Improving the seismic small-scale modelling by comparison with numerical methods

Pageot, D.; Leparoux, D.; Feuvre, M. Le; Durand, Olivier; Côté, Philippe; Capdeville, Yann

doi:10.1093/gji/ggx309

Cited by 13 publications

(11 citation statements)

References 57 publications

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“…Note that the piezoelectric transducer response, including coupling effects can slightly modify the source waveform. These phenomena have been already pointed out by Bretaudeau et al (2011) and further studied by Pageot et al (2017) who demonstrated their reproducibility. They can be taken into account in numerical simulation by inverting the source wavelet as explained below.…”

Section: The Reduced-scale Measurement Bench Muscmentioning

confidence: 54%

“…The scale ratio for the wavelength is 1000 implying that a distance of 10 m in reality is 10 mm in the laboratory. Note that compared to the ratio presented in Pageot et al (2017), we take into consideration a scale ratio equal to 2 for the seismic velocities. This allows us to simulate near surface media which have low seismic velocities by epoxy resins which have higher seismic velocity due to their stiffness.…”

Section: The Reduced-scale Measurement Bench Muscmentioning

confidence: 99%

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New robust observables on Rayleigh waves affected by an underground cavity: from numerical to experimental modelling

Filippi

Leparoux²,

Grandjean

et al. 2019

Geophysical Journal International

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The investigation and monitoring of shallow hazards due to the presence of underground cavities remain a challenge for geophysical approaches. Thus, seismic surface waves have been tested in several recent research projects in order to detect and localize voids as well as to determine their geometries. Among these works, numerous numerical studies have proved the feasibility of Rayleigh waves to detect cavities. However, most imagery processes adapted to R waves are faced with difficulties when applying them to real data. This limitation points to a major problem: the interactions between Rayleigh waves and a cavity are complex, particularly in the case of dispersing and attenuating surrounding media. Here, a combined approach based on numerical and experimental data obtained in a reduced-scale measurement bench is conducted to better understand the seismic wave propagation phenomena involved in the presence of a cavity and define robust observables that can be used in field measurements. The observables bearing the cavity signature are studied qualitatively and quantitatively on numerical and experimental recordings. The latter take into account all the propagation phenomena involved. The observations are carried out on the vertical and horizontal component of the Rayleigh wave displacement. The selected observables are studied depending on nondimensional cavity's parameters versus the frequency, that is the wavelength-to-size ratio and the wavelength-to-depth ratio. The effects of the cavity's parameters on the observables show particularities as a function of these components, such as a higher rate of the amplitude on the horizontal component as well as a perturbation of the direct seismic surface wave amplitude above the cavity, also higher on the horizontal component. This latter feature is particularly visible on the variation of the elliptical particle motion recorded at the surface. It can be linked to the mode conversions that occur in the vicinity of the cavity and which predominate on the horizontal component when the signal is normalized.

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Section: The Reduced-scale Measurement Bench Muscmentioning

confidence: 54%

Section: The Reduced-scale Measurement Bench Muscmentioning

confidence: 99%

New robust observables on Rayleigh waves affected by an underground cavity: from numerical to experimental modelling

Filippi

Leparoux²,

Grandjean

et al. 2019

Geophysical Journal International

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“…This approach has shown a very good efficiency to assess physical properties of the considered sea dike, even for materials outside the vertical plan defined by the source-receivers line: the resulting model is virtually identical to the true one. An evaluation with more realistic data such as data from experimental small-scale modeling (Bretaudeau et al, 2011;Pageot et al, 2017) must be performed, but it seems at this stage that, even with field data, this method will be able to provide well defined image of the material distribution of a structure and an accurate reference model suitable for perturbation based imaging and monitoring.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Physical Properties of a Sea Dike Using Multichannel Analysis of Surface Waves and 3D Forward Modeling

