Epicenter distance-weighing is calculated through the use of axis-symmetry image, and a location method of weighting-azimuth is established. This method takes into full account different contributions of various epicenter distances to seismic locations. Precision calculated by the weighted method is distinctly improved compared with other methods. This method does not have a limit on station numbers, and the requirement for the layout of the seismologic observation network is low. In the case of the unreasonable layout of seismic network when Geiger method and virtual wave method of velocity fail to provide reliable data, weighting-azimuth method can give better location results.[著者文摘]