Patterns of movement in the Ventnor landslide complex, Isle of Wight, southern England

Carey, J. M.; Moore, Roger; Petley, David

doi:10.1007/s10346-014-0538-1

Cited by 24 publications

(15 citation statements)

References 19 publications

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“…10 4f.) Similar behaviour has been observed in non-brittle landslide materials Carey et al, 2015) and in remoulded materials (Ng and Petley, 2009;Carey and Petley, 2014). Thus, behaviour is conventional as a brittle first time failure and followed by ductile reactivation.…”

Section: Deformation Response To Changes In Pore Water Pressuresupporting

confidence: 70%

Displacement mechanisms of slow-moving landslides in response to changes in pore water pressure and dynamic stress

Carey¹,

Massey²,

Lyndsell³

et al. 2018

Preprint

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Although slow-moving landslides represent a substantial hazard, their detailed mechanisms are still poorly understood. We have conducted a suite of innovative laboratory experiments using novel equipment to simulate a range of pore water pressure and dynamic stress scenarios on samples collected from a slow-moving landslide complex in New Zealand. 10We seek to understand how changes in pore water pressure and ground acceleration during earthquakes influence the movement patterns of slow-moving landslides. Our experiments show that during periods of elevated pore water pressure, displacement rates are influenced by two components: first, an absolute stress state component (normal effective stress state) and second, a transient stress state component (the rate of change of normal effective stress). During dynamic shear cycles, displacement rates are controlled by the extent to which the forces operating at the shear surface exceed the stress state at the 15 yield acceleration point. The results indicate that during strong earthquake accelerations, strain will increase rapidly with relatively minor increases in the out of balance forces. Similar behaviour is seen for the generation of movement through increased pore water pressures. Our results show how the mechanisms of shear zone deformation control the movement patterns of many large, slow-moving translational landslides, and how they may be mobilised by strong earthquakes and significant rain events. 20

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Section: Deformation Response To Changes In Pore Water Pressuresupporting

confidence: 70%

Displacement mechanisms of slow-moving landslides in response to changes in pore water pressure and dynamic stress

Carey¹,

Massey²,

Lyndsell³

et al. 2018

Preprint

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show abstract

“…Carey et al 2015) revealed the importance of the relationship between the level of groundwater and pore water pressure. With respect to the fact, that our area of study does not allow us to equip the landslide like in less remote areas, we are looking at the influence of precipitation on slope movement reactivation.…”

Section: Introductionmentioning

confidence: 99%

Reassessment of the development and hazard of the Rampac Grande landslide, Cordillera Negra, Peru

Vilímek

Klimeš

Zapata

2016

Geoenviron Disasters

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Background: The initial investigation analysed the complex Rampac Grande slope deformation from April 2009 (Landslides 8(3):309-320, 2011). The primary research in 2009 also identified an unrealistic explanation (raw mineral exploration) of the triggering of the landslide and the intention of the local authorities (from the administration centre of Carhuaz) to take measures to minimize the possible future risk to the local population. We also examined the adaptation measures introduced by the local authorities to reduce the risk for the local community. Findings: Unstable landslide material has been left after the 2009 event in the sources and transportation zone and several blocks were described as being only in a temporarily stable state. Landslide propagation could also follow the already existing lateral tension cracks identified in 2009. Areas of reactivation from 2012 were localized and triggering precipitation was evaluated. Conclusion: This study concluded that there is still a hazard of remobilization of specific parts of the landslide in Rampac Grande with potentially damaging effects on the buildings located close to the accumulation area.

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“…The same study reviewed council records between 1995 and 2005 for Bath Road and Newport Road, which indicated subsidence of 33.2 and 22 mm a −1 , respectively. Carey et al [32] identified a lag between high rainfall events and pore pressure generation, where a response was recorded after 7 days, however it took approximately 29 days to reach a peak, which then lasted approximately 30 days. The highest rainfall events did not yield the largest displacement responses, rather prolonged rainfall periods led to a higher generation of pore pressures, resulting in larger displacements.…”

Section: Historical Movement and Previous Monitoring Surveys At Ventnormentioning

confidence: 99%

An Investigation into Ground Movement on the Ventnor Landslide Complex, UK Using Persistent Scatterer Interferometry

O’Connor¹,

Mider

Lawrence

et al. 2021

Remote Sensing

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Analysis of ground movement rates along the coastline and upper sections of the Ventnor landslide complex was carried out utilizing Persistent Scatterer Interferometric Synthetic Aperture Radar methods using Sentinel-1 SAR data from 2015 to 2019 (four years). Results were compared with rainfall data, historical ground investigation records and monitoring surveys carried out at Ventnor to relate observations to geology, geomorphology and rainfall. Decomposition of InSAR viewing geometries to vertical and horizontal aligned well with previous ground-based studies. Subsidence of −9.8 mm a−1 at the Lowtherville Graben and heave of +8.5 mm a−1 along the coastline south of Ventnor Park were observed. Decomposition to east-west geometry results showed an eastward displacement of approximately 12.4 mm a−1 along the coastline south of Ventnor Park, and a westward displacement of −3.7 mm a−1 throughout built up sections of Ventnor town, indicating the landslide was displacing more in an eastern direction than vertically. The cause of this movement was investigated by using publicly available intrusive boreholes paired with Persistent Scatterer Interferometry, and a new ground model spanning east-west parallel to the coastline was presented. No evidence of significant ground movement was observed along heavily protected sections of the coastline, suggesting coastal defences comprised of concrete aprons and rip rap appear to be an effective coastal management/landslide stabilisation tool when compared to rip rap alone. The mechanism of this increased stability is likely due to the combination of toe weighting and reduced toe erosion. A lag of approximately 13–20 days was observed between high rainfall events and subsequent peaks in ground displacement, which was shorter than a 29 day lag observed in a previous study. Similar observations of prolonged rainfall resulting in prolonged displacements were also observed. The study demonstrates the capabilities of the PSI methodology in identifying the same ground movements that conventional methods provide. By providing detailed analysis of ground deformation of the Ventnor landslide, we demonstrate small ground movements, validated with existing ground movement surveys. Similar methodology can be applied to coastal landslides in urban environments worldwide, providing a relatively cheap and rapid resource for coastal landslide monitoring.

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Patterns of movement in the Ventnor landslide complex, Isle of Wight, southern England

Cited by 24 publications

References 19 publications

Displacement mechanisms of slow-moving landslides in response to changes in pore water pressure and dynamic stress

Displacement mechanisms of slow-moving landslides in response to changes in pore water pressure and dynamic stress

Reassessment of the development and hazard of the Rampac Grande landslide, Cordillera Negra, Peru

An Investigation into Ground Movement on the Ventnor Landslide Complex, UK Using Persistent Scatterer Interferometry

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