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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 y Bartolomé de la Peña, Rafael y Lo Iacono, C. y Moreno, X. y Stich, Daniel y Martínez Díaz, José J. y Bozzano, G. y Martínez Loriente, Sara y Perea, H. y Díez Tagarro, Susana y Masana, Eulàlia y Dañobeitia, J.J. y Tello, O. y Sanz, J.L. y Carreño, E. y Farran, M. y Andara, E. y Pérez, S. y 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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URL Oficial: http://www.nat-hazards-earth-syst-sci.net/12/3255/2012/



Resumen

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.


Tipo de documento:Artículo
Palabras clave:Adra, Almería, Spain, Earthquake
Materias:Ciencias > Geología > Geodinámica
Código ID:36038
Depositado:01 Mar 2016 11:38
Última Modificación:03 Mar 2016 11:08

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