Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake

Gràcia, E.; Bartolome, R.; Lo Iacono, C.; Moreno, X.; Stich, D.; Martínez-Diaz, J. J.; Bozzano, G.; Martínez-Loriente, S.; Perea, H.; Diez, S.; Masana, E.; Dañobeitia, J. J.; Tello, O.; Sanz, J. L.; Carreño, E.; EVENT-SHELF Team,

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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Gràcia, E. / Bartolome, R. / Lo Iacono, C. / et al: Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake. 2012. Copernicus Publications.

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