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华北地区上部地壳结构的三维有限差分层析成像
引用本文:段永红,张先康,方盛明.华北地区上部地壳结构的三维有限差分层析成像[J].地球物理学报,2002,45(3):362-369.
作者姓名:段永红  张先康  方盛明
作者单位:中国地震局地球物理勘探中心,郑州450002
基金项目:国家自然科学基金 (4 97742 3 0 ),地震科学联合基金联合资助项目 (1 980 62 ),中国地震局地球物理勘探中心论著号 2 0 0 0 1 4
摘    要:采用正方形网格对华北地区速度模型进行参数化、网格维数为649×90×16,网格间距为1km. 通过对华北地区30条深地震测深剖面的Pg波三维有限差分速度层析成像反演,获得了该地区上部地壳的三维速度结构. 反演结果显示,低速的"棱形"华北盆地被高速的隆起所包围;而华北盆地又由两个大的断陷带中间夹一个隆起所组成.两个大的断陷带又被分割为多个小的断陷盆地.研究区内的断层多为铲式正断层,结晶基底深度变化较大. 所有这些表明华北地区具有复杂的地质构造和发生强震的深部背景.

关 键 词:华北地区  有限差分  三维速度结构  结晶基底.  
文章编号:0001-5733(2002)03-0362-08
收稿时间:2001-01-16

TEREE-DIMENSIONAL FINITE-DIFFERENCE TOMOGRAPHY OF VELOCITY STRUCTURE OF THE UPPER CRUSTAL IN NORTH CHINA
DUAN YONG,HONG,ZHANG XIAN,KANG,FANG SHENG,MING.TEREE-DIMENSIONAL FINITE-DIFFERENCE TOMOGRAPHY OF VELOCITY STRUCTURE OF THE UPPER CRUSTAL IN NORTH CHINA[J].Chinese Journal of Geophysics,2002,45(3):362-369.
Authors:DUAN YONG  HONG  ZHANG XIAN  KANG  FANG SHENG  MING
Institution:Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China
Abstract:We parameterized velocity model of North China using square nets. In the velocity model total 649×890×16 grid points are included with grid spacing of 1.0km. Three dimensional finite difference inversion method is used to obtain 3 D velocity structure of the upper crust in North China by means of Pg wave data from 30 deep seismic sounding (DSS) profiles in the studied area. The inversion results revealed that the low velocity rhomb shaped North China basin is surrounded by high velocity uplifts, and North China basin is comprised of two large fault zones with an uplift in between. The two large fault zones are divided into several small basins. There are many shovel like normal faults in the studied area, and the depth of crystalline basement varies significantly at different geological structures. All of these results suggest that North China has very complicated geological structure and it has the deep structural background for strong earthquakes.
Keywords:North China  Finite  difference  Velocity structure  Crystalline basement  
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