Deep-seated gravitational slope deformations along the active Boconó Fault in the central portion of the Mérida Andes, western Venezuela

Audemard, Franck; Beck, Christian; Carrillo, Eduardo

doi:10.1016/j.geomorph.2010.04.020

Cited by 27 publications

(13 citation statements)

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“…Earthquake shaking as a trigger for lateral spreading in mountain ridges has long been suggested (e.g., Beck, 1968;Radbruch-Hall et al, 1976;Mahr, 1977). The presence of sackungen along active fault zones supports this interpretation (e.g., Audemard et al, 2010;Li et al, 2010;McCalpin et al, 2011). Finally, ridge crest collapses have been observed after severe earthquake shaking in California (Hart et al, 1990;Ponti and Wells, 1991;Harp and Jibson, 1996;McCalpin and Hart, 2003) and Alaska (Jibson et al, 2004).…”

Section: Discussionmentioning

confidence: 91%

10Be ages reveal >12ka of gravitational movement in a major sackung of the Western Alps (France)

et al. 2012

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Section: Discussionmentioning

confidence: 91%

10Be ages reveal >12ka of gravitational movement in a major sackung of the Western Alps (France)

et al. 2012

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“…In the last few decades, deep-seated gravitational slope deformations (DSGSDs) have been established as one of the common geomorphological features of the world's mountain landscapes [1,2]. Since the first studies on these landforms [3][4][5][6], their presence has now been reported for many mountain chains, with numerous examples from across continents [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] and even from other planets [24][25][26]. In these decades, the interest towards the origin and the evolution of these landforms has attracted an increasingly wide amount of studies.…”

Section: Introductionmentioning

confidence: 99%

“…The origin itself of these landforms is still a matter to be settled completely. DSGSDs have in time been associated with the action of tectonic stress [18,[29][30][31], seismicity [6,14,32,33], groundwater regime and karst processes [20,27,29,34,35], glacial rebound [36][37][38][39], lithology and bedding [18,27,40,41]-usually in combination with each other. The complex interactions between these factors strongly influence further development and behaviour of DSGSDs, which often undergo cycles of dormancy and reactivation.…”

Section: Introductionmentioning

confidence: 99%

Surface Geomorphological Features of Deep-Seated Gravitational Slope Deformations: A Look to the Role of Lithostructure (N Apennines, Italy)

Mariani

Zerboni

2020

Geosciences

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The attention to deep-seated gravitational slope deformations (DSGSDs) has steadily increased in the last few decades, because such features are ubiquitous in mountain areas. Their geomorphological surface expression, especially when related to the effects of lithostructural control in sedimentary stratified bedrocks, is well characterized in theory, but sometimes not as well documented in field cases. In this contribution the investigation of several DSGSDs in the area of the Northern Apennines of Italy is reported. A survey of the area was conducted using fast and low-cost satellite imaging techniques, in order to describe the surface features of selected DSGSDs and verify how their occurrence is linked to the effect of lithostructural constrains such as bedding and folding. Surface features developed in parallel to the strike of the slope are mostly related to the main gravitative strain acting on the deformation. Features along slope dip are instead formed by the release of tension caused by compressive forces at the landslide foot or by the presence of pre-existing weak lines. One example of a DSGSD, formed on the hinge of a vertical fold, shows a corrugated appearance due to the release of vertical fractures that mask most other features usually associated with DSGSDs. This potentially impairs the detection of these landforms during field and remote surveys.

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“…Giant, very slow rock slope deformations known as deep-seated gravitational slope deformations (DSGSD) are widespread in high mountain environments worldwide [1][2][3][4][5]. The evolution of these phenomena is strongly constrained by inherited geological structure and long-term climatic forcing and occurs through progressive damage accumulation.…”

Section: Introductionmentioning

confidence: 99%

Unraveling Spatial and Temporal Heterogeneities of Very Slow Rock-Slope Deformations with Targeted DInSAR Analyses

et al. 2020

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Spaceborne radar interferometry is a powerful tool to characterize landslides at local and regional scales. However, its application to very slow rock slope deformations in alpine environments (displacement rates < 5 cm/year) remains challenging, mainly due to low signal to noise ratio, atmospheric disturbances, snow cover effects, and complexities resulting from heterogeneous displacement in space and time. Here we combine SqueeSARTM data, targeted multi-temporal baseline DInSAR, GPS data, and detailed field morpho-structural mapping, to unravel the kinematics, internal segmentation, and style of activity of the Mt. Mater deep-seated gravitational slope deformation (DSGSD) in Valle Spluga (Italy). We retrieve slope kinematics by performing 2D decomposition (2D InSAR) of SqueeSARTM products derived from Sentinel-1 data acquired in ascending and descending orbits. To achieve a spatially-distributed characterization of DSGSD displacement patterns and activity, we process Sentinel-1 A/B images (2016-2019) with increasing temporal baselines (ranging from 24-days to 1-year) and generate several multi-temporal interferograms. Unwrapped displacement maps are validated using ground-based GPS data. Interferograms derived with different temporal baselines reveal a strong kinematic and morpho-structural heterogeneity and outline nested rockslides and active sectors, that arise from the background displacement signal of the main DSGSD. Seasonal interferograms, supported by GPS displacement measurements, reveal non-linear displacement trends suggesting a complex response of different slope sectors to rainfall and snowmelt. Our analyses clearly outline a composite slope instability with different nested sectors possibly undergoing different evolutionary trends towards failure. The results herein outline the potential of a targeted use of DInSAR for the detailed investigation of very slow rock slope deformations in different geological and geomorphological settings.

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Deep-seated gravitational slope deformations along the active Boconó Fault in the central portion of the Mérida Andes, western Venezuela

Cited by 27 publications

References 50 publications

10Be ages reveal >12ka of gravitational movement in a major sackung of the Western Alps (France)

10Be ages reveal >12ka of gravitational movement in a major sackung of the Western Alps (France)

Surface Geomorphological Features of Deep-Seated Gravitational Slope Deformations: A Look to the Role of Lithostructure (N Apennines, Italy)

Unraveling Spatial and Temporal Heterogeneities of Very Slow Rock-Slope Deformations with Targeted DInSAR Analyses

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