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handle: 10261/264086
[ES] El margen SO de la Península Ibérica es una de las zonas más sismogénicas y tsunamigénicas de Europa Occidental, donde han ocurrido grandes terremotos y tsunamis destructivos, tanto en periodo histórico como instrumental. Por este motivo, presentamos un nuevo estudio evaluando la sensibilidad de los escenarios de tsunamis a la geometría de los planos de falla y la distribución del deslizamiento aplicado a las costas del SO de Iberia y del NE de Marruecos. En este trabajo realizamos diversas simulaciones de tsunami considerando la geometría en detalle de las principales fallas activas de la región, incluyendo: las fallas inversas de Gorringe Bank (GBF), Marquês de Pombal (MPF), Horseshoe (HF), North Coral Patch (NCPF) y South Coral Patch (SCPF); y la falla transcurrente del Lineament South (LSF). Empezamos considerando planos de falla simples con deslizamiento uniforme para todas las fallas. A continuación, generamos modelos complejos en 3D de los planos de falla para MPF, HF, NCPF y SCPF en base a un gran conjunto de datos de perfiles de sísmica multicanal 2D. Finalmente, utilizamos varias distribuciones de deslizamiento heterogéneo para el caso de HF. Nuestros modelos de tsunami sugieren que utilizando geometrías de falla complejas y distribuciones de deslizamiento heterogéneas, la altura máxima de la ola (sobre el nivel del mar) en la costa se puede duplicar en comparación con escenarios simples, dónde el tsunami es generado por una falla con geometría planar
[EN] The SW Iberian margin is one of the most seismogenic and tsunamigenic areas in Western Europe, where large historical and instrumental destructive earthquakes and tsunamis have occurred. For this reason, we present a new study to evaluate the sensitivity of the tsunami impact on the coast of SW Iberia and NW Morocco to the fault geometry and slip distribution for local earthquakes. We carried out several tsunami simulations considering the detailed geometry of the main active faults in the region: the Gorringe Bank (GBF), Marquês de Pombal (MPF), Horseshoe (HF), North Coral Patch (NCPF) and South Coral Patch (SCPF) thrust faults, and the Lineament South (LSF) strike-slip fault. We started from relatively simple planar faults featuring uniform slip for all faults; then, based on a large dataset of 2D multi-channel seismic profiles, 3D complex sub-surface models of the fault planes (MPF, HF, NCPF, and SCPF) have been generated. Finally, we used several heterogeneous slip-distributions for the HF case. Our tsunami models suggest that using more complex fault geometries and heterogeneous slip distributions, the peak wave height (about the sea level) at the coastline can be doubled compared to simpler tsunami source scenarios generated by simple fault-plane geometries
X Congreso Geológico de España, 5-7 de julio 2021, Vitoria-Gasteiz.-- 1 page
Peer reviewed
Tsunamis, Geometría compleja de fallas, Distribución heterogénea del deslizamiento
Tsunamis, Geometría compleja de fallas, Distribución heterogénea del deslizamiento
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