Landslide susceptibility and hazard: Examples from the global, regional and local scale
Landslide susceptibility describes the inherent properties of terrain which might make it more or less susceptible to failure e.g. geology, slope angle, elevation etc. For a landslide to initiate from a susceptible area of terrain a landslide trigger is required. This can typically be rainfall, but could also be ground shaking from an earthquake or related to human activity. If a landslide is triggered then it is referred to as a landslide hazard and will have landslide hazard metrics related to size, velocity and frequency of occurrence.
An area can be of high landslide susceptibility but low landslide hazard if there is not the potential for a trigger of sufficient magnitude. Similarly, an area can be of low landslide susceptibility but high landslide hazard if there is the potential for a sufficiently large trigger.
This Focus Day event further explores the concepts of landslide susceptibility and hazard at a range of scales, incorporating insights from the NASA Global Landslide Susceptibility Map and the new GFDRR-commissioned Global Landslide Hazard Map by Arup. These global examples are supported by recent high-profile landslide case studies from Freetown, Sierra Leone, and Palu, Indonesia, as well as interactive group activities for participants during the session.