David Gómez Ortiz, Rosa Blanca Babín Vich
Con objeto de reconstruir la geometría de las fallas inversas presentes en el Sistema Central, se ha realizado un estudio sobre 22 pliegues de propagación de falla generados durante la orogenia alpina que han sido cartografiados en la banda cretácica que, con dirección marcada y constante NESO, aflora en la Hoja del Mapa Topográfico Nacional a escala 1:50.000, nº 457 (Turégano). Para ello se han aplicado tres modelos diferentes: Suppe y Medwedeff (1990), Jamison (1987) y Chester y Chester (1990), comparando posteriormente los resultados obtenidos en cada uno de ellos. En los tres casos los valores obtenidos son muy similares, pero existe una mayor precisión cuanto más abundantes son los datos de afloramiento. En aquellas ocasiones en que sólo aflora el sinclinal, el modelo de Jamison (1987) presenta serias dificultades a la hora de calcular el buzamiento de las fallas.
In order to reconstruct the geometry of the thrust faults at depth, a total of 22 fault-propagation folds generated during the Alpine Orogeny, which are affecting Cretaceous rocks, were studied. The folds, located in the central-eastern portion of the Spanish Central System, show a marked north-east orientation. The Suppe & Medwedeff (1990), Jamison (1987) and Chester & Chester (1990) methods were applied and the obtained results were compared each other. Strong similarities between the values obtained from the three methods indicate their validity for this type of studies. As expected, precision in the results increases as the number of measurements in the outcrops is higher. However, in those cases where the anticline structure has been eroded out and only the syncline is present, application of the model proposed by Jamison (1987) to reconstruct the final geometry of the faults shows serious problems.
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