断层向错引起的地表重力变化研究

A Gravity Changes Theory of Fault Disclinations

利用三维角点法以及空间物体旋转的几何变换理论,建立断层向错与地表重力变化的关系,并进行数值模拟计算。选取断层下盘左端点为旋转基点,分析断层埋深和倾角对其向错引起的重力变化的影响。结果表明,断层向错引起的重力变化与断层埋深有明显的相关性,在W1、W2、W3向错模式下,重力变化均表现为随断层深度增加而逐渐衰减;重力变化对断层倾角有着不同的响应。断层运动产生的重力变化空间分布特征与断层的向错模式以及旋转基点的选择有关。

Using a three-dimensional corner point method and space objects rotating geometric transformations,the relationship between the fault disclination and gravity changes in the earth's surface is established.The influence of gravity changes on fault depth and dip is discussed by rotating basis points on the left endpoint.The results show that gravity changes are significantly correlated with depth of fault.Gravity changes gradually reduce with the increasing depth of fault in single disclination,or W1,W2 and W3 modes respectively.Fault dips in different modes have different responses.Surface gravity distribution is related to the disclination mode and rotating basis point.