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Title

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

AuthorsGràcia, Eulàlia CSIC ORCID ; Bartolomé, Rafael CSIC ORCID CVN ; Lo Iacono, Claudio CSIC ORCID; Moreno, Ximena CSIC; Martínez-Díaz, J. J. CSIC ORCID ; Martínez-Loriente, S. CSIC ORCID ; Perea, Héctor ; Díez Tagarró, Susana CSIC ORCID ; Dañobeitia, Juan José CSIC ORCID ; Tello-Antón, María Olvido; Sanz, José Luis; EVENT-SHELF Team
Issue DateNov-2012
PublisherEuropean Geosciences Union
CitationNatural Hazards and Earth System Sciences 12(11): 3255-3267 (2012)
AbstractRecently 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
Description13 pages, 7 figures, 1 table
Publisher version (URL)https://doi.org/10.5194/nhess-12-3255-2012
URIhttp://hdl.handle.net/10261/64147
DOI10.5194/nhess-12-3255-2012
ISSN1561-8633
E-ISSN1684-9981
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