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

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 s...

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Detalles Bibliográficos
Autores: Gràcia Mont, Eulalia, Bartolomé de la Peña, Rafael, Lo Iacono, C., Moreno, X., Stich, Daniel, Bozzano, G., Martínez Loriente, Sara, Perea, H., Martínez Díaz, José Jesús, Díez Tagarro, Susana, Masana, Eulàlia, Dañobeitia, J.J., Tello, O., Sanz, J.L., Carreño, E., Farran, M., Andara, E., Pérez, S., Román Alpiste, M.J.
Tipo de recurso: artículo
Fecha de publicación:2012
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/44923
Acceso en línea:https://hdl.handle.net/20.500.14352/44923
Access Level:acceso abierto
Palabra clave:550.34(460.358)
Adra
Almería
Spain
Earthquake
Geodinámica
2507 Geofísica
Descripción
Sumario: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.

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