Falles actives, terratrèmols i tsunamis al sistema de l'Arc de Gibraltar
Geological hazards, such as earthquakes and tsunamis, are a major societal concern. Seismogenic faults may be silent in the instrumental and historical periods, and their seismic potential may remain inadvertently hidden, especially in areas of slow tectonic deformation with faults able to generate large-magnitude earthquakes (Mw > 6) with long recurrence intervals (103-104 years). This is the case of the active faults in the Gibraltar Arc System (Alboran Sea and Gulf of Cadiz), which hosts the convergent boundary between the Iberian and Nubia plates (4.5-5.6 mm/yr). Our dataset results from an integration of acoustic and seismic data acquired with a multiscale approach, utilizing AUV near-bottom bathymetry, shipboard bathymetry, high-resolution seismics and deep penetration multichannel seismics (MCS). We follow a multi-scale approach to characterize and built realistic marine fault source models from selected reverse and strike-slip fault systems in the Gulf of Cadiz (Marques de Pombal, Lineament South) and Alboran Basin (Carboneras, Yusuf and Al-Idrissi FS). The present-day crustal deformation of the south Iberian margin is driven by the NW-SE convergence (4.5-5.6 mm/yr) between the Nubia and Eurasian plates. This convergence accommodates over a wide deformation zone with significant activity south of the Iberian Peninsula, which includes the Gulf of Cadiz (Atlantic) and the Alboran Sea (Western Mediterranean). Here, instrumental seismicity is characterized by seismic events of low to moderate magnitude (Mw < 5.5). Nevertheless, large destructive earthquakes (Intensity IX-X and up to Mw 8.5) occurred in the region as revealed by historical and instrumental records. According to fault trend, geometry and time of activity, fault systems divide in different segments that if linked, may have the potential to generate large earthquakes and associated tsunamis
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| Format: | material didáctico biblioteca |
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CSIC - Instituto de Ciencias del Mar (ICM)
2018-06-08
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| Online Access: | http://hdl.handle.net/10261/195459 |
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