Scenario Seismic Landslide Hazard Assessment Using both Spectrum and Energy Compatible Artificial Acceleration Accelerograms at Slope Sites

The northern slope of Tianshui area, Northwest of China, is a high-risk area for earthquake landslides with group of huge landslides. With the development of the economy, its seismic landslide hazard assessment under specific earthquake scenario is urgently needed. In order to bring suitable seismic inputs, an artificial synthetic accelerograms generation method is adopted. The acceleration response spectrum and Arias Intensity at bedrock are estimated through empirical attenuation relationships. Seismic effects of slope site are determined using microtremor observations. The artificial synthetic accelerograms are generated by the method proposed by Li et al. (2017), which introduce an energy compatible algorithm to the spectrum-compatible mode to match both the estimated response spectrum in the frequency domain and Arias Intensity in the time domain. The artificial acceleration time histories are then combined with the slope threshold accelerations to calculated cumulative displacements by double integration. Potentially unstable areas are identified based on the predicted Newmark displacements. The results can be utilized by local government for detailed risk evaluation, civil protection, and emergency plans, as well as for engineering design of critical structures.