HR: 09:15h
AN: OS31A-06 INVITED     [PDF]
TI: Tsunami landslide source models as a tool for analyzing complex case studies
AU: * Grilli, S T
EM: grilli@oce.uri.edu
AF: Department of Ocean Engineering, University of Rhode Island, Narragansett, RI 02882 United States
AU: Watts, P
EM: phil.watts@appliedfluids.com
AF: Applied Fluids Engineering Inc., PMB \#237,5710 E 7th Street, Long Beach, CA 90803 United States
AU: Kirby, J T
EM: Kirby@udel.edu
AF: Center for Applied Coastal Research, University of Delaware, Newark, DE 19716 United States
AB: In tsunami generation, coseismic displacement sources can essentially be considered as having negligible duration (i.e., of a few to a few dozen seconds), as compared to characteristic times of tsunami propagation (i.e., period of at least several minutes). By contrast, submarine landslides, when they occur in or near very deep water areas, may last for a much longer time and thus produce tsunami sources of significant duration as compared to tsunami period. In analyzing data from landslide tsunami case studies, and in particular wave data, it is therefore very important to be able to understand the full history of both landslide and tsunami generation, in order to accurately estimate landslide time of failure based on such data. Recent three-dimensional (3D) hydrodynamic models developed to simulate tsunami generation by complex landslide scenarios offer such possibilities. Using these models, together with field data, the authors were able to identify both likely types and times of failure in specific case studies, in order to reproduce at best the observations in both the near and far field. To obtain far field results, the modeled 3D tsunami source is used as initial condition in a two-dimensional long wave propagation model. The cases of Skagway, PNG, and Unimak 1946 will be specifically discussed.
UR: http://www.oce.uri.edu/~grilli
DE: 4255 Numerical modeling
DE: 4564 Tsunamis and storm surges
DE: 7223 Seismic hazard assessment and prediction
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting