El deslizamiento de Dúdar (Granada, sur de España)un caso de interacción entre inestabilidades de ladera, tectónica activa y redes de drenaje

Abstract

In this work a geomorphologic description of the Dúdar landslide (Granada, S Spain) has been carried out using a high-resolution digital elevation model derived from LIDAR (Light Detection and Ranging) data. This mega-landslide develops significant changes in both landscape and drainage system of the Aguas Blancas and Darro rivers. These modifications comprise river diversions, river captures and active incision within the body of the landslide, making it susceptible to potential reactivations. The active tectonic of the NE border of the Granada Basin is the main controlling factor of the landslide, since it causes a strong differential erosion which develops large topographical differences in the relief of the basins of the Darro and Aguas Blancas rivers. A stability back-analysis of the landslide has been performed to identify the most-likely triggering factors. This analysis shows that a low-to-moderate magnitude earthquake (Mw 5.0-6.5), related to the active faults in the NE border of the Granada Basin, seems to be the main triggering factor of the Dúdar landslide.