| 南海东北部海陆深地震联测与滨海断裂带两侧地壳结构分析 |
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| 引用本文： | 赵明辉,丘学林,叶春明,夏戡原,黄慈流,谢剑波,王平.南海东北部海陆深地震联测与滨海断裂带两侧地壳结构分析[J].地球物理学报,2004,47(5):845-852. |
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| 作者姓名： | 赵明辉 丘学林 叶春明 夏戡原 黄慈流 谢剑波 王平 |
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| 作者单位： | 中国科学院海洋研究所,青岛,266071;中国科学院南海海洋研究所与广州地球化学研究所边缘海地质重点实验室,广州,510301;中国科学院南海海洋研究所与广州地球化学研究所边缘海地质重点实验室,广州,510301;广东省地震局,广州,510070 |
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| 基金项目： | 国家基础研究973项目(G20000467-01)，中国科学院南海海洋研究所领域前沿项目(LYQY200302)，国家自然科学基金资助项目(4000161958)，广东省科技计划项目(2002C32604)，广东省自然科学基金(021557)，中国科学院南海海洋研究所与广州地球化学研究所边缘海地质重点实 |
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| 摘 要： | 南海东北部首次成功实施海陆联合深地震探测，填补了海陆过渡带深地震探测的空白. 利用该次海陆联测地震数据，通过数据处理、震相分析、射线追踪、走时模拟等方法，获得了滨海断裂带附近的纵波地壳速度结构，探明了海陆联测剖面中滨海断裂带可能位置. 地壳速度结构为陆壳结构，地壳厚度由陆地向海区逐步变薄；在上地壳下部普遍存在一层速度为5.5～5.9km·s-1、厚度为2.5～4.0km的低速层，并向海区方向减薄，该区未发现明显的高速层. 滨海断裂带为一纵向低速带，位于南澳台东南35km处，对应于重、磁异常带，断裂带断至莫霍面，是华南陆区正常型陆壳与海区减薄型陆壳的分界地壳断裂.
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| 关 键 词： | 南海东北部 海陆深地震探测 滨海断裂带 地壳结构 低速层 |
| 文章编号： | 0001-5733(2004)05-0845-08 |
| 收稿时间： | 2003-8-26 |
| 修稿时间： | 2004-3-31 |
ANALYSIS ON DEEP CRUSTAL STRUCTURE ALONG THE ONSHORE-OFFSHORE SEISMIC PROFILE ACROSS THE BINHAI (LITTORAL) FAULT ZONE IN NORTHEASTERN SOUTH CHINA SEA |
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| ZHAO Ming-Hui , QIU Xue-Lin YE Chun-Ming XIA Kan-Yuan HUANG Ci-Liu XIE Jian-Bo WANG Ping Institute of Oceanology,Chinese Academy of Sciences,Qingdao ,China Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology & Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou ,China Earthquake Administration of Guangdong Province,Guangzhou ,China.ANALYSIS ON DEEP CRUSTAL STRUCTURE ALONG THE ONSHORE-OFFSHORE SEISMIC PROFILE ACROSS THE BINHAI (LITTORAL) FAULT ZONE IN NORTHEASTERN SOUTH CHINA SEA[J].Chinese Journal of Geophysics,2004,47(5):845-852. |
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| Authors: | ZHAO Ming-Hui QIU Xue-Lin YE Chun-Ming XIA Kan-Yuan HUANG Ci-Liu XIE Jian-Bo WANG Ping Institute of Oceanology Chinese Academy of Sciences Qingdao China Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology & Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Earthquake Administration of Guangdong Province Guangzhou China |
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| Institution: | 1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 2 Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology & Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510301, China 3 Earthquake Administration of Guangdong Province, Guangzhou 510070, China |
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| Abstract: | The onshore offshore deep seismic experiment was carried out for the first time and filled the blankness of the seismic surveys in the transition area between South China and northeastern South China Sea. The seismic data were analyzed and processed. The different seismic phases were identified and their travel time arrivals were modeled by ray tracing to study the P wave velocity crustal structure of this area. The crustal structure of this area is the continental crust. The crust thickness is gradually decreasing southward along the on shore offshore seismic line. The low velocity layer（5.5～5.9 km·s -1）exists generally in the middle crust （about 10.0～18.0km）with about 2.5～4.0 km thickness, which is also thinning seaward. No obvious high velocity layer appears in the lower crust. The Binhai (littoral) fault zone is a low vel ocity zone, which is located about 35km southeast to the Nan’ao station and cor responding to the gradient belt of gravity & magnetism anomalies. The depth of t he fault zone is close to the Moho discontinuity. The littoral fault zone is a b oundary between the normal continental crust of South China and the thinned cont inental crust of the sea area. |
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| Keywords: | Northeastern South China Sea Onshore-offshore deep seismic experiment Binhai(littoral)fault zone Crustal structure Low-velocity layer |
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