数字台网观测资料中sPn震相的测定与应用

对于发生在地壳内的地震 ,sPn具有与Pn震相到时差与震中距无关以及振幅和周期都比Pn大的运动学和动力学特征 ,利用数字台网观测技术的优势 ,将震中距不同的台的Pn震相对齐后可同时测定多台的sPn震相 ,进而测定该地震的震源深度。这种分析和测定方法简捷准确 ,可在台网的日常近震分析中推广应用。

Determination and application of the phase sPn in the observation of digital seismic network

When the earthquake occurred in the earth' crust,the phase sPn has the character in kinematics and kinetics that the arrival time difference between the phase Pn and sPn is independent of the epicentral distance ,and it's amplitude and period are more than the phase Pn,so that we can use the technological ascendent of the digital seismic network ,by moving the phase Pn of different station to a line,then we can determine the phase sPn of multi-stations at the same time,and then we can calculate the focal depth. This way of analysis and determination is simple and nicety,so it can extend to the regional earthquake analyzing in the seismic network daily work.