Beyond the infinite slope: Using topographic data to explore landslide controls

Lidar is a promising tool for evaluating the hazard and behavior of unstable slopes due to its resolution, accuracy, and the ability to process away visual obstacles, such as vegetation. Elevation models processed from lidar are particularly useful as they enable quantitative and enhanced qualitative interpretation of landslide features, and in the case of repeat data collection, evaluation of kinematics and changes that are not easily discernable by eye. Most of all, when integrated with principles of slope stability analysis, lidar data serves as a robust foundation for understanding landslide behavior at multiple scales. This presentation will discuss (1) use of lidar for deriving first-order estimates of landslide volumes and strength from forensic analysis of inventories, (2) use of digital elevation models and slope stability analyses towards creating landslide susceptibility maps for seismic and precipitation disturbance under a variety of remotely-sensed antecedent moisture conditions, and (3) interpretation of lidar to reveal drivers and change for landslides in Oregon’s coastal environment. The increasing availability of lidar presents us with a unique opportunity to better assess the risk stemming from geohazards, and understand geomorphic and geologic processes more quantitatively.

Leshchinsky (2022) Beyond the infinite slope: Using topographic data to explore landslide controls. USGS Landslide Hazards Seminar, 21 September 2022.