Permanent electrical resistivity measurements for monitoring water circulation in clayey landslides

Gance, Julien; Malet, Jean‐Philippe; Supper, R.; Sailhac, Pascal; Ottowitz, David; Jochum, Birgit

doi:10.1016/j.jappgeo.2016.01.011

Cited by 60 publications

(37 citation statements)

References 52 publications

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“…Based on these features, and using previous studies (Gomberg et al, 1995;Joswig, 2008, 2009;Gomberg et al, 2011;Walter et al, 2012;Tonnellier et al, 2013;Provost et al, 2017) as a benchmark, microseismic events detected at clayey landslides are gathered in three main groups, which we describe and discuss in Sect. 4:…”

Section: Classificationmentioning

confidence: 99%

“…The shear boundaries of the Slumgullion earthflow in Colorado were first investigated by Gomberg et al (1995) as a strike-slip fault zone analog. The study confirmed the existence of detectable brittle deformation processes associated with slide deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Observed near microseismic signals (source-receiver distances < 500-1000 m) comprise microearthquake events, for which Gomberg et al (1995) introduced the term "slidequake". Such events have been reported both at rock and debris slides and are inferred to be associated with fracture processes in the host rock, at the sliding surface or within the landslide body.…”

Section: Introductionmentioning

confidence: 99%

“…Rockfall and rock-avalanche signals were also characterized at steep debris slides and at rock slides (Helmstetter and Garambois, 2010;Walter et al, 2012;Tonnellier et al, 2013;Provost et al, 2017). In addition, a wide variety of tremor signals have been reported marginally (Gomberg et al, 1995;Brückl and Mertl, 2006;Mertl and Brückl, 2007;Spillmann et al, 2007;Gomberg et al, 2011;Walter et al, 2012;Tonnellier et al, 2013;Provost et al, 2017). No common typology has yet been suggested for these signals and the signal source interpretation remains speculative.…”

Section: Introductionmentioning

confidence: 99%

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Characterizing the complexity of microseismic signals at slow-moving clay-rich debris slides: the Super-Sauze (southeastern France) and Pechgraben (Upper Austria) case studies

2018

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Abstract. Soil and debris slides are prone to rapid and dramatic reactivation. Deformation within the instability is accommodated by sliding, whereby weak seismic energies are released through material deformation. Thus, passive microseismic monitoring provides information that relates to the slope dynamics. In this study, passive microseismic data acquired at Super-Sauze (southeastern France) and Pechgraben (Upper Austria) slow-moving clay-rich debris slides ("clayey landslides") are investigated. Observations are benchmarked against previous similar case studies to provide a comprehensive and homogenized typology of microseismic signals at clayey landslides. A thorough knowledge of the various microseismic signals generated by slope deformation is crucial for the future development of automatic detection systems to be implemented in landslide early-warning systems. Detected signals range from short-duration (< 2 s) quake-like signals to a wide variety of longer-duration tremor-like radiations (> 2 s -several min). The complexity of seismic velocity structures, the low quantity and low quality of available signal onsets and non-optimal seismic network geometry severely impedes the source location procedure; thus, rendering source processes characterization challenging. Therefore, we constrain sources' locations using the prominent waveform amplitude attenuation pattern characteristic of near-source area (< about 50 m) landslide-induced microseismic events. A local magnitude scale for clayey landslides (M L−LS ) is empirically calibrated using calibration shots and hammer blow data. The derived M L−LS returns daily landslideinduced microseismicity rates that positively correlate with higher average daily displacement rates. However, high temporal and spatial resolution analyses of the landslide dynamics and hydrology are required to better decipher the potential relations linking landslide-induced microseismic signals to landslide deformation.

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Section: Classificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterizing the complexity of microseismic signals at slow-moving clay-rich debris slides: the Super-Sauze (southeastern France) and Pechgraben (Upper Austria) case studies

2018

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“…It is worth noting that recent case studies have illustrated the ability of 3D ERT methods to monitor soil moisture dynamics in the field (e.g., [10][11]) and in laboratory (e.g., [12]): this 4D ERT methodology is often referred to a time-lapse ERT method.…”

Section: Physical Principles and Methodologiesmentioning

confidence: 99%

Indirect determination of soil water content

Cosenza

2016

E3S Web Conf.

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Abstract. This manuscript reviews the recent developments in indirect methods used to measure soil watent content (SWC). It focuses on three types of methodological approaches: (i) high-frequency electromagnetic methodologies (dielectric methods and Ground Penetrating Radar), (ii) low-frequency electromagnetic methods (resistivity method and spectral induced polarization-SIP) and (iii) emerging methods (laboratory and ground-based nuclear magnetic resonance-NMR techniques and methods based on fiber optic temperature sensing systems). For each method the physical principles and the corresponding methodology are briefly described first, followed by the recent methodological advances. These recent advances address the following issues: (a) integration of different types of sensors to design new multi-functional devices, (b) miniaturization of low-cost and easily-installed electromagnetic sensors, (c) fusion and assimilation of data acquired from multiple modalities with different sampling rates and spatial resolutions, (d) physical understanding of spectra and distributed parameters measured by SIP and NMR methods, (e) improvement of geophysical inversion techniques combined with fast data acquisitions (4D monitoring of SWC).

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Four‐dimensional imaging of moisture dynamics during landslide reactivation

et al. 2017

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Landslides pose significant risks to communities and infrastructure, and mitigating these risks relies on understanding landslide causes and triggering processes. It has been shown that geophysical surveys can significantly contribute to the characterization of unstable slopes. However, hydrological processes can be temporally and spatially heterogeneous, requiring their related properties to be monitored over time. Geoelectrical monitoring can provide temporal and volumetric distributions of electrical resistivity, which are directly related to moisture content. To date, studies demonstrating this capability have been restricted to 2‐D sections, which are insufficient to capture the full degree of spatial heterogeneity. This study is the first to employ 4‐D (i.e., 3‐D time lapse) resistivity imaging on an active landslide, providing long‐term data (3 years) highlighting the evolution of moisture content prior to landslide reactivation and showing its decline post reactivation. Crucially, the time‐lapse inversion methodology employed here incorporates movements of the electrodes on the unstable surface. Although seasonal characteristics dominate the shallow moisture dynamics during the first 2 years with surficial drying in summer and wetting in winter, in the months preceding reactivation, moisture content increased by more than 45% throughout the slope. This is in agreement with independent data showing a significant rise in piezometric heads and shallow soil moisture contents as a result of prolonged and intense rainfall. Based on these results, remediation measures could be designed and early‐warning systems implemented. Thus, resistivity monitoring that can allow for moving electrodes provides a new means for the effective mitigation of landslide risk.

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Permanent electrical resistivity measurements for monitoring water circulation in clayey landslides

Cited by 60 publications

References 52 publications

Characterizing the complexity of microseismic signals at slow-moving clay-rich debris slides: the Super-Sauze (southeastern France) and Pechgraben (Upper Austria) case studies

Characterizing the complexity of microseismic signals at slow-moving clay-rich debris slides: the Super-Sauze (southeastern France) and Pechgraben (Upper Austria) case studies

Indirect determination of soil water content

Four‐dimensional imaging of moisture dynamics during landslide reactivation

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