A 3-D crustal model for SW of Iberia

Elisa Buforn1, Tamara Abajo1, Prof. Maurizio Mattesini, PhD2 and Juan Cantavella3, (1)Complutense University of Madrid, Madrid, Spain, (2)Complutense University of Madrid, Department of Earth's Physics and Astrophysics, Madrid, Spain, (3)Instituto Geográfico Nacional, Madrid, Geofísica, Madrid, Spain
Abstract:
The Iberian Peninsula is located at the western part of Eurasia-Africa plate boundary. The SW of Iberia is a tectonically complex region, where starts the transition from oceanic to continental plate boundary. The occurrence of large and damaging earthquakes in this zone, such as the 1755 Lisbon (Imax=X) or the 1969 (Ms=8.1), with focus of-shore, some of which generates tsunami shows the interest of this region. In order to carry out detailed studies of seismicity and rupture process of these earthquakes is important to have a detailed crustal model. We have retrieved data from refraction and reflection seismic profiles done in the zone in the last 30 years. With this information we have obtained a 3D model for the SW Iberia (between 10.5ºW to 6ºW and 34.5ºN to 38.5ºN) formed by a grid of 0.5ºx0.5º in horizontal and 1 km interval in depth. To check the model we have relocated the 2007 (Mw=5.9) and 2009 (Mw=5.5) earthquakes occurred in this zone using the standard 2D model and the new 3D model. The results show a best depth resolution using the 3D model.
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