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上海地区地壳精细结构的综合地球物理探测研究
引用本文:姚保华,章振铨,王家林,火恩杰,张先康,刘保金,吴健生,王夫运,于鹏,毛雅萍.上海地区地壳精细结构的综合地球物理探测研究[J].地球物理学报,2007,50(2):482-491.
作者姓名:姚保华  章振铨  王家林  火恩杰  张先康  刘保金  吴健生  王夫运  于鹏  毛雅萍
作者单位:1.上海市地震局,上海 200062 2 同济大学海洋地质教育部重点实验室, 上海 200092 3 中国地震局地球物理勘探中心, 郑州 450002
基金项目:国家发展与改革委员会项目(2004-1138),上海市“十五”重点项目(023137101001),上海市科委重点课题(042512030)资助
摘    要:通过在上海地区开展深、浅地震反射、地震宽角反射/折射、高分辨地震折射和大地电磁测深等联合剖面探测, 获得了该地区近地表至Moho面的精细速度结构、电性结构和深浅构造关系.结果表明, 该地区地壳可划分为上、中、下三个组成部分.其中,上地壳厚为12~14 km,波速为57~59 km/s;中地壳厚度约为10 km,波速为59~62 km/s;下地壳厚为10~11 km, 波速为62~63 km/s,Moho面深度约为32 km.剖面浅部地质构造复杂,共解释出12条特征明显的断裂.其中,除3条断裂错断结晶基底(G界面)并向下延伸至上地壳底界面外,其他断裂均在深度3~5 km以上终止或收敛于G界面之上.此外,仅在剖面西侧基底下部约13~15 km埋深处发现一厚度在2 km左右的壳内高导层.所以,在综合各方面资料后分析认为,在剖面经过地区不存在发生大地震的深部构造条件,近地表所存在的活动断层是未来产生对该区有影响地震的震源区.

关 键 词:深地震反射  高分辨折射  宽角反射/折射  大地电磁测深  地壳细结构  
文章编号:0001-5733(2007)02-0482-10
收稿时间:2006-3-13
修稿时间:2006-03-13

Prospecting and research on fine crustal structure by using multi-geophysics survey methods in Shanghai region
YAO Bao-Hua,ZHANG Zheng-Quan,Wang Jia-Lin,HUO En-Jie,ZHANG Xian-Kang,LIU Bao-Jin,WU Jian-Sheng,WANG Fu-Yun,YU Peng,MAO Ya-Ping.Prospecting and research on fine crustal structure by using multi-geophysics survey methods in Shanghai region[J].Chinese Journal of Geophysics,2007,50(2):482-491.
Authors:YAO Bao-Hua  ZHANG Zheng-Quan  Wang Jia-Lin  HUO En-Jie  ZHANG Xian-Kang  LIU Bao-Jin  WU Jian-Sheng  WANG Fu-Yun  YU Peng  MAO Ya-Ping
Institution:1.Earthquake Administration of Shanghai Municipality, Shanghai 200062, China 2 Laboratory of Marine Geology, MOE, Tongji University, Shanghai 200092, China 3 Research Center of Geophysical Exploration, CEA, Zhengzhou 450002, China
Abstract:The fine seismic velocity structure, electrical conductivity structure and geometrical construction of the crust in Shanghai region and the coupled relationship between the deep and shallow structures are investigated by using multi_geophysics exploration methods, such as shallow seismic reflection, deep seismic reflection, high_resolution seismic refraction, deep seismic wide angle reflection/refraction and magnetotelluric sounding. The research results indicate that the crust in the region can be divided into three layers, namely upper, middle, and lower crust. The upper crust is 12~14km thick with a seismic velocity of 57~59km/s, the middle crust is about 10 km thick with a velocity of 59~62 km/s, and the lower crust is 10~11 km thick with a velocity of 62~63 km/s. The depth of Moho in the region is 31~33 km. There are 12 main faults explained in the experimental profile. Except for three faults, which have dislocated G interface (crystalline basement) and extended down to the bottom interface (whose depth is about 10 km) of the upper crust, the other faults have ended above G interface at 3 to 5 km depth, or have converged at G interface. Moreover, there is only a high conductivity layer (about 2 km thick)within crust at 13~15 km depth. Therefore, there is no deep structure condition for potential big earthquakes in the local region. However, the active rupture zones near the earth's surface are potential seismic source zone. The experimental profiling is the first high resolution comprehensive deep survey profile in Shanghai and its conjoined regions.
Keywords:Deep seismic reflection  High-resolution seismic refraction  Deep seismic wide angle reflection/refraction  Magnetotelluric  Fine crustal structure
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