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The correction of shot and OBS position in the 3D seismic experiment of the SW Indian Ocean Ridge
Ao, W; Zhao, MH; Qiu, XL; Li, JB; Chen, YS; Ruan, AG; Li, SJ; Zhang, JZ; Wu, ZL; Niu, XW; aowei100@163.com; mhzhao@scsio.ac.cn
2010
发表期刊CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
卷号53期号:12页码:2982-2991
摘要In a three-dimensional (3-D) seismic experiment carried out at sea, due to the distance between GPS antenna on ship and the center of air gun sources in sea water, and some environmental factors such as wind and sea current, the survey ship would adjust its heading direction which causes the shot's real position to deviate from presupposed shot track; meanwhile, real locations of OBSs on the seafloor would drift from designed points (deployed locations) since OBSs are of free-fall type and are usually affected by sea current during descending. So, the calibration of air gun shot and Ocean Bottom Seismometer (OBS) locations are basic steps for later studies on fine seismic velocity tomography. Our research focuses on the correction of shot and OBS positions with latest data from a new 3D seismic experiment in the SW Indian Ocean Ridge. The shot positions were corrected with geometric relationship among ship's heading, GPS antenna and the air gun array. The correction of OBS positions was based on travel times of direct water waves, and Monte Carlo and Least Square Methods were adopted. In addition, we discuss the relationship between reduced travel time curve of direct water wave and OBS deviation. Our results show that OBS locations generally drifted from the design points about 1 km, with an error range of 0 similar to 20 m and shots were adjusted to their actual positions. The research results do not only supply a fundamental database for the 3D seismic tomography in SW Indian Ocean Ridge, but also provide valuable experiences for 3D seismic survey in the South China Sea in future.
部门归属[Ao Wei; Zhao Ming-Hui; Qiu Xue-Lin; Zhang Jia-Zheng] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Li Jia-Biao; Ruan Ai-Guo; Li Shou-Jun; Wu Zhen-Li; Niu Xiong-Wei] State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China; [Chen Yang-Shun] Peking Univ, Sch Earth & Space Sci, Dept Geophys, Computat Geodynam Lab, Beijing 100871, Peoples R China; [Ao Wei; Zhang Jia-Zheng] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
关键词Ocean Bottom Seismometer Obs Relocation 3d Seismic Experiment Sw Indian Ocean Ridge
学科领域Geochemistry & Geophysics
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000285862200022
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4296
专题中科院边缘海地质重点实验室
通讯作者aowei100@163.com; mhzhao@scsio.ac.cn
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Ao, W,Zhao, MH,Qiu, XL,et al. The correction of shot and OBS position in the 3D seismic experiment of the SW Indian Ocean Ridge[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2010,53(12):2982-2991.
APA Ao, W.,Zhao, MH.,Qiu, XL.,Li, JB.,Chen, YS.,...&mhzhao@scsio.ac.cn.(2010).The correction of shot and OBS position in the 3D seismic experiment of the SW Indian Ocean Ridge.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,53(12),2982-2991.
MLA Ao, W,et al."The correction of shot and OBS position in the 3D seismic experiment of the SW Indian Ocean Ridge".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 53.12(2010):2982-2991.
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