TitleAcoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake
Publication TypeJournal Article
Year of Publication2012
AuthorsGràcia E., Bartolome R., C. Iacono L, Moreno X., Stich D., Martínez-Diaz J.J, Bozzano G., Martinez-Loriente S., Perea H., Diez S., Masana E., Danobeitia J.J, Tello O., Sanz J.L, Carreño E.
JournalNatural Hazards and Earth System Science
Date Publishednov
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 Combining double low line 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.© 2013 IEEE.
URLhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84881091009&partnerID=tZOtx3y1 http://digital.csic.es/handle/10261/64147