Abstract:Ambient noise tomography is a powerful method to image the structure of the crust and upper mantle with better resolution. We use the nearest neighbor algorithm to map S wave velocity based on the ambient noise phase speed tomography of the Qingling-Dabie orogenic belt. With depths of 6~38 km S wave velocity, we build the partition velocity model, and apply it to the seismic localization of the June 16,2017 Zigui M4.3 and the February 23,2017 Zigui M3.8 earthquakes. The results show that the average error of the partition model issmaller, and the seismic localization results of the partition model is closer to the results from the Three Gorges digital seismological network. So, the partition velocity model is more reasonable than the one-dimensional velocity model in seismic localization.