摘要
本文根据地质和区域重力资料,利用重力三维正、反演方法研究得到了晋东北地区地壳深部构造。通过三维正演,得到了不同深度的剩余重力异常;用一个已知的莫霍界面的深度值,反演出了全区地壳厚度的平面分布。在此基础上,对一些活动断裂和构造的深度以及地震和第四纪火山活动的地壳深部构造背景进行了探讨。研究还发现,沿北纬40°线可能存在一条深部剪切构造带。
This paper mainly describes the preliminary results of deep crustal structure in north-eastern Shanxi Province and its vicinity from 3-D gravitational forward and backward calculation with the help of geological and regional gravity data. By 3-D normal calculation, the residual gravity at various depths is obtained, then, the plane distribution of crustal 'thickness in the whole region is inversed using the given depth of Moho. Based on the results above, the 'top-deep' varia-tion of some active faults and structures is simply discussed. In addition, the deep crustal tectonic background of the earthquakes and the Quaternary volcanic activities is studied. It is also found that there maybe exists a shear tectonic belt at depth along 40°N.
出处
《西北地震学报》
CSCD
1990年第3期64-71,共8页
Northwestern Seismological Journal
