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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 .
For the first time in the northeastern part of the South China Sea, the deep sea and land-sea seismic exploration was successfully completed, filling in the blank of the deep seismic exploration in the transitional zone between the land and sea. By means of data processing, seismic facies analysis, ray tracing and traveltime simulation, The crustal velocity structure near the Binhai fault zone has proved the possible location of the coastal fault zone in the sea-continent joint profile. The crustal velocity structure is continental crustal structure, and the crustal thickness gradually decreases from land area to sea area. There is a layer The velocity is from 5.5 to 5.9 km · s-1, and the thickness is from 2.5 to 4.0 km. It is thinned toward the sea area, and no obvious high-velocity layer is found in this area. The coastal fault zone is a vertical low speed Belonging to the southeastern Taiwan 35km, corresponding to the heavy and magnetic anomalous zones, the fault zone is broken to the Moho. It is the boundary crustal fault between the normal continental crust and the thinned continental crust in the South China Sea.