破裂面方向 Direction of fracture plane
Focal mechanism reflects regional stress state and focal depth shows rheology feature of medium, while rupture directivity can be used to determine the fault on which the earthquake occurs.
震源参数中的机制解反映区域应力状态,震源深度反映介质流变性质(脆性-韧性转换),而地震破裂方向可用来确定发震断层。
参考来源 - 中小地震震源参数研究·2,447,543篇论文数据，部分数据来源于NoteExpress
破裂方向效应是由破裂传播和辐射图效应引起的。
The rupture directivity effect is due to rupture propagation and radiation pattern effects.
分析认为，孕震应力场的应力强度对孕震区内地震的破裂方向有明显的约束作用。
This suggests that focal stress intensity has restraining effect on earthquake's rupture direction.
文章最后给出了美国西部考虑震源破裂方向的地震动峰值加速度和均方根加速度的衰减关系。
Finally, the formulas of PGA and RMS accelerations attenuation dependent on the rupture direction of the seismic source are presented for the Western United States.
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