Determinants of Landslide Mobility and Landslide Area in Submarine Landslides

Kenneth H. Tiedemann

Keywords

Estimation, Statistical analysis, Model validation, Landslide runout distance, Landslide mobility

Abstract

There are two central concepts in the analysis of mobility of landslides: the run-out distance which is defined as the horizontal distance between the initial centre of mass of the sliding material and the centre of mass of the sliding material subsequent to the landslide and the area which is defined as the total area affected by the landslide. Using multivariate regression analysis for a comprehensive set of 83 submarine landslides off the coast of the continental United States, this paper examines the determinants of landslide mobility. Key findings are as follows. First, a 1% increase in landslide volume leads to a 0.40% reduction in mobility, while the presence of a cohesive landslide leads to a 0.66% increase in mobility. Second, a 1% increase in volume leads to a 0.85% increase in area, while the presence of a cohesive landslide leads to a 0.21% reduction in area. Third, a fixed effects model may be appropriate in pooling samples across regions.

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