汕头－吕宋岛岩石圈速度结构与震源构造──台湾浅滩7．3级地震构造之一
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摘要
汕头－吕宋岛岩石圈速度结构剖面，划分出华南陆缘古生代陆壳、陆架区晚古生代－中生代陆壳、陆坡带中生代－早第三纪过渡壳、新生代南海海盆洋壳及吕宋岛中生代－新生代岛弧陆壳与东吕宋海槽洋壳等地壳构造组分，并确定了上述地壳构造之间的边界断裂构造及其性质。结合地震震源分布及机制，初步确定了华南陆架盆岭构造带北、南两侧地震构造的控震构造与发震构造性质及其震源力学特征；１）指出１９９４年９月１６日台湾浅滩７．３级地震属于板缘壳幔地震及造成一千公里有感范围的原因；２）马尼拉海沟的海底地堑构造与南海海盆岩石圈地幔上隆是马尼拉海沟俯冲带震源显示正断层性质的原因，且为被动的或转换俯冲带；３）东吕宋海槽仍属于菲律宾海俯冲带性质；吕宋岛东西两侧俯冲带岩石圈板片震源深度的准三层分布，可能表明俯冲带岩石圈板片存在相应的低速滑移层。
Shantou-Luzon island has been devided into the Palaeozoicera crust of Huanan continental margin,the late Palaeozoic-Mesozoic crust of the shelf region, the Mesozoic era-the early Tertiary period transition crust of the continental slope zone, the Cenozoic sea basin oceanic crust of the Nanhai sea, the Mesozoic-Cenozoic island are crust of the Luzon island and the oceanic crust of the east Luzon trough and other crustal structure, and the boundary fault structure among the above mentioned crustal structure and feature has been defined by the velocity structure sections of the lithosphere from Shantou to Luzon. The mechanics feature of focus and controling and generating earthquake structure are established preliminery combined with focus distribution and focus mechanism on the both sides of the south and north Huanan shelf basin mountain range structure zone; It is suggested that Taiwan shoal Ms7.3 earthquake on September 16, 1994 is a crust-mantle earthquake of the plate margin, and then it is sensed over 1000km. The reason for displaying normal fault fearure of Manila trench subduction zone to be considered is a submarine graben structure of Malila trench and mantle rise of sea basin lithosphere of Nanhai sea. which is passive or transform subduction zone; The east Luzon trough belongs to subduction zone of Philippine Sea; The quasi-three layers distribution of lithosphere slab focal depth on both sides of the east and the west of Luzon island subduction zone may show the relevant low velocity phorogenesis layer existed in the lithosphere slab of the subduction zone.
Shantou-Luzon island has been devided into the Palaeozoicera crust of Huanan continental margin,the late Palaeozoic-Mesozoic crust of the shelf region, the Mesozoic era-the early Tertiary period transition crust of the continental slope zone, the Cenozoic sea basin oceanic crust of the Nanhai sea, the Mesozoic-Cenozoic island are crust of the Luzon island and the oceanic crust of the east Luzon trough and other crustal structure, and the boundary fault structure among the above mentioned crustal structure and feature has been defined by the velocity structure sections of the lithosphere from Shantou to Luzon. The mechanics feature of focus and controling and generating earthquake structure are established preliminery combined with focus distribution and focus mechanism on the both sides of the south and north Huanan shelf basin mountain range structure zone; It is suggested that Taiwan shoal Ms7.3 earthquake on September 16, 1994 is a crust-mantle earthquake of the plate margin, and then it is sensed over 1000km. The reason for displaying normal fault fearure of Manila trench subduction zone to be considered is a submarine graben structure of Malila trench and mantle rise of sea basin lithosphere of Nanhai sea. which is passive or transform subduction zone; The east Luzon trough belongs to subduction zone of Philippine Sea; The quasi-three layers distribution of lithosphere slab focal depth on both sides of the east and the west of Luzon island subduction zone may show the relevant low velocity phorogenesis layer existed in the lithosphere slab of the subduction zone.
引文
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