According to focal mechanism, the directions of main press stress of the two are NNW in the seismic area but the fault plane solutions are different.
震区的主压应力为北北西方向，两震的受力方向基本一致，但断层面解明显不同。
It is of great significance in engineering and teaching to determine the direction of the largest main stress under the status of plane stress.
平面应力状态下最大主应力方向的判定在工程及教学中具有重要意义，应用平面应力理论可以找到判定其方向的快捷方法，并引用实例得到印证。
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