Abstract:Using numerical simulation based on the existing station layout of Shanxi Network, we quantitatively analyze the effects of crustal velocity model, network layout and seismic phase picking accuracy on seismic source location. The results show that the three factors have different effects on the accurate location of seismic source. In the crustal velocity model, the upper crust velocity has the greatest influence on the epicenter location, and the epicenter location is more sensitive to the change of Moho velocity. The deviation of epicentral position caused by a single change of crustal velocity model is usually less than 5 km, the focal depth is very sensitive to the change of crustal velocity model, especially the Moho depth, and the maximum deviation may exceed 20 km. Without considering other factors, the maximum deviation between the epicenter position and the focal depth measured within 4 s with P-wave picking accuracy is not more than 2 km and 5 km. When the crustal velocity model is suitable and the seismic phase picking accuracy is high, the station layout with the maximum void Angle of 0°-180° has a better constraint on the focal location, the epicenter deviation is basically less than 1 km, and the focal depth deviation is slightly larger, about 2 km.