The Sensitivity of Tsunami Impact to Earthquake Source Parameters and Manning Friction in High-Resolution Inundation Simulations

• DOI: 10.3389/feart.2021.757618
• Publication Date: 2022-01-25T07:23:16Z
• Authors: Steven J. Gibbons; Stefano Lorito; Marc de la Asunción; Manuela Volpe; Jacopo Selva; Jorge Macías; Carlos Sánchez-Li...; Beatriz Brizuela; Malte Vöge; Roberto Tonini; Piero Lanucara; Sylfest Glimsdal; Fabrizio Romano; Jan Christian Meyer; Finn Løvholt
• Keywords: Tsunami earthquake

In seismically active regions with variable dominant focal mechanisms, there is considerable tsunami inundation height uncertainty. Basic earthquake source parameters such as dip, strike, and rake affect significantly the tsunamigenic potential directivity. Tsunami also sensitive to other properties bottom friction. Despite their importance, sensitivity these basic surprisingly sparsely studied in literature. We perform suites of systematic parameter searches investigate at towns Catania Siracusa on Sicily changes both Manning The modelled using Tsunami-HySEA shallow water code a system nested topo-bathymetric grids finest spatial resolution 10 m. This GPU-based model, significant HPC resources, allows us large numbers high-resolution simulations. analyze variability different hydrodynamic due earthquakes uniform slip locations, depth, parameters. consider sources near coastline, which near-shore co-seismic deformation occurs, offshore, where negligible. For distant offshore sources, we see intuitive rake, depth. dependency far more complicated co-determined by mechanisms coastal morphology. studies provide directions how resolve discretization optimize number Probabilistic Hazard Analysis, they demonstrate need for finer local than sources. small study systematically function coefficient. this varies greatly topo-bathymetry coastline interest. friction affects velocities momentum flux lesser but still extent distance from coastline. An understanding all dependencies needed better quantify hazard when complexity increases.