Title:
|
Acoustic and seismic imaging of the active Adra Fault (NE Alboran Sea): In search for the source of the 1910 Adra Earthquake
|
Author:
|
Gràcia, Enric; Bartolomé de la Peña, Rafael; Lo Iacono, C.; Moreno Mota, Ximena; Stich, D.; Martínez-Diaz, J. J.; Bozzano, G.; Martínez Loriente, Sara; Perea Manera, Héctor; Masana, Eulàlia; Dañobeitia, Juan José; Tello, O.; Sanz, J. L.; Carreño, E.
|
Other authors:
|
Universitat de Barcelona |
Abstract:
|
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 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 |
Subject(s):
|
-Tectònica de plaques -Falles (Geologia) -Terratrèmols -Sismologia -Plate tectonics -Faults (Geology) -Earthquakes -Seismology |
Rights:
|
cc-by (c) Gràcia, E. et al., 2012
http://creativecommons.org/licenses/by/3.0/es |
Document type:
|
Article Article - Published version |
Published by:
|
European Geosciences Union (EGU)
|
Share:
|
|