24th Glossop Lecture: Landslide Risk Assessment: Radical Uncertainty and Engineering Geomorphology Dr. Mark Lee, Ebor Geoscience Limited, York Abstract Assessment of landslide risks requires an understanding of how future landslide behaviour (the hazard) could have an adverse impact on people, property and the environment (the consequences). However, what will happen in the future cannot be known precisely, and often cannot be predicted with confidence. This ‘radical uncertainty’ results from incomplete knowledge about the slope systems and the response to energy inputs (e.g. waves, rainfall, earthquakes). Probability is a measure of uncertainty. However, estimating landslide probability should not rely on ‘geology-free’ statistical models. The geology does matter. It will be necesiour are key to landslide risk assessment. The focus is on predictions of landslide probability made for economic risk assessments on the UK’s Yorkshire coast. This coast is associated with rapid cliff recession rates (e.g. the Holderness coast) and major landslide events (e.g. the Holbeck Hall landslide, Scarborough). However, the lecture’s central messages can apply to landslide risk studies everywhere, both at the coast and inland. Show more