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学科主题: Geochemistry & Geophysics
题名: Lateral resolution analysis of deep crustal sounding: A case study on the data from ocean bottom seismometers in the northern South China Sea
作者: Wang, YL ; Yan, P
通讯作者: wenhuiwen@163.com
关键词: Northern South China Sea ; Deep crustal structure ; Ocean bottom seismometer ; Seismic tomography ; Lateral resolution
刊名: CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
发表日期: 2009
卷: 52, 期:9, 页:2282-2290
收录类别: sci
部门归属: [Wang Yan-Lin; Yan Pin] Chinese Acad Sci, S China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Wang Yan-Lin] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
项目归属: 海洋地质
摘要: Deep seismic sounding surveys in the past two decades show obvious crustal structure changes both across and along the northern margin of the South China Sea. In the surveys, some very closely spaced survey lines displayed remarkable differences in crustal structure. To find the reasons for the differences and to analyze the reliability of crustal structure, ocean bottom seismometer (OBS) data from the west and east sides of the Dongsha Islands were reprocessed and inverted with tomography technique. The routine processing and inversion procedures include clock correction, position correction, finite-difference ray-tracing-based tomography, checkerboard test and comparison of the inverted crustal model with initial models. As a key step, we analyzed the lateral velocity resolution and smoothed out the short wavelength velocity variation which maybe most probably artifacts in the final velocity models. Resolution test results show that the lateral resolution declines rapidly with depth. Within the depth range 0 similar to 8 km, the lateral resolution is 10 km; as to the depth of 8 similar to 17 km, the lateral resolution is 10 similar to 40 km; for the lowest parts 17 similar to 33 km, the lateral resolution is 40 similar to 80 km. With such a resolution check to a previous experiment, a previously inferred 6 km-wide deep fault zone that extends downward to the Moho interface in the coastal South China area is proved to be impossible to be imaged clearly.
原文出处: 查看原文
WOS记录号: WOS:000270377100012
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4602
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Wang, YL; Yan, P.Lateral resolution analysis of deep crustal sounding: A case study on the data from ocean bottom seismometers in the northern South China Sea,CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2009,52(9):2282-2290
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