n. onset
misc. first motion
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提出了提取快、慢剪切波初动的线性变换方法。
A linear transformation method to extract the onset of fast and slow shear waves is proposed in this paper.
全波模型震相分析法可用来研究震相的初动方向。
The full wave model phase analysis can be used to study the first motion direction of waves.
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。
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.
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