Abstract:We have inverted for the Rayleigh wave group velocity distribution of Henan and its adjacent areas with periods of 8~25s using ambient noise tomography. Vertical component continuous waveform data used in this study are from January 2014 to December 2015 recorded by 39 broadband seismic stations of Henan and its adjacent areas. Empirical Green's functions were extracted from waveform cross-correlation and stack of each pair of stations. Then,by using the frequency time analysis method,we got 498 group velocity dispersion curves of Rayleigh wave. The imaging results show that the group velocity distribution at period 8s shows clear correlations with the surface geological structures. The plain area is characterized by low velocity anomaly,and the mountain area is characterized by high velocity anomaly. The high velocity anomalies in the mountain area with periods of 14s and 20s are similar to those of 8s,indicating the correlation between the upper crust and the shallow crust structure. During the 8~20s periods,the range of low velocity anomalies in the North China Plain decreased with the increase of the period. Low velocity anomalies in the lower crust of the North China Plain may be related to continental crustal thinning. The velocity is high in the east and low in the west in the lower crust bounded by Taihang-Wuling gravity gradient zone. The velocity difference reflects the structural characteristics of the crust,which is thin in the east and thick in the west.