عنوان مقاله [English]
The Iranian plateau is one of the seismic active zones of shallow crustal earthquakes in the world so that annually thousands earthquake occurs in the Iranian plateau. Meanwhile, as effect of topographic and geological characteristics of its relief, the Iranian plateau is subject to diffuse phenomena of landslide, especially in Alborz and Zagros mountains, which are exacerbated by the high seismic activity. The earthquake-induced landslides have reportedly caused major human fatalities and economic losses in Iran. The prediction of sliding displacement can decrease landslide hazards. The semi-empirical models have recently received more attention from the geotechnical earthquake engineering practitioners because of their applicability, simplicity, and reasonable performance in large displacements. The rigid block-rotation approach was developed based on the increase of critical acceleration along with the downward movement of sliding soil mass which provides reasonable results. Nevertheless, a few semi-empirical models have been generated to predict seismic displacement of Iranian slopes. This paper represents a semi-empirical model for earthquake-induced displacement of Iran’s slopes using the rigid block-rotation approach. A collection of 3954 strong motion records associated with 738 Iranian earthquakes is used to generate the model based on the results of sliding analyses. The semi-empirical model is presented based on more than 138,000 rigid block-rotation analyses of several different parameters. The regression model predicts sliding displacement in terms of yield coefficient ( ), slip length of sliding mass ( ), and Arias Intensity ( ). It is shown slip length of sliding mass has the important role for prediction of seismic permanent displacement, which was ignored the role of slip length in previous semi-empirical models. The proposed semi-empirical model fit the data with the reasonable degree of accuracy. The proposed model can be simply used to estimate the deterministic and probabilistic of earthquake-induced landslide hazard in seismic prone regions of the Iranian plateau.