爆炸震源的地震纵波是脉冲性质的。周期振动是地震脉冲引起的次生振动。
A primary seismic wave from an explosive source is a pulse response, and its periodic vibration originates from seismic pulses.
P波有时被看作纵波，因为它们以更快的传递速度穿越地球内部，因此最先被地震监测站台发现。
P-waves are sometimes known as primary waves, because they travel faster through the Earth and so are the first to arrive at monitoring stations.
波有时被看作纵波，因为它们以更快的传递速度穿越地球内部，因此最先被地震监测站台发现。
P-waves are sometimes known as primary waves, because they travel faster through the Earth and so are the first to arrive at monitoring stations.
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