EAGER: Catastrophic landslide dynamics from seismic wave inversion and satellite remote sensing

Columbia University, New York NY

Investigators

Abstract

EAGER: Catastrophic landslide dynamics from seismic wave inversion and satellite remote sensing This proposal seeks to address the following issue: Do the seismic waves generated by catastrophic slope failure retain enough information on the forces driving a landslide to allow inference of its dynamics? The dynamics of large, fast-moving landslides are poorly understood for two reasons: (1) the physics of multi-phase sliding and granular flow is complex; (2) empirical constraints on such catastrophic failures are rare, and direct measurements of properties such as acceleration and velocity are almost non-existent. Landslide seismology has the potential to fill the data gap by making remote measurements of the dynamics of mass movement, but the field is in its infancy and fundamental questions need to be answered before major investment in it can be justified. Consequently, this project is focused on a proof of concept of the fundamental methodology behind landslide seismology. The project aims to develop a method for inverting the long-period seismic waves induced during the motion of massive, rapidly accelerating landslides, and evaluate the validity of the forces, accelerations, momenta and energies inferred from it. Emphasis in this pilot study will be on analysis of catastrophic landslides described in the literature for which global broadband seismological data are available. The aim of this study is to develop the ability to detect catastrophic landslides remotely and in near-real-time. This has obvious benefits to communities engaged in natural hazards mitigation and disaster management, notably in cases where massive slope failures strike in remote areas or under conditions where communications are severely compromised. In addition, application of this tool to the global archive of broadband seismology data will enable the collection of a wealth of new information on catastrophic landslide dynamics, which will serve a wide range of science and engineering communities concerned with slope instability.