from 1 to 3 second after one-year deployment and changes roughly linearly. The linear time correction of each OBS is finished by distributing the above result equally to every day. In addition, the influence of the nonlinear drifting of the clock, the error source and the selection of the referential station on the clock accuracy are discussed, which would be beneficial to the OBS data processing.

关 键 词：时间校正 海底地震仪 背景噪声互相关 雅浦俯冲带 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]