Pageot¹,

Feuvre²,

Leparoux³

et al. 2017

Proceedings

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Seismic surface waves analysis methods have been widely developed and tested in the context of subsurface characterization and have demonstrated their effectiveness for sounding and monitoring purposes. Given their efficiency, surface waves methods have been used in a variety of contexts, including civil engineering applications. However, at this particular scale, many structures exhibit 3D geometries which drastically limit the efficiency of these methods since they are mostly developed under the assumption of a semi-infinite 1D layered medium without topography. Taking advantages of wave propagation modeling algorithm development and high-performance computing center accessibility, it is now possible to consider the use of a 3D elastic forward modeling algorithm for the inversion of surface wave dispersion. We use a parallelized 3D elastic modeling code based on the spectral element method which allows to obtain accurate synthetic data with very low numerical dispersion and a reasonable numerical cost. In this study, we choose a sea dike as a case example. We first show that their longitudinal geometry and structure may have a significant effect on dispersion diagrams of Rayleigh waves. Then, we investigate the sensitivity of the dispersion diagrams to small velocity and layer thickness perturbations, and show the limitations of the standard 1D surface wave methods approach. Finally, we demonstrate in this context the benefits of using both a 3D forward modeling engine and the whole dispersion diagram, instead of the dispersion curves only.

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“…But for more complex configurations, for instance, setups with strongly curved interfaces generating wave focusing/defocusing, or setups prone to multiple diffractions, a further investigation is necessary. Therefore, the framework must be adapted accordingly, preferentially by following a crossvalidation approach between numerical tools and the laboratory setup (Pageot et al, 2017, Solymosi et al, 2018. Indeed, the comparison between the experimental and numerical results usually emphasizes the improvements of the experimental setup that must be made to increase the accuracy (and decrease the uncertainties) of the experiments, and at the same time, it points out the limitations of the numerical tools that must be tackled.…”

Section: Introductionmentioning

confidence: 99%

Seismic surveying and imaging at the laboratory scale: A framework to cross-validate experiments and simulations for a salt-body environment

et al. 2020

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Laboratory experiments have been recently reintroduced into the ideas-to-applications pipeline for geophysical applications. Benefiting from recent technological advances, we believe that in the coming years, laboratory experiments can play a major role in supporting field experiments and numerical modeling, to explore some of the current challenges of seismic imaging in terms of, for instance, acquisition design or benchmarking of new imaging techniques at a low cost and in an agile way. But having confidence in the quality and accuracy of the experimental data obtained in a complex configuration, which mimics at a reduced scale a real geologic environment, is an essential prerequisite. This requires a robust framework regardless of the configuration studied. Our goal is to provide a global overview of this framework in the context of offshore seismics. To illustrate it, a reduced-scale model is used to represent a 3D complex-shaped salt body buried in sedimentary layers with curved surfaces. Zero-offset and offset reflection data are collected in a water tank, using a conventional pulse-echo technique. Then, a cross-validation approach is applied, which allows us, through comparison between experimental data and the numerical simulation, to point out some necessary future improvements of the laboratory setup to increase the accuracy of the experimental data, and the limitations of the numerical implementation that must also be tackled. Due to this approach, a hierarchical list of points can be collected, to which particular attention should be paid to make laboratory experiments an efficient tool in seismic exploration. Finally, the quality of the complex reduced-scale model and the global framework is successfully validated by applying reverse time migration to the laboratory data.

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Improving the seismic small-scale modelling by comparison with numerical methods

Cited by 13 publications

References 57 publications

New robust observables on Rayleigh waves affected by an underground cavity: from numerical to experimental modelling

New robust observables on Rayleigh waves affected by an underground cavity: from numerical to experimental modelling

Assessment of Physical Properties of a Sea Dike Using Multichannel Analysis of Surface Waves and 3D Forward Modeling

Seismic surveying and imaging at the laboratory scale: A framework to cross-validate experiments and simulations for a salt-body environment

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