New insights on the Salmon Falls Creek Canyon landslide complex based on geomorphological analysis and multitemporal satellite InSAR techniques

Necsoiu, Marius; McGinnis, Ronald N.; Hooper, D. M.

doi:10.1007/s10346-014-0523-8

Cited by 25 publications

(17 citation statements)

References 33 publications

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“…S1 in the Supplement), particularly at their margins, likely reflecting low residual strengths and possibly differential stresses related to suspected ongoing creep. Failures < 1 Mm 3 in size occur yearly and happen mainly during the rainy season (December-March) (O'Hare and Rivas, 2005;Roberts, 2016). In contrast, of the seven historic landslides larger than 1 Mm 3 , four happened during the dry season (April-November; Table S1 in the Supplement).…”

Section: La Paz Regionmentioning

confidence: 99%

Changes in ground deformation prior to and following a large urban landslide in La Paz, Bolivia, revealed by advanced InSAR

Roberts

Rabus

Clague

et al. 2019

Nat. Hazards Earth Syst. Sci.

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Abstract. We characterize and compare creep preceding and following the complex 2011 Pampahasi landslide (∼40 Mm3±50 %) in the city of La Paz, Bolivia, using spaceborne radar interferometry (InSAR) that combines displacement records from both distributed and point scatterers. The failure remobilized deposits of an ancient complex landslide in weakly cemented, predominantly fine-grained sediments and affected ∼1.5 km2 of suburban development. During the 30 months preceding failure, about half of the toe area was creeping at 3–8 cm a−1 and localized parts of the scarp area showed displacements of up to 14 cm a−1. Changes in deformation in the 10 months following the landslide demonstrate an increase in slope activity and indicate that stress redistribution resulting from the discrete failure decreased stability of parts of the slope. During that period, most of the landslide toe and areas near the head scarp accelerated, respectively, to 4–14 and 14 cm a−1. The extent of deformation increased to cover most, or probably all, of the 2011 landslide as well as adjacent parts of the slope and plateau above. The InSAR-measured displacement patterns, supplemented by field observations and optical satellite images, reveal complex slope activity; kinematically complex, steady-state creep along pre-existing sliding surfaces accelerated in response to heavy rainfall, after which slightly faster and expanded steady creeping was re-established. This case study demonstrates that high-quality ground-surface motion fields derived using spaceborne InSAR can help to characterize creep mechanisms, quantify spatial and temporal patterns of slope activity, and identify isolated small-scale instabilities; such details are especially useful where knowledge of landslide extent and activity is limited. Characterizing slope activity before, during, and after the 2011 Pampahasi landslide is particularly important for understanding landslide hazard in La Paz, half of which is underlain by similar large paleolandslides.

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Section: La Paz Regionmentioning

confidence: 99%

Changes in ground deformation prior to and following a large urban landslide in La Paz, Bolivia, revealed by advanced InSAR

Roberts

Rabus

Clague

et al. 2019

Nat. Hazards Earth Syst. Sci.

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“…Additionally, it provides time histories for multi-pixel clusters representing homogeneous distributed scatterers. Like SBAS-InSAR, HDS-InSAR characterizes strongly non-linear motion (Necsoiu et al, 2014) using the higher continuity coverage (Lauknes et al, 2010) of distributed targets. Unlike SBAS-InSAR, however, it does not significantly diminish phase quality or reduce spatial resolution.…”

Section: Hds-insar 25mentioning

confidence: 99%

“…Numerous studies show evidence of long-term, generally sustained creep of slow-moving landslides (e.g. Colesanti and Wasowski, 2006;Lauknes et al, 2010;Hermanns et al, 2013b;Necsoiu et al, 2014;Schlögel et al, 5 2016), and in many cases document temporal variability in displacements. A much smaller number of studies identify shortterm deformation between successive scenes (Moro et al, 2011) or creep leading up to catastrophic failure (Carlà et al, 2018;Intrieri et al, 2018).…”

Section: Comparison With Other Studiesmentioning

confidence: 99%

Changes in ground deformation prior to and following a large urban landslide in La Paz, Bolivia revealed by advanced InSAR

