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Título: | Tsunamigenic structures in the Gulf of Cadiz and the workflow for tsunami hazard assessment |
Autor: | Sànchez-Serra, Cristina CSIC ORCID ; Gràcia, Eulàlia CSIC ORCID ; Urgeles, Roger CSIC ORCID ; Martínez-Loriente, S. CSIC ORCID ; Gómez de la Peña, L. CSIC ORCID; Lorito, Stefano; Piatanesi, Alessio; Romano, Fabrizio; Maesano, Francesco; Basili, Roberto; Volpe, Manuela | Fecha de publicación: | jun-2019 | Citación: | 4th Fault2SHA Workshop (2019) | Resumen: | The southwestern margin of the Iberian Peninsula, which includes the Gulf of Cadiz, is characterized by a present -day active deformation mainly driven by the NW-SE trending convergence (3.8-5.6 mm.yr-1) between the Nubia and Eurasia plates. The SW Iberian margin is a seismogenic area characterized by low to moderate magnitudes (Mw ≤ 5.5). In addition, this area hosts some of the largest earthquakes occurred in Western Europe, such as the 1st of November 1755 Lisbon Earthquake and tsunami (Mw ≥ 8.5). The active fault structures can be classified in two main families: a) WNW-ESE trending dextral strike-slip faults, and b) NE-SW trending thrusts faults. To characterize the seismogenic and tsunamigenic potential of each fault system, we develop several tsunami models. The workflow involves the following tasks: 1. Interpretation of the seismic profiles (in time) defining the traces of main active faults; 2. Mapping the trace of the faults using multibeam bathymetry; 3. Mesh of the fault surface and their respective horizons to generate a 3D model of the subsurface for each fault; 4. Conversion of the 3D model from time-to-depth assigning a velocity value (i.e. from available velocity models of the area) to the interval between horizons; 5.Defining the specific attributes for each fault, such as Length, Width, Depth, Strike, Dip and Rake; 6. Determine the maximum magnitude and slip for each fault. The maximum magnitude should be compatible with the length and the width previously defined, so we use the Leonard (2014) scaling-law; 7. Finally, the tsunami simulations for each fault have been run using “Tsunami-HySEA” software. We run two simulations for each fault, the first one considering the fault as an inclined planar surface and the second simulations used the 3D mesh | Descripción: | 4th Fault2SHA Workshop, Fault Complex Interaction: Characterization and Integration into Seismic Hazard Assessment (SHA), 3-5 June 2019, Barcelona | URI: | http://hdl.handle.net/10261/188519 |
Aparece en las colecciones: | (ICM) Comunicaciones congresos |
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