多条人工地震测深剖面资料联合反演首都圈三维地壳结构

THREE-DIMENSIONAL CRUSTAL STRUCTURE OF THE CAPITAL AREA OBTAINED BY A JOINT INVERSION OF DSS DATA FROM MULTIPLE PROFILES

为了对多条二维剖面资料进行统一分析和解释 ,本文考虑了各剖面交点处的约束条件 ,通过建立统一的偏导矩阵 ,将各剖面资料联立求解 .利用该方法对中国地震局地球物理勘探中心在首都圈内 6条人工地震宽角反射 /折射剖面资料进行了重新处理和解释 ,得到该地区的地壳三维速度结构和构造特征 .在此基础上 ,结合其他地球物理研究成果 ,确定了壳内存在的 4处低速层 (体 )

In order to carry out an unified analysis and interpretation of the 2 D data from multiple profiles, constraints at the intersecting points of the profiles are taken into account. A solution of simultaneous equations with integrated data from all the profiles is accomplished by constructing a unified matrix of partial derivatives. The method is used to reprocess and reinterpret data from 6 wide angle reflection/refraction DSS profiles conducted in the Capital Area by the Research Center of Exploration Geophysics, China Seismological Bureau. As a result, 3 D velocity structures and tectonic characteristics of the crust in this area are obtained On this basis, and in the light of results by other geophysical techniques, the spatial scope of 4 crustal low velocity layers (bodies) and fault strikes are determined.