You can try to fit an earthquake location on the map just to see how the procedure goes. 你可以尝试在地图上匹配一个地震地点来理解这个程序运行的过程。
Waldhause F,Ellsworth W L.A double difference earthquake location algorithm:Method and application to the Northern Hayward Fault,California[J].Bull Seism Soc Amer,2000,90(6):1353. 杨智娴
Bai C.-Y., Greenhalgh S. and R.Zhao, 2008.Rapid 3-D earthquake location using a hybrid global-local inversion approach, revision submitted to Pure and Applied Geophysics. 白超英，赵瑞，李忠生.
It is indicated that the analysis of the three branches of PKP phase will be helpful to improve the accuracy of phase analysis and earthquake location of the entire China seismic network. 进而指出,分析PKP震相的3个分支,将有助于提高台站震相分析的精度,也将有助于整个中国地震台网的定位精度。
Waldhauser, F., and W.L.Ellsworth, 2000.A double-difference earthquake location algorithm: method and application to the northern Hayward fault, California.Bull.Seism.Soc.Am., 90, 1353-1368. 詹忠翰，2002.