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Distribution and identification of the low-velocity layer in the northern South China Sea
作者姓名:Zhao Minghui  Qiu Xuelin  Xu Huilong  Shi Xiaobin  Wu Shimin  Ye Chunming and Xia Shaohong
作者单位:Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China; Earthquake Administration of Guangdong Province,Guangzhou 510070,China
基金项目:中国科学院基金;广东省自然科学基金
摘    要:The low-velocity layer (LVL), closely related with tectonic activities and dynamic settings, has always been a hot topic in the deep crustal structure studies. The deep seismic (OBS/OBH) and onshore-offshore experiments have been extensively implemented in the northern South China Sea (SCS) since the 1990s. Six seismic profiles were finished on the northern margin of SCS by domestic and international cooperations. The features of crustal structures were revealed and five velocity-inversion layers were discovered. Among them three LVLs with 3.0—3. 5 km·s-1 velocity are located in the sedimentary structure (2.0—6.0 km in depth and 2.0—4. 6 km in thickness) of the Yinggehai Basin and Pearl River Mouth Basin. They were identified by the reflective and refractive phases for their shallow depth. The other two LVLs with 5.5—6.0 km·s-1 velocity generally existed in the middle crust (7.0—18.0 km in depth) with an about 2.5—6.0 km thickness in the transitional crustal structure of the northeastern and northwestern SCS. They were detected by the refractive phase from their overlain and underlying layers. We explored the possible tectonic formation mechanisms combining with previously reported results, which provided evidence for the formation and evolution of SCS.


Distribution and identification of the low-velocity layer in the northern South China Sea
Zhao Minghui,Qiu Xuelin,Xu Huilong,Shi Xiaobin,Wu Shimin,Ye Chunming and Xia Shaohong.Distribution and identification of the low-velocity layer in the northern South China Sea[J].Progress in Natural Science,2007,17(5):591-600.
Authors:Zhao Minghui  Qiu Xuelin  Xu Huilong  Shi Xiaobin  Wu Shimin  Ye Chunming  Xia Shaohong
Abstract:The low-velocity layer (LVL), closely related with tectonic activities and dynamic settings, has always been a hot topic in the deep crustal structure studies. The deep seismic (OBS/OBH) and onshore-offshore experiments have been extensively implemented in the northern South China Sea (SCS) since the 1990s. Six seismic profiles were finished on the northern margin of SCS by domestic and international cooperations. The features of crustal structures were revealed and five velocity-inversion layers were discovered. Among them ness) of the Yinggehai Basin and Pearl River Mouth Basin. They were identified by the reflective and refractive phases for their shallow 2.5-6.0 km thickness in the transitional crustal structure of the northeastern and northwestern SCS. They were detected by the refractive phase from their overlain and underlying layers. We explored the possible tectonic formation mechanisms combining with previously reported results, which provided evidence for the formation and evolution of SCS.
Keywords:low-velocity layer  deep crustal structure  the northern South China Sea  OBS/OBH and onshore-offshore seismic experiments
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