The vertical deformation gradient can reflect the rate of vertical change in unit distance,and the vertical deformation velocity gradient can reflect the strength of the earth's crust tectonic activities.In this paper,using long period leveling data combined with GPS data,the vertical deformation gradient values are calculated.Leveling data and GPS data are two different means of monitoring deformation,but the result is approximately the same vertical deformation gradient.The results show that the spatial distribution of the vertical deformation velocity gradient and tectonic distribution has an obvious correlation.The most significant gradient anomalies along the North-South Seismic Belt are Xianshuihe fault,Longmenshan fault and Xiaojiang-Zemuhe fault,while the second gradient anomalies in the northeastern Qinghai-Tibetan plateau are Zhuanglanghe fault and Lengiongling fault.The Menyuan Ms6.4 earthquake in 2016 occurred in this abnormal area.However,according to the vertical deformation high gradient area distribution,there is also the possibility of an earthquake occurrence in the Tianzhu and Jingtai area.The area of convergence of three major fault zones is the strongest tectonically active region of the North-South Seismic Belt.
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