Mapping active faults offshore Portugal (36°N–38°N): implications for seismic hazard assessment along the southwest Iberian margin

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dc.contributor.author	Gràcia, Eulàlia
dc.contributor.author	Dañobeitia, Juan José
dc.contributor.author	Vergés, Jaume
dc.date	2003-01-01
dc.identifier.citation	Gràcia, E.; Dañobeitia, J.; Vergés, J. Mapping active faults offshore Portugal (36°N–38°N): implications for seismic hazard assessment along the southwest Iberian margin. "Geology", 01 Gener 2003, vol. 31, núm. 1, p. 83-86.
dc.identifier.citation	0091-7613
dc.identifier.citation	10.1130/0091-7613(2003)¿031
dc.identifier.uri	http://hdl.handle.net/2117/14097
dc.language.iso	eng
dc.relation	http://www.ija.csic.es/gt/gdl/jverges/PDF/Gr%E0cia_et_al_2003.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Àrees temàtiques de la UPC::Enginyeria civil::Geologia
dc.subject	Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Sismologia
dc.subject	Faults (Geology) -- Atlantic Ocean
dc.subject	Lisbon Earthquake -- Portugal -- 1755
dc.subject	Seismic data
dc.subject	Ocean bottom -- Research
dc.subject	Terratrèmols -- Anàlisi
dc.subject	Falles (Geologia)
dc.subject	Fons marins -- Investigació
dc.subject	Terratrèmols -- Lisboa (Portugal) -- 1755
dc.title	Mapping active faults offshore Portugal (36°N–38°N): implications for seismic hazard assessment along the southwest Iberian margin
dc.type	info:eu-repo/semantics/publishedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	Swath-bathymetry and acoustic-backscatter data from the southwest Iberian margin, which hosts the present-day boundary between the European and African plates, reveal the surficial expression of several fault structures <100 km offshore of Portugal. High-resolution and multichannel seismic reflection profiles collected perpendicular to these structures show folding and reverse faulting of the Quaternary units, suggesting present-day tectonic activity. Successive submarine-landslide deposits at the base of the scarps provide evidence of cyclic fault activity. The location and dimension of these newly identified structures agree with the modeled source suggested for the A.D. 1755 Lisbon earthquake and tsunami, possibly the most destructive event in western Europe during historical time. These fault escarpments and deformed seafloor sediments associated with a cluster of shallow seismicity suggest that these thrusts are active and may pose a significant earthquake and tsunami hazard to the coasts of Portugal, Spain, and Morocco.
dc.description.abstract	Peer Reviewed

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