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espanolEn este trabajo se analizan tres perfiles sismicos de refraccion y reflexion de gran angulo registrados en los Pirineos con el fin de aportar nuevos conocimientos sobre su estructura cortical. Se emplearon como fuente sismica varios terremotos de magnitud superior a 2.5 ocurridos en las proximidades de las lineas a estudiar. Se demuestra la viabilidad de utilizar sismicidad natural como fuente sismica para la realizacion de perfiles de gran angulo, lo que permite aprovechar despliegues dispuestos con otros objetivos. Se analizaran dos perfiles localizados en el Pirineo oriental (Cataluna) con direcciones N-S y E-O, y un tercero en el Pirineo occidental (Navarra) con direccion NE-SO, desplegados inicialmente para el registro de telesismos y el analisis de funciones receptoras. Los perfiles adquiridos en el sector oriental del Pirineo permitieron acotar el techo de la corteza inferior a 20 km de profundidad. El perfil E-O muestra, en su extremo mas oriental, el Moho como una rampa ascendente hacia el este, pasando de los 35-40 km de profundidad en la zona central del perfil a 25 km en su extremo oriental. El perfil de Navarra permitio acotar con gran detalle la estructura cortical del extremo occidental del Pirineo. El modelo obtenido muestra la indentacion de la corteza inferior y media Europea en la corteza Iberica. El Moho Europeo aparece a 30 km de profundidad en la zona central, mientras que el Moho Iberico muestra una rampa buzante hacia el norte, llegando hasta a los 45-50 km de profundidad en su extremo mas septentrional. EnglishIn this study we analyse three wide-angle seismic profiles in the Pyrenees to provide new insights into their crustal structure. Several earthquakes with magnitudes greater than 2.5 that occurred in the vicinity of the analysed profiles have been used as the seismic source. We demonstrate the feasibility of using natural seismicity as the seismic source, which would allow using deployments of seismic stations designed for other objectives. We have analysed a total of three profiles in this study, two of them being located in the eastern Pyrenees (Cataluna) with N-S and E-O directions, and the third in the western Pyrenees (Navarra) with NE-SO orientation. All of them were originally deployed to record teleseisms for receiver function analysis. Profiles in the eastern Pyrenean edge constrain the top of the lower crust at a depth of 20 km. In the easternmost sector of the E-W profile, Moho has been imaged as an eastward rising ramp, with a depth decreasing from 35- 40 km in the middle of the profile to a depth of 25 km in the eastern edge. The Navarra profile allowed us to constrain the crustal structure of the western Pyrenean edge in detail. The obtained model allowed the imaging of the mid-lower crustal indentation between the Iberian and European plates. The European Moho has been constrained at a depth of 30 km in a small region of the central part of the model, whereas the Iberian Moho has been imaged in its northernmost edge dipping northwards to a depth of 45-50 km.

Estudio cortical del Pirineo mediante refracción y reflexión de gran ángulo utilizando terremotos como fuente sísmica natural