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



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Gràcia Mont, Eulalia and Bartolomé de la Peña, Rafael and Lo Iacono, C. and Moreno, X. and Stich, Daniel and Martínez Díaz, José J. and Bozzano, G. and Martínez Loriente, Sara and Perea, H. and Díez Tagarro, Susana and Masana, Eulàlia and Dañobeitia, J.J. and Tello, O. and Sanz, J.L. and Carreño, E. and Farran, M. and Andara, E. and Pérez, S. and Román Alpiste, M.J. (2012) Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake. Natural Hazards and Earth System Sciences, 12 . pp. 3255-3267. ISSN 1684-9981

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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 subvertical 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.

Item Type:Article
Uncontrolled Keywords:Adra, Almería, Spain, Earthquake
Subjects:Sciences > Geology > Geodynamics
ID Code:36038
Deposited On:01 Mar 2016 11:38
Last Modified:03 Mar 2016 11:08

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