Research on the movement of vibration source of train by means of SSA
用震源扫描算法（SSA）研究列车源的运动

In this paper,we study the train-induced vibration recorded by seismographs during our experiment in May 2004 in Yanzhou,Shandong Province hy means of Source-Scanning Algorithm(SSA).The result shows that there are 3 clear nest-shaped fine structures made by the movement of train in three very short time periods.We get three vibration source images by piecewise separation.The images show that the train is heading forward from NW to SE when passing through this district.The example convinces us that the source of train can be dealt with as a lot of separate little vibration sources by means of some suitable pretreatment.It also shows the potentials of SSA in dealing with the data lacking seismic phases like this.