Improving landslide inventories by combining satellite interferometry and landscape analysis: the case of Sierra Nevada (Southern Spain)

Reyes-Carmona, Cristina; Galve, Jorge Pedro; Pérez-Peña, José Vicente; Moreno-Sánchez, Marcos; Alfonso-Jorde, David; Ballesteros, Daniel; Torre, Davide; Azañón, José Miguel; Mateos, Rosa María

doi:10.1007/s10346-023-02071-1

Cited by 5 publications

(3 citation statements)

References 105 publications

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“…We surmise that patterns of settlement footprints on slow-moving landslides reflect an interaction between human decisions to retain geographical benefits amid landslide-prone areas [13,14], establish settlements in settings limited by steep terrain [22,23,19,3], and avoid flood exposure [21,37,20]. Our model indicates the fraction of landslides inhabited across IPCC regions grows with the urbanization, except in WCA (Fig.…”

Section: Response Of Settlement Areas To Floods and Landslidesmentioning

confidence: 78%

“…8). Most landslides of WCA are in the Alai Range, Kyrgyzstan, where convex profiles created by rotational movements [53] provide benches along hillslopes that are suitable to accommodate villages [23,22]. Major urban centers in Kyrgyzstan between valley floodplains and foothills [19] indicate that built-up areas in WCA could be constrained by steep slopes.…”

Section: Exposure Responds To Floods Over Slow-moving Landslidesmentioning

confidence: 99%

“…In steep terrain, many slopes that appear amenable to human settlements may host slow-moving landslides [22,23,24]. These landslides are mass movements of coherent soil and rock moving along discrete shear zones [5,11] and can involve entire continuously deforming hillslopes [24,10].…”

Section: Introductionmentioning

confidence: 99%

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Human settlement pressure drives slow-moving landslide exposure

Ferrer,

Mohor,

Dewitte

et al. 2024

Preprint

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The rapidly growing population in many mountain regions is pressuring expansion onto steeper slopes, increasingly exposing people and their assets to slow-moving landslides [1, 2, 3, 4]. These moving hillslopes can inflict damage to buildings and infrastructure [5, 6], accelerate with urban alterations [7, 8], and catastrophically fail with climatic and weather extremes [9,10,11]. Cities in mountains especially face growing pressure from rising and migrating populations [12] seeking out economic opportunity [13,14]. Yet, systematic estimates of this exposure have been elusive [15,16]. Here, we identify from a new global database of 7,764 slow-moving landslides those that sustain human settlements to estimate their exposure across nine di↵erent IPCC mountain-risk regions [1]. Across most of these regions, we find that exposure to slow-moving landslides increases with sprawling urbanized areas, though clearly not with steeper terrain. We show regional contrasts in how exposure to floods may drive people to settle on moving hillslopes. East Asia stands out in how slowmoving landslide exposure increases in more urbanized basins with gentler slopes and less flood exposure. Our findings reveal how disparate knowledge creates uncertainty that undermines an assessment of the drivers of landslide exposure in regions facing increasing mountain risks, such as Central Asia, Northeast Africa, and the Tibetan Plateau.

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Section: Response Of Settlement Areas To Floods and Landslidesmentioning

confidence: 78%

Section: Exposure Responds To Floods Over Slow-moving Landslidesmentioning

confidence: 99%

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Human settlement pressure drives slow-moving landslide exposure

Ferrer,

Mohor,

Dewitte

et al. 2024

Preprint

Self Cite

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Geomorphological assessment as basic complement of InSAR analysis for landslide processes understanding

Torre,

Galve,

Reyes-Carmona

et al. 2024

Landslides

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Landslide research has benefited greatly from advances in remote sensing techniques. However, the recent increase in available data on land surface movement provided by InSAR techniques can lead to identifying only those areas that were active during data acquisition as hazardous, overlooking other potentially unsafe areas or neglecting landslide-specific geological settings in hazard assessments. Here, we present a case study that serves as a reminder for landslide researchers to carefully consider the geology and geomorphology of study areas where complex active movements are detected using InSAR technology. In an area extensively studied using InSAR and UAV-related techniques, we provide new insights by applying classical approaches. The area is the coastal stretch of La Herradura, and its importance lies in the fact that it has served as an illustrative example in the Product User Manual of the European Ground Motion Service, a platform that provides ground motion data on a European scale. Our approach is to revisit the area and carry out qualitative geological and geomorphological assessments supported by UAV surveys and GIS spatial analysis on a broader scale than previously published investigations. Our classical approach has yielded the following new observations, crucial for risk assessment and land management: active landslides identified by InSAR techniques since 2015 are bodies nested within large mass movements that affect entire slopes. A variety of processes contribute to slope dynamics, such as large slumps, marble rock spreading and block sliding, and surface rock falls and topples. The revised delineation of the landslide bodies reveals an area almost five times larger than previously mapped. These new findings in a well-known area highlight (1) the importance of updating and downscaling previous maps and (2) the ongoing importance of classical fieldwork and desk studies as basic complements to modern InSAR analyses.

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