When stress wave is used to inverse joints attitude, the key problem is judge the initial arriving moment of reflected P-wave from the tested vibration signal.
节理产状应力波反演时，关键问题在根据测试振动信号判断出节理面反射纵波初至时刻。
The average focal mechanism of the swarm area has been inversed from the spatial distribution of the polarities of 2177 P-wave initial motions in the Jaishi swarm.
根据伽师震群地震的2 1 77个P波初动方向记录，计算了伽师震群的平均震源机制解。
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