... structures are generally rooted. Towards the northwestern mountain front of the cordillera, S... more ... structures are generally rooted. Towards the northwestern mountain front of the cordillera, Subbetic Units are widely deformed and show a chaotic structure (Pérez-López and Sanz de Galdeano, 1994). These Subbetic Chaotic ...
ABSTRACT Gravity can be considered an optimal geophysical method for cave detection, give the hig... more ABSTRACT Gravity can be considered an optimal geophysical method for cave detection, give the high density contrast between an empty cavity and the surrounding materials. A number of methods can be used for regional and residual gravity anomaly separation, although they have not been tested in natural scenarios. With the purpose of comparing the different methods, we calculate the residual anomalies associated with the karst system of Gruta de las Maravillas whose cave morphology and dimensions are well-known. A total of 1857 field measurements, mostly distributed in a regular grid of 10 x 10 m, cover the studied area. The microgravity data were acquired using a Scintrex CG5 gravimeter and topography control was carried out with a differential GPS. Regional anomaly maps were calculated by means of several algorithms to generate the corresponding residual gravimetric maps: polynomial first-order fitting, Fast Fourier Transformation with an upward continuation filter, moving average, minimum curvature and kriging methods. Results are analysed and discussed in terms of resolution, implying the capacity to detect shallow voids. We propose that polynomial fitting is the best technique when microgravity data are used to obtain the residual anomaly maps for cave detection.
The Gibraltar Arc, formed by the alpine Betic and Rif Cordillera, surrounds the western Alborán S... more The Gibraltar Arc, formed by the alpine Betic and Rif Cordillera, surrounds the western Alborán Sea and is located on the Eurasian-African plate boundary. In a region with a complex geological setting, several tectonic models have been proposed up to present, but they are not fully supported due to the absence of detailed geophysical data on the deep structure. In
We present a new set of brittle microtectonic measurements carried out in the Pliocene and Quater... more We present a new set of brittle microtectonic measurements carried out in the Pliocene and Quaternary rocks outcropping in several key sectors of the western Betic and Rif orogen, the so-called Gibraltar orogenic arc. This data set, along with available earthquake focal mechanisms and borehole breakouts, allowed us to compile the Pliocene and Quaternary stress map of this area. This
... structures are generally rooted. Towards the northwestern mountain front of the cordillera, S... more ... structures are generally rooted. Towards the northwestern mountain front of the cordillera, Subbetic Units are widely deformed and show a chaotic structure (Pérez-López and Sanz de Galdeano, 1994). These Subbetic Chaotic ...
ABSTRACT Gravity can be considered an optimal geophysical method for cave detection, give the hig... more ABSTRACT Gravity can be considered an optimal geophysical method for cave detection, give the high density contrast between an empty cavity and the surrounding materials. A number of methods can be used for regional and residual gravity anomaly separation, although they have not been tested in natural scenarios. With the purpose of comparing the different methods, we calculate the residual anomalies associated with the karst system of Gruta de las Maravillas whose cave morphology and dimensions are well-known. A total of 1857 field measurements, mostly distributed in a regular grid of 10 x 10 m, cover the studied area. The microgravity data were acquired using a Scintrex CG5 gravimeter and topography control was carried out with a differential GPS. Regional anomaly maps were calculated by means of several algorithms to generate the corresponding residual gravimetric maps: polynomial first-order fitting, Fast Fourier Transformation with an upward continuation filter, moving average, minimum curvature and kriging methods. Results are analysed and discussed in terms of resolution, implying the capacity to detect shallow voids. We propose that polynomial fitting is the best technique when microgravity data are used to obtain the residual anomaly maps for cave detection.
The Gibraltar Arc, formed by the alpine Betic and Rif Cordillera, surrounds the western Alborán S... more The Gibraltar Arc, formed by the alpine Betic and Rif Cordillera, surrounds the western Alborán Sea and is located on the Eurasian-African plate boundary. In a region with a complex geological setting, several tectonic models have been proposed up to present, but they are not fully supported due to the absence of detailed geophysical data on the deep structure. In
We present a new set of brittle microtectonic measurements carried out in the Pliocene and Quater... more We present a new set of brittle microtectonic measurements carried out in the Pliocene and Quaternary rocks outcropping in several key sectors of the western Betic and Rif orogen, the so-called Gibraltar orogenic arc. This data set, along with available earthquake focal mechanisms and borehole breakouts, allowed us to compile the Pliocene and Quaternary stress map of this area. This
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Papers by A. Pedrera