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Title: Acoustic and seismic imaging of the active Adra Fault (NE Alboran Sea): In search for the source of the 1910 Adra Earthquake
Author: Gràcia, Enric
Bartolomé de la Peña, Rafael
Lo Iacono, Claudio
Moreno Mota, Ximena
Stich, D.
Martínez-Díaz, José J.
Bozzano, Graziella
Martínez Loriente, Sara
Perea Manera, Héctor
Masana, Eulàlia
Dañobeitia, Juan José
Tello, O.
Sanz, J. L.
Carreño, E.
Keywords: Tectònica de plaques
Falles (Geologia)
Plate tectonics
Faults (Geology)
Issue Date: 2012
Publisher: European Geosciences Union (EGU)
Abstract: 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
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It is part of: Natural Hazards And Earth System Sciences, 2012, vol. 12, num. 11, p. 3255-3268
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ISSN: 1561-8633
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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