珠江口盆地及其邻近地区的活动断裂与地震活动
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摘要
珠江口盆地位于南海北部，属于大陆地壳的陆缘张裂型盆地，其形成与地幔向上隆起和地壳拉张减薄有密切关系。自中新世纪晚期以来，珠江口盆地的坳陷为沉积区，盆地的隆起及外围为剥蚀区。盆地北缘的北东东向正断层被北北西向断裂左旋错动。盆地南缘及东沙隆起被一系列北西西－近东西向左旋走滑断裂切割。它们是本区主要的地震断裂。盆地的坳陷为地震活动较弱的地区，其北、南两侧的隆起带是近代地震频繁地区。本区地震分布继承了晚中新世以来珠江口盆地断块差异升降运动的发展。
The Pearl River mouth basin is located in the north part of the South China Sea. It is a basin type of the rifted continental margins in the crust. There are close conections between the genesis of basin and the uplift of the mantle with thinning and tension of the crust.Since the late epoch of the Miocene the fosedeep part of the basin is belonged to the deposit area. In the mean time the uplift part and the vicinity areas of the basin is the erosion zone.The normal fault zone with NEE trending are cut by some NNW faults with left-lateral dislocation in the north of the basin. There is a series of strike-slip faults with NWWEW trending in the south margin of the basin as well as in the Dongsha uplift. They are the main seismic faults in these areas.The seismic activity is very weak in thd diposit area of the basin. There are seismic activities in the uplift zones in the north and south margins of the basin, where are the active zones in the neotectonic movement.
The Pearl River mouth basin is located in the north part of the South China Sea. It is a basin type of the rifted continental margins in the crust. There are close conections between the genesis of basin and the uplift of the mantle with thinning and tension of the crust.Since the late epoch of the Miocene the fosedeep part of the basin is belonged to the deposit area. In the mean time the uplift part and the vicinity areas of the basin is the erosion zone.The normal fault zone with NEE trending are cut by some NNW faults with left-lateral dislocation in the north of the basin. There is a series of strike-slip faults with NWWEW trending in the south margin of the basin as well as in the Dongsha uplift. They are the main seismic faults in these areas.The seismic activity is very weak in thd diposit area of the basin. There are seismic activities in the uplift zones in the north and south margins of the basin, where are the active zones in the neotectonic movement.
引文
艾南山等．1982，东南沿海水系及新构造应力场．地理学报，Vol．27，No．2。陈仁法等，1983，对广东地区构造体系活动特征及现今构造应力场的研究，华南地震，Vol．3，No．1。陈挺光，1988，广东大亚湾核电站地壳稳定性评价简介，广东地质，Vol．3，No．2。陈宗基，1983，中国板块动力学，地球物理文集（中国地球物理学会第三届理事会第二次会议），中国地球物理学会编辑出版。丁原章等，1988，琼东北地区构造应力场的反演，海南岛北部地震研究文集，地震出版社。丁原章等，1988，琼北地震的构造条件与发震机制，海南岛北部地震研究文集，地震出版社。丁原章等，1989，广东省地震地质问题，广东地质，Vol．4，No．1。丁原章等，1992，华南沿海断裂构造的地震危险性，中国东南沿海第四纪论文集，地震出版社。丁原章等，1992，巴士系构造的地震危险性，华南地震，Vol．12，No．2。何春荪，1982，台湾的构造发展（台湾构造图说明书），台湾经济部。梁慧娴等，1992，珠江口盆地新生代岩浆活动．广东石油，No．16。林纪曾等，1980，东南沿海地区的震源机制与构造应力场，地震学报，No．30。李平鲁，1992，珠江口盆地新生代构造运动讨论，广东石油，No．6。刘以宣，1981，华南沿海区域断裂构造分析，地震出版社。刘以宣等，1993，南海及邻域现代构造应力场与近代地壳运动及地壳稳定性研究，华南地震，Vol．13，No．1。汪素云等，1988，中国东部大陆的地震构造应力场，地震学报，No．1。薛万俊等，1991，南海中北部第四纪古气候及古海洋学，南海地质研究，Vol．4，广东科技出版社。姚伯初，1991，南海盆地在新生代的构造演化，南海地质研究，Vol．13，广东科技出版社。姚伯初，1992，南海北部陆缘在新生代的构造运动，广东石油，No．16。邹家泉等．1979，中国及邻区现代构造应力场的区域特征，地震学报，No．1。游象照，1982，广西活动性断裂的特征及其地震关系，华南地震，No．3。赵毅等，1988，琼北及其邻区震源应力场研究，海南岛北部地震研究文集，地震出版社。张虎男等，1990，华南沿海新构造运动与地质环境，地震出版社。曾维军，1991，广州－巴拉望地学断面综合研究，南海地质研究，Vol．3，广东科技出版社。BrianBayly，1991，Mechaniceinstructuralgeologyspringer－verlag．PhilipAAllenandJohnRAllen，1990，Basinanalysis（Principlesandapplications）blackwellscientific，Publications，Tapponnire，P，etal．1982，Propagatingextrusiontectonicsinasianewinsightsfromsimleexperimentswithplasticine，Geologg，Vol．10，611－616．
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