Rapid Assessment of the Co-seismic Landslide Hazard Triggered by the 2022 M_s 6.8 Luding Earthquake

Abstract

Co-seismic landslides are a critical secondary hazard of earthquakes in mountainous regions and are driven by a combination of seismic, geological, and geomorphic properties of both the earthquake source and the affected hill slopes. On Sept. 5, 2022, an M_s 6.8 earthquake hit Luding County, Sichuan Province, China, inducing numerous co-seismic landslides. The epicenter was situated in the Xianshuihe fault zone, one of the most active intracontinental faults in the world. Although the Newmark displacement model is a widely-used and straightforward approach for assessing the hazard of co-seismic landslides, it does not account for other factors such as slope aspect, elevation, slope curvature, distance to rivers, and seismic intensity. To address this limitation, we integrated the Newmark displacement model with the analytical hierarchy process, developing a more comprehensive model for assessing the co-seismic landslide hazard in the Luding Earthquake-hit area, where the terrain and clouds prevent the timely collection of co-seismic landslide data. The proposed model considers the physical mechanisms and seismic, geological, and geomorphic factors underlying landslides, making it a more comprehensive tool for conducting rapid co-seismic landslide hazard assessment. The proposed model is expected to facilitate the reduction of co-seismic landslide disasters and the development of preventative measures in steep and complex mountainous regions.

Keywords

Luding Earthquake / landslides / Newmark displacement model / analytical hierarchy process / disaster prevention

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China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature