SCSIO OpenIR  > 中科院边缘海地质重点实验室
Time record and accurate correction of Chinese OBS raw data
Zhang HaoYu2; Qiu XueLin2; Zhang JiaZheng; He EnYuan; You QingYu1
AbstractTime 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 and 40 ms, while this drift of L or S-type at 100 Hz is between 0 and 90 ms, which can affect OBS data 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.
KeywordOcean Bottom Seismometer (OBS) OBS time record Internal file time drift Sampling interval
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang HaoYu,Qiu XueLin,Zhang JiaZheng,et al. Time record and accurate correction of Chinese OBS raw data[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,62(1):172, 182.
APA Zhang HaoYu,Qiu XueLin,Zhang JiaZheng,He EnYuan,&You QingYu.(2019).Time record and accurate correction of Chinese OBS raw data.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,62(1),172.
MLA Zhang HaoYu,et al."Time record and accurate correction of Chinese OBS raw data".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 62.1(2019):172.
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