Patterns of movement in reactivated landslides

Massey, Chris; Petley, David; McSaveney, Mauri

doi:10.1016/j.enggeo.2013.03.011

Cited by 151 publications

(96 citation statements)

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“…The background pattern is complicated and does not appear to correlate with local porewater pressure. This is similar to the observations on the large Utiku landslide in New Zealand by Massey et al (2013). The explanation for this is unclear -it could be that the landslide responds to porewater trends over the whole of the mass, which may not be captured by the monitoring data reported here, or to some other factor (e.g.…”

Section: Discussionsupporting

confidence: 78%

“…In response to extension the settlement cells measure the vertical deformation of graben. This movement response is consistent with graben behaviour at the rear of a deep-seated landslide where the dominant movement is translational (Massey et al 2013). In addition it…”

Section: Discussionsupporting

confidence: 67%

“…Below this threshold, changes in porewater pressure are not reflected in changes in deformation rate, suggesting that the movement mechanism is different. A similar change in deformation mechanism is observed in other landslides (Alison and Brunsden 1990;Massey et al 2013) and in laboratory studies (Ng and Petley 2009). …”

Section: Discussionmentioning

confidence: 49%

“…Zhou et al, 2010;Massey et al 2013) and linked to drying and wetting causing changes in soil moisture and local volumetric soil shrinkage and swelling. In previous studies, these effects have been shown to occur at shallow depths around the settlement cell and therefore are not the result of landslide movement and they are not controlled by porewater pressure at depth.…”

Section: Discussionmentioning

confidence: 99%

“…Such studies have shown potential, in some instances, to be developed into forecasting methodologies (e.g. Saito, 1965Saito, , 1980Fukuzono, 1990;Petley et al, 2002;Massey et al, 2013), but beyond high-wall mining, reliable behaviour forecasting and failure prediction will only be possible if Manuscript Click here to download Manuscript: 20_10_14 Carey JM Manuscript_rev.doc Click here to view linked References 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 the underlying controls on observed movement patterns are understood. Thus, there is a need for more studies of patterns of movements and their relationship to controlling parameters such as groundwater level and the properties of the failing materials.…”

Section: Introductionmentioning

confidence: 99%

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

2014

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Abstract:The patterns of ground movement were monitored within a large, deep-seated landslide complex at Ventnor in southern England, between May 1998 and June 2002 using automated crackmeters, settlement cells and vibrating wire piezometers. It was found that the landslide maintains a state of marginal instability, such that it is subject to continual very slow deformation. Movement is primarily on a low-angled basal shear surface at >90 metres depth.The movement record shows a series of distinct deformation patterns that vary as groundwater conditions change. Continuous slow deformation occurs across the landslide complex at rates of between 5 -10 mm per year. The background pattern of movement does not appear to correlate with local porewater pressure. Periods of more rapid movement (reaching up to c. 34 mm per year during the monitoring period) were associated with a period of elevated groundwater, although the relationship between movement rate and porewater pressure was complex.The patterns of movement and the landslide geometry suggest that the likelihood of a rapid, catastrophic failure is low. Future episodes of faster movement are likely during periods when porewater pressures at the basal shear surface are elevated above a critical threshold. Whilst the resulting surface deformation damages the town, it is unlikely to occur rapidly without significant changes to the landslide hydrogeology or the stress state within the landslide. marginal instability, such that it is subject to continual very slow deformation. Movement is primarily on a low-angled basal shear surface at >90 metres depth. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems CorporationThe movement record shows a series of distinct deformation patterns that vary as groundwater conditions change. Continuous slow deformation occurs across the landslide complex at rates of between 5 -10 mm per year. The background pattern of movement does not appear to correlate with local porewater pressure. Periods of more rapid movement (reaching up to c. 34 mm per year during the monitoring period) were associated with a period of elevated groundwater, although the relationship between movement rate and porewater pressure was complex.The patterns of movement and the landslide geometry suggest that the likelihood of a rapid, catastrophic failure is low. Future episodes of faster movement are likely during periods when porewater pressures at the basal shear surface are elevated above a critical threshold. Whilst the resulting surface deformation damages the town, it is unlikely to occur rapidly without significant changes to the landslide hydrogeology or the stress state within the landslide.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 49%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2014

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Experimental evidence for shallow, slow‐moving landslides activated by a decrease in ground temperature

Shibasaki

Matsuura

Okamoto

2016

Geophysical Research Letters

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In order to understand the trigger mechanism of slow‐moving landslides occurring in the early cold season from late autumn to winter, we investigated the effect of temperature on the shear strength of slip surface soils. Displacement‐controlled and shear stress‐controlled box shear experiments were performed on undisturbed slip zone soils under residual strength conditions. Test results conducted at temperatures from 9 to 25°C showed remarkable shear strength reductions with decreasing temperature. Creep‐like slow shear displacements were induced by a decrease in temperature. These temperature‐dependent shear behaviors are attributed to the rheological properties of hydrous smectite that dominantly compose the soil material along the failure surface. Our experimental results imply that ground temperature conditions influence slope instability, especially for shallow landslides occurring in smectite‐bearing rock areas.

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Three‐dimensional displacements of a large volcano flank movement during the May 2010 eruptions at Pacaya Volcano, Guatemala

Schaefer

Wang

Escobar-Wolf

et al. 2017

Geophysical Research Letters

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Although massive flank failure is fairly common in the evolution of volcanoes, measurements of flank movement indicative of instability are rare. Here 3‐D displacements from airborne radar amplitude images derived using an amplitude image pixel offset tracking technique show that the west and southwest flanks of Pacaya Volcano in Guatemala experienced large (~4 m), discrete landsliding that was ultimately aborted. Pixel offset tracking improved measurement recovery by nearly 50% over classic interferometric synthetic aperture radar techniques, providing unique measurements at the event. The 3‐D displacement field shows that the flank moved coherently downslope along a complex failure surface involving both rotational and along‐slope movement. Notably, the lack of continuous movement of the slide in the years leading up to the event emphasizes that active movement should not always be expected at volcanoes for which triggering factors (e.g., magmatic intrusions and eruptions) could precipitate sudden major flank instability.

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Patterns of movement in reactivated landslides

Cited by 151 publications

References 13 publications

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

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

Experimental evidence for shallow, slow‐moving landslides activated by a decrease in ground temperature

Three‐dimensional displacements of a large volcano flank movement during the May 2010 eruptions at Pacaya Volcano, Guatemala

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