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《Chinese Journal of Geophysics》 2019-01
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Time record and accurate correction of Chinese OBS raw data

ZHANG HaoYu;QIU XueLin;ZHANG JiaZheng;HE EnYuan;YOU QingYu;Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences;Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences;  
Time record of the Ocean Bottom Seismometer(OBS)is crucial for data processing.Larger internal time drift errors were discovered in some Chinese portable OBSs,which result in"stair"or"incline"events on observed seismic record sections.We designed zero-offset experiments to verify these abnormal phenomena,confirming that they are caused by internal time drift of data files as well as some bugs existing in data processing programs.According to the statistics,internal file time drift of A or B-type OBS at the preset sampling rate of 250 Hz is between 0 and40 ms,while this drift of L or S-type at 100 Hz is between 0 and 90 ms,which can affect OBSdata processing and structural simulation.We corrected this time error by means of actual sampling interval calculation,sampling interval adjustment and data re-sampling.Some modifications were also made to relevant OBS data processing programs.Our research promotes the awareness of time records of OBS data,acquires the regularity of internal file time drift variation,and highlights the accurate correction of the intermediate and larger extent of this time error.Our work improves the OBS data processing steps and flow chart,makes a significant supplement for effective utilization of OBS data,and provides an important reference for extensive use and development of domestic OBSs.
【Fund】: 中国科学院先导专项(XDB060302);; 国家重点研发计划(2018YFC0309800);; 国家自然科学基金项目(41674092 91428204 41676045 41730532)联合资助
【CateGory Index】: P716.83
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