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以断裂力学和断裂动力学原理为基础，采用复变函数方法，定量讨论了当断层两侧块体尺寸（宽度）不等时，断层体（即合断层的岩石块体）的稳定性．着重考虑断层两侧块体宽度（或高度）以及断裂传播速度对上述不稳定性的效应．这些分析结果对震源观测中发现的低应力降现象做了完好的解释，也对板块构造理论涉及该方面的内容做出补充．
Based on the principles of fracture mechanics and fracture mechanics, the complex variable function method is used to quantitatively discuss the stability of the fault body (ie, the fractured rock mass) when the block sizes (widths) on both sides of the fault are not equal. The effect of the above instabilities on the widths (or heights) of the blocks on both sides of the fault and the propagation velocity of the fracture is emphasized. The results of these analyzes provide a good explanation of the low stress drop found in source observations and complement the tectonic theory of plate tectonics.