Joint probabilistic inversion of DC resistivity and seismic refraction data applied to bedrock/regolith interface delineation

Pasquale, Giulia De; Linde, Niklas; Greenwood, Andrew

doi:10.1016/j.jappgeo.2019.103839

Cited by 17 publications

(8 citation statements)

References 40 publications

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“…In the literature [8,9] it has been demonstrated that with the practical use of the seismoelectric method, the most informative is the study of the recorded electrical signals. This is due to two factors.…”

Section: Mathematical Description Of the Seismoelectric Methods Of Monitoring The Ground Bed Of Railway Tracksmentioning

confidence: 99%

“…Currently, to obtain information about the structure of the upper layers of various geological environments, ground-penetrating radar sounding [7], vibroseismic methods [8][9][10][11], electrometric [9][10][11][12] and some other methods are traditionally used. But in some cases, such as when karst cavities have a developed structure, analysis by groups of these methods is very difficult [13,14].…”

Section: Literature Reviewmentioning

confidence: 99%

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Mathematical Description and Laboratory Study of Electrophysical Methods of Localization of Geodeformational Changes during the Control of the Railway Roadbed

et al. 2021

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Currently, the load on railway tracks is increasing due to the increase in freight traffic. Accordingly, more and more serious requirements are being imposed on the reliability of the roadbed, which means that studies of methods for monitoring the integrity of the railway roadbed are relevant. The article provides a mathematical substantiation of the possibility of using seismoelectric and phasemetric methods of geoelectric control of the roadbed of railway tracks in order to identify defects and deformations at an early stage of their occurrence. The methods of laboratory modeling of the natural–technical system “railway track” are considered in order to assess the prospects of using the presented methods. The results of laboratory studies are presented, which have shown their high efficiency in registering a weak useful electrical signal caused by seismoacoustic effects against the background of high-level external industrial and natural interference. In the course of laboratory modeling, it was found that on the amplitude spectra of the output electrical signals of the investigated geological medium in the presence of an elastic harmonic action with a frequency of 70 Hz, the frequency of a harmonic electrical signal with a frequency of 40 Hz is observed. In laboratory modeling, phase images were obtained for the receiving line when simulating the process of sinking the soil base of the railway bed, confirming the presence of a transient process that causes a shift in the initial phase of the signal Δφ = 40° by ~45° (Δφ’ = 85°), which allows detection of the initial stage of failure formation.

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Section: Mathematical Description Of the Seismoelectric Methods Of Monitoring The Ground Bed Of Railway Tracksmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Mathematical Description and Laboratory Study of Electrophysical Methods of Localization of Geodeformational Changes during the Control of the Railway Roadbed

et al. 2021

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“…As for other structurally-constrained inversions, where the roughness operator is only manipulated once, this static approach is dependent of the validity of the guiding image. Alternatively, the position of a sharp interface may be estimated during the joint inversion, as demonstrated in the context of bedrock detection by means of probabilistic joint inversion of electrical resistivity and seismic refraction data (de Pasquale et al, 2019). We expect that the recent availability of open and versatile geological modeling tools (e.g., de la Varga et al, 2019) will pave the way for an improved amalgamation of geophysical and geological data in joint structure-based inversion frameworks (e.g., Güdük et al, 2021;Förderer et al, 2021).…”

Section: Incorporation Of Geological Realismmentioning

confidence: 99%

An overview of multimethod imaging approaches in environmental geophysics

Wagner

Uhlemann

2021

Advances in Geophysics

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Quantitative characterization of subsurface properties is critical for many environmental applications and serves as the basis to simulate and better understand dynamic subsurface processes. Geophysical imaging methods allow to image subsurface property distributions and monitor their spatio-temporal changes in a minimally-invasive manner. While it is widely agreed upon that models integrating multiple independent data sources are more reliable, the number of approaches to do so is increasing rapidly and often overwhelming for researchers and, particularly, novices to the field.With this work, we aim to contribute to the development multi-method imaging through (1) an overview of, and didactic introduction to, existing inversion approaches for the integration of multiple geophysical data sets with other measurement types (e.g., hydrological observations), petrophysical models, and process simulations, (2) a state-of-the-art review on the use and potentials of these approaches in various environmental applications, and (3) a discussion on new frontiers and remaining challenges in the field.We hope that this chapter provides an entry point to recent developments in multimethod geophysical imaging, clarifies similarities, differences and development potentials of existing approaches, and ultimately helps practitioners to choose the optimum one to integrate their data sets.

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“…DC Electrical Resistivity and Refraction Seismic are the most popular geophysical methods in engineering site assessments. This is due to the fact that spatial distribution of the electrical resistivity and longitudinal wave velocity of subsurface materials are closely related, among other factors, to porosity and fluid content, ( Meju et al., 2003 ; Carcione et al., 2007 ; De Pasquale et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Refraction seismic complementing electrical method in subsurface characterization for tunneling in soft pyroclastic, (a case study)

Fisseha

Mewa

Haile

2021

Heliyon

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The paper highlights the potential drawback of mapping a single geophysical property for subsurface characterization in potential engineering sites. As an exemplary case study, we present the geophysical survey conducted along the surface projection of a tunnel in the quaternary volcanic terrain of the Main Ethiopia Rift. Initially, geoelectrical mapping involving 12 Vertical Electrical Sounding (VES) and a short Electrical Resistivity Imaging (ERI) line, was carried out. The 1D geoelectric model indicates that the formation resistivity at tunnel zone varies from 50 to 500 Ω∙m. The corresponding value on 2D model, (>350 Ω∙m), is also compatible. Based on limited available geological information, the geoelectric horizon was attributed to weathered and variably saturated ignimbrite. Following unexpected encounter during excavation, refraction seismic and core drilling were carried out for additional insights. Tomographic analysis of the seismic arrival times revealed that below a depth of 45 m, (tunnel zone), the velocity substratum is marked by a range, (1200–1800 m/s). Such low velocity range is typical of unconsolidated materials and, thus, cannot rationalize the geoelectrical attribution (ignimbrite). In a joint interpretation, the likely formation that may justify the observed range of the electrical resistivity and low P-wave velocity appears to be unwelded pyroclastic deposit (volcanic ash). Eventually, core samples from the tunnel zone confirmed the presence of thick ash flow. However, the unexpected ground conditions encountered at the early phase, due to insufficient information derived from a single geophysical parameter, caused extra cost and considerable delay.

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Joint probabilistic inversion of DC resistivity and seismic refraction data applied to bedrock/regolith interface delineation

Cited by 17 publications

References 40 publications

Mathematical Description and Laboratory Study of Electrophysical Methods of Localization of Geodeformational Changes during the Control of the Railway Roadbed

Mathematical Description and Laboratory Study of Electrophysical Methods of Localization of Geodeformational Changes during the Control of the Railway Roadbed

An overview of multimethod imaging approaches in environmental geophysics

Refraction seismic complementing electrical method in subsurface characterization for tunneling in soft pyroclastic, (a case study)

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