A large number of real seismic data show that the earthquake triggered landslides are the main cause of road engineering damage.The permanent displacement prediction formula based on Newmark block model for Jibson slope is currently the only method to evaluate the risk of earthquake triggered landslide from the perspectives of deformation damage and overall failure probability of slope.Verified by seismic data of the"5·12"Wenchuan earthquake

the calculated value of Jibson method was smaller than the field measured displacement.Theoretical analysis showed that this slide model does not consider the shear strength attenuation effect of the sliding surface during the earthquake

leading to a small predicted displacement.In view of this

the Newmark slide model was modified by adding attenuation coefficients to the effective internal friction angle and effective cohesion of the rock mass on the sliding surface.Based on the modification and the method framework of Jibson slope failure probability model

the risk zoning criterion with the surface density as the main indicator was established for earthquake triggered landslide assessment using real earthquake data of Wenchuan earthquake.The modified method was verified by the real earthquake data of the"4·20"Lushan earthquake.The presented method can not only predict the severity of coseismic collapse and landslide

but also contain the development information about the hazard-inducing environment after the earthquake.It can provide a scientific basis for road route selection in high intensity earthquake mountain area.