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Abnormal data retrieval of three-dimensional OBS survey at the Bashi Channel area of the South China Sea
Zhang, JZ; Qiu, XL; Zhao, MH; You, QY; He, EY; Wang, Q; jzzhang@scsio.ac.cn; xlqiu@scsio.ac.cn
2018
发表期刊CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
卷号61期号:4页码:1529-1538
摘要A three-dimensional seismic survey was carried out in the Bashi Channel area of the South China Sea from April to July 2016 by R/V "Shiyan2" in order to explore the crustal structure of the northern Manila trench subduction zone. Forty-eight Chinese portable OBSs were deployed and finally 41 OBSs were recovered. A total 10,800 shots were fired with shooting lines up to 2300 km long. Abundant seismic data were collected, but those recorded by 25 new types of Chinese OBSs were abnormal. No seismic phases can be identified from these 25 seismic record sections, leading to a serious problem in subsequent structural simulation. After checking data format, verifying shooting time, comparing shooting signals with adjacent normal OBSs, and analyzing the external and internal OBS data file time, we finally found that the sample intervals of abnormal OBSs have been changed from 4. 0 ms to 4. 5 ms. The OBS internal time was calculated wrong due to the sample interval change, and no seismic phases were identified during data format conversion. Decreasing CPU frequency of the new type OBS in order to save energy is the main reason to change the sample interval. By use of adjusting sample interval and resampling, the abnormal seismic data of 25 OBSs were retrieved eventually and clear seismic phases can be identified in these 25 seismic record sections. This research not only retrieved the valuable OBS data which are the basis for further structural simulation, making the maritime mission of NSFC major project more complete, but also promoted the scientific significance of this cruise and provided an important reference for the development and usage of Chinese OBSs in the future.
部门归属[Zhang JiaZheng; Qiu XueLin; Zhao MingHui; He EnYuan; Wang Qiang] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [You QingYu] Chinese Acad Sci, Inst Gol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China; [Qiu XueLin; Wang Qiang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
学科领域Geochemistry & Geophysics
关键词[WOS]Abnormal data retrieval ; Ocean Bottom Seismometer (OBS) ; Three-dimensional survey ; Bashi Channel ; South China Sea
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17142
专题中科院边缘海地质重点实验室
通讯作者jzzhang@scsio.ac.cn; xlqiu@scsio.ac.cn
推荐引用方式
GB/T 7714
Zhang, JZ,Qiu, XL,Zhao, MH,et al. Abnormal data retrieval of three-dimensional OBS survey at the Bashi Channel area of the South China Sea[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(4):1529-1538.
APA Zhang, JZ.,Qiu, XL.,Zhao, MH.,You, QY.,He, EY.,...&xlqiu@scsio.ac.cn.(2018).Abnormal data retrieval of three-dimensional OBS survey at the Bashi Channel area of the South China Sea.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(4),1529-1538.
MLA Zhang, JZ,et al."Abnormal data retrieval of three-dimensional OBS survey at the Bashi Channel area of the South China Sea".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.4(2018):1529-1538.
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