Roberts¹,

Rabus²,

Clague³

et al. 2018

Preprint

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We characterize and compare creep preceding and following the 2011 Pampahasi landslide (~40 Mm 3 ± 50%) in the city of La Paz, Bolivia, using spaceborne RADAR interferometry (InSAR) that combines displacement records from both distributed and point scatterers. The failure remobilised deposits of an ancient landslide in weakly cemented, predominantly 15 fine-grained sediments and affected ~1.5 km 2 of suburban development. During the 30 months preceding failure, about half of the toe area was creeping at 3-8 cm/a and localized parts of the scarp area showed displacements of up to 14 cm/a. Changes in deformation in the 10 months following the landslide are contrary to the common assumption that stress released during a discrete failure increases stability. During that period, most of the landslide toe and areas near the headscarp accelerated, respectively, to 4-14 and 14 cm/a. The extent of deformation increased to cover most, or probably all, of the 20 2011 landslide as well as adjacent parts of the slope and plateau above. The InSAR-measured displacement patternssupplemented by field observations and by optical satellite images -indicate that kinematically complex, steady-state creep along pre-existing sliding surfaces temporarily accelerated in response to heavy rainfall, after which the slope quickly achieved a slightly faster and expanded steadily creeping state. This case study demonstrates that high-quality groundsurface motion fields derived using spaceborne InSAR can help to characterize creep mechanisms, quantify spatial and 25 temporal patterns of slope activity, and identify isolated small-scale instabilities. Characterizing slope instability before, during, and after the 2011 Pampahasi landslide is particularly important for understanding landslide hazard in La Paz, half of which is underlain by similar, large paleolandslides.Nat.

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“…In this paper, considering the SBAS InSAR method performed better than the PS InSAR method with respect to the aspects of analysing the nonlinear displacement rate and reducing the effects of spatial and temporal decorrelation (Lauknes et al 2010;Shanker et al 2011;Necsoiu et al 2014), we used the SBAS InSAR technology with data from ENVISAT ASAR (acquired from 2004 to 2010) to investigate the spatial and temporal land deformation over Changzhou city, China. Levelling measurements are used to assess the accuracy of the InSAR result.…”

Section: Introductionmentioning

confidence: 99%

Monitoring urban land surface deformation (2004–2010) from InSAR, groundwater and levelling data: A case study of Changzhou city, China

Jiang

et al. 2019

J Earth Syst Sci

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Land deformation caused by the overexploitation of groundwater has become a potential geological hazard in Changzhou, China. To reduce the potential damage from deformation disasters, it is quite necessary to monitor them. In this study, C-band ENVISAT ASAR synthetic aperture radar (SAR) datasets acquired from 2004 to 2010 were processed with the small baseline subset (SBAS) interferometric SAR (InSAR) method to investigate the spatial-temporal distribution of land deformation. Levelling survey data were used to assess the deformation accuracy measured by the InSAR method, and groundwater level data were used to analyse the incentives for deformation. The SBAS InSAR results found several subsidence regions in the Wujin district and the central part of the Zhonglou district. The annual deformation rate calculated from the C-band interferograms ranged from −65 to +35 mm/yr in the line of sight (LOS) direction, and the cumulative subsidence ranged from −0.35 to 0.13 m in the vertical direction. The levelling survey data show that the two measurements are generally consistent. Correlation analysis between the groundwater table and InSAR measurements at six groundwater well stations shows that groundwater recharges can cause land rebound within the Changzhou urban region. However, subsidence was also observed simultaneously with a rising water table, which might have been caused by the status of consolidation of the strata. Our study provides scientific evidence on the management of groundwater extraction and the assessment of land-subsidence hazard.

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New insights on the Salmon Falls Creek Canyon landslide complex based on geomorphological analysis and multitemporal satellite InSAR techniques

Cited by 25 publications

References 33 publications

Changes in ground deformation prior to and following a large urban landslide in La Paz, Bolivia, revealed by advanced InSAR

Changes in ground deformation prior to and following a large urban landslide in La Paz, Bolivia, revealed by advanced InSAR

Changes in ground deformation prior to and following a large urban landslide in La Paz, Bolivia revealed by advanced InSAR

Monitoring urban land surface deformation (2004–2010) from InSAR, groundwater and levelling data: A case study of Changzhou city, China

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