Serrano, InmaculadaTorcal Medina, FedericoMorales, José2026-03-062026-03-062013-09-23Geophys. J. Int. (2014) 196, 22–33, 2013 October 23, doi: 10.1093/gji/ggt39410.1093/gji/ggt394https://hdl.handle.net/10433/26371Proyectos de investigación This work has been supported by the Comisión Interministerial de Ciencia y Tecnología CICYT (Spain) projects with references CGL2012–31472 (Estructura cortical y litosférica en el Sector Central de la Cordillera Bética y su transición al Macizo Varisco. Sismotectónica del sur-sureste de la Península Ibérica), CGL2009 11384 (Transpresión y reparto de la deformación en la rama norte del Arco de Gibraltar (25 m.a.-Reciente): registro estructural, evolución tectónica y modelización); Proyectos de Excelencia de la Junta de Andalucía (Spain) P09-RNM-5100 (Estructura 3D del Arco de Gibraltar y modelado numérico de la propagación de ondas sísmicas de terremotos en la zona de contacto de placa Nubia Eurasia) and P08-RNM-03713 (Dinámica del Sistema del Arco de Gibraltar: Estudios geológicos multidisciplinares tierra-mar y evolución 4D); and Grupo de Investigación de la Junta de Andalucía (Spain) RNM-104, Sismología y Geofísica.SUMMARY In this study we have used high-resolution P- and S-wave velocity results to estimate crack density (ε, epsilon) and saturation ratio (ξ, xi) at a depth of 2km in an intramountain basin and surrounding regions. Detailed observations of gravity, seismic profile and geological data reveal high ε consistent with large sedimentary thickness and minimum ε coinciding with elevations arising from the basement of the basin. From the distribution of seismic measurements of ξ it is possible to identify the presence of aquifers in detrital sediments, sandstone and dolostone. However, ξ does not show significant changes for the aquifers in geological formations made up also of schists and marbles. A low ξ anomaly in the western part could be associated with Triassic evaporite and clay rocks, and high values of ξ in the southwestern part near thermal springs may be imaging the intricate system of fractures which connect at depth with aquifer rocks.application/pdfenAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/PermeabilityPorositySeismicityTectonicsFracturesFaultsEuropejournal articleopen access