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Acoustic and seismic imaging of the active Adra Fault (NE Alboran Sea): In search for the source of the 1910 Adra Earthquake
Gràcia, E.; Bartolomé, R.; Lo Iacono, C.; Moreno Mota, Ximena; Stich, D.; Martínez-Diaz, J.J.; Bozzano, G.; Martínez-Loriente, S.; Perea Manera, Héctor; Masana, Eulàlia; Dañobeitia, J.J.; Tello, O.; Sanz, J.L.; Carreño, E.
Universitat de Barcelona
Recently acquired swath-bathymetry data and high-resolution seismic reflection profiles offshore Adra (Almería, Spain) reveal the surficial expression of a NW-SE trending 20 km-long fault, which we termed the Adra Fault. Seismic imaging across the structure depicts a sub-vertical fault reaching the seafloor surface and slightly dipping to the NE showing an along-axis structural variability. Our new data suggest normal displacement of the uppermost units with probably a lateral component. Radiocarbon dating of a gravity core located in the area indicates that seafloor sediments are of Holocene age, suggesting present-day tectonic activity. The NE Alboran Sea area is characterized by significant low-magnitude earthquakes and by historical records of moderate magnitude, such as the Mw = 6.1 1910 Adra Earthquake. The location, dimension and kinematics of the Adra Fault agree with the fault solution and magnitude of the 1910 Adra Earthquake, whose moment tensor analysis indicates normal-dextral motion. The fault seismic parameters indicate that the Adra Fault is a potential source of large magnitude (Mw ≤ 6.5) earthquakes, which represents an unreported seismic hazard for the neighbouring coastal areas
Tectònica de plaques
Falles (Geologia)
Terratrèmols
Sismologia
Plate tectonics
Faults (Geology)
Earthquakes
Seismology
cc-by (c) Gràcia, E. et al., 2012
http://creativecommons.org/licenses/by/3.0/es
Article
info:eu-repo/semantics/publishedVersion
European Geosciences Union (EGU)
         

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