This is a a non-peer reviewed preprint of the article that has just been published in Landslides.

When an active landslide is first identified in an artificial reservoir, a comprehensive study has to be quickly conducted to analyse the possible hazard that it may represent to such a critical infrastructure. This paper presents the case of the El Arrecife Landslide, located in a slope of the Rules Reservoir (Southern Spain), as an example of geological and motion data integration for elaborating a preliminary hazard assessment. For this purpose, a field survey was carried out to define the kinematics of the landslide: translational in favour of a specific foliation set, and rotational at the foot of the landslide. A possible failure surface has been proposed, as well as an estimation of the volume of the landslide: 14.7 million m3. At the same time, remote sensing and geophysical techniques were applied to obtain historical displacement rates. A mean subsidence rate of up to 2 cm/yr was obtained by means of Synthetic Aperture Radar Interferometry (InSAR) and Ground Penetrating Radar (GPR) data, during the last 5 and 22 years, respectively. The Structure-from-Motion (SfM) technique provided a higher rate, up to 26 cm/yr during the last 14 years, due to compaction of a slag heap located within the foot of the landslide. All of this collected information will be valuable to optimise the planning of future monitoring surveys (i.e. Differential Global Positioning Systems, inclinometers, ground drilling and InSAR) that should be applied in order to prevent further damage on the reservoir and related infrastructures.

No abstract

<p>In karst coastal areas, speleothems preserved in karst caves were widely used to date the seashore emersion, as well as to infer its uplifting rate. Likewise, speleothems would be also used to approach rates of coastal subsidence. Landscape evolution and tectonic driving of Southern Spain is being investigated by relief GIS-analysis, geomorphological indicators, fault analysis and geochronology in the framework of the Spain-funded project titled “Morphomed” (PID2019-107138RB-I00). In the Westernmost Mediterranean Sea, Granada coast shows carbonate cliffs interrupted by bays and inlets filled by delta, alluvial fan and other deposits. Alluvial sediments were deposited on marine terraces located below sea level according to previous gravity and seismic studies. Cliffs barely preserve sediments such as landslides, alluvial fan deposits and karst deposits within fracture caves. Karst deposits comprise speleothems and cave detrital infills, containing fossils of continental gastropods (probably genus <em>Iberus</em>). A total of fifteen speleothems collected in a transect from sea level to 220 m altitude, were dated by the <sup>238</sup>U-<sup>230</sup>Th method in Jiaotong University (China). The dating revealed ages older than 650 ka for speleothems located throughout the transect from the cliff bottom to the higher altitude areas. Field observations and datations points out the occurrence of a Chibanian karst in Granada cliff coast, but with a lack of any documented uplifting evidence (e.g., Upper Pleistocene-Holocene speleothems / raised marine deposits). This fact clashes with the occurrence of well-developed marine terraces and clear emerged Quaternary marine deposits reported in nearby shore areas sited to the West (Malaga coast) and to the East (Almeria coast) of the study area. Altogether, preliminary results suggest the relative subsidence of Granada coast since at least the Chibanian, which agrees the occurrence of submerged marine terraces and the tectonic setting defined by previous works.</p>