Advanced multichannel seismic reflection processing techniques applied to improve imaging of active faults from the Alboran Sea

Abstract

[EN] Along the Alboran Basin (Western Mediterranean) is located the diffuse plate boundary between Iberia and Africa. This wide deformation zone is controlled by the NW-SE convergence of these two plates. Deformation is accommodated by a large number of faults, where are placed offshore and onshore. The Alboran basin has a complex evolution, and the processes which led to the basin formation in the early Miocene are still under discussion. It is an active zone, so it involves a seismic and tsunamigenic hazard for the region. With the objective of improve the knowledge of this area, the TOPOMED-GASSIS cruise took place in October 2011. During this cruise, a deep penetration dataset was acquired using new instruments that allow the imaging of the basin at a crustal scale. The result is a series of multichannel seismic profiles with unprecedented quality in the region, which permit to use state of the art processing and imaging techniques to obtain the deep tectonic structure of the plate boundary and also a good resolution in the sedimentary infill of the basin. Moreover, we carried out Pre-Stack Depth Migration algorithms to selected profiles, in order to show the real geometry of the structures in depth and also to obtain the fault parameters

[ES] En la cuenca de Alborán (Mediterráneo Occidental) se sitúa el límite entre las placas Iberia y África, un límite difuso donde la convergencia NO-SE se acomoda en una ancha zona de deformación a lo largo de numerosas fallas. La evolución de la cuenca es compleja, y los procesos de formación siguen siendo objeto de debate. Sísmicamente es una zona activa, suponiendo un riesgo para la región. Para ampliar el conocimiento de esta zona, se realizó la campaña TOPOMED-GASSIS (Octubre 2011), en la que el uso de nuevos instrumentos de adquisición permitió obtener datos de sísmica de reflexión multicanal profunda con una calidad sin precedentes en la zona. Utilizando técnicas de procesado punteras, se ha conseguido una imagen a escala cortical de la cuenca. Además, se ha realizado la migración en profundidad de ciertos perfiles, para obtener la geometría real de las estructuras y los parámetros de falla