张浩宇^1,3,,
丘学林^1,3,,,
张佳政¹,
贺恩远¹,
游庆瑜²
1. 中国科学院边缘海与大洋地质重点实验室, 中国科学院南海海洋研究所, 广州 510301
2. 中国科学院油气资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029
3. 中国科学院大学, 地球与行星科学学院, 北京 100049

基金项目: 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


详细信息

作者简介: 张浩宇, 男, 1995年生, 硕博连读生, 研究方向为海洋深部地球物理.E-mail:haoyuzhang@scsio.ac.cn

通讯作者: 丘学林, 男, 1964年生, 研究员, 博导.E-mail:xlqiu@scsio.ac.cn

中图分类号: P738

收稿日期:2017-11-20
修回日期:2018-12-13
上线日期:2019-01-05

Time record and accurate correction of Chinese OBS raw data

ZHANG HaoYu^1,3,,
QIU XueLin^1,3,,,
ZHANG JiaZheng¹,
HE EnYuan¹,
YOU QingYu²
1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China


More Information

Corresponding author: QIU XueLin,E-mail:xlqiu@scsio.ac.cn

MSC: P738

--> Received Date: 20 November 2017
Revised Date: 13 December 2018
Available Online: 05 January 2019


摘要
摘要:海底地震仪（OBS）的时间记录对数据处理是至关重要的.实践发现，部分国产便携式OBS的数据记录存在较大的内部时间误差，并且实测地震剖面异常的同相轴"断阶"、"倾斜"现象时有发生.我们通过自激自收试验，对这些异常现象进行了验证，确认其来源于OBS数据文件内部时间漂移，以及数据处理程序存在的缺陷.统计表明，A、B型OBS内部时间漂移量在250 Hz的预设采样率下为0~40 ms，L、S型OBS在100 Hz下为0~90 ms.这个量级的时间漂移，会对OBS数据处理、计算模拟产生影响.进一步，我们采用计算实际采样间隔、调整采样间隔、数据重采样的方法，对这种误差进行校正，并且改进了相关的OBS数据处理程序.本文的研究加深了对OBS数据时间记录误差的认识，得到了OBS数据文件内部时间漂移的分布规律，使得中等及较大程度的内部时间漂移的精细校正得到重视，进而完善了OBS数据处理步骤和流程，对OBS数据的有效利用进行了重要补充，为国产OBS的广泛使用、仪器研发提供了重要参考.
关键词: 海底地震仪(OBS)/
OBS时间记录/
内部时间漂移/
采样间隔

Abstract: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 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.
Key words:Ocean Bottom Seismometer (OBS)/
OBS time record/
Internal file time drift/
Sampling interval



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