Abstract
The Lorca Basin has been the object of recent research aimed at studying the phenomena of earthquake-induced landslides and its assessment in the frame of different seismic scenarios. However, it has not been until the 11th May 2011 Lorca earthquakes when it has been possible to conduct a systematic approach to the problem. In this paper we present an inventory of slope instabilities triggered by the Lorca earthquakes which comprises more than 100 cases, mainly rock and soil falls of small size (1–100 \(\hbox {m}^{3}\)). The distribution of these instabilities is here compared to two different earthquake-triggered landslide hazard maps: one considering the occurrence of the most probable earthquake for a 475-years return period in the Lorca Basin \((\hbox {M}_{\mathrm{w}}=5.0)\) based on both low- and high-resolution digital elevation model (DEM); and a second one matching the occurrence of the \(\hbox {M}_{\mathrm{w}}=5.2\) 2011 Lorca earthquake, which was performed using the higher resolution DEM. The most frequent Newmark displacements related to the slope failures triggered by the 2011 Lorca earthquakes are lower than 2 cm in both the hazard scenarios considered. Additionally, the predicted Newmark displacements were correlated to the inventory of slope instabilities to develop a probability of failure equation. The fit seems to be very good since most of the mapped slope failures are located on the higher probability areas. The probability of slope failure in the Lorca Basin for a seismic event similar to the \(\hbox {M}_{\mathrm{w}}\) 5.2 2011 Lorca earthquake can be considered as very low (0–4 %).
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Acknowledgments
This work was supported by research projects FASEGEO (CGL2009-09726) from the Spanish Ministry of Science and Innovation and TECTACT (GR35/10-A-910368): Tectónica Activa, Paleosismicidad y Riesgos asociados from the University Complutense of Madrid. We thank two anonymous reviewers for their constructive revisions that helped to improve the scientific quality of this paper.
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Rodríguez-Peces, M.J., García-Mayordomo, J. & Martínez-Díaz, J.J. Slope instabilities triggered by the 11th May 2011 Lorca earthquake (Murcia, Spain): comparison to previous hazard assessments and proposition of a new hazard map and probability of failure equation. Bull Earthquake Eng 12, 1961–1976 (2014). https://doi.org/10.1007/s10518-013-9509-5
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DOI: https://doi.org/10.1007/s10518-013-9509-5