Seismic refraction methodology for groundwater level determination: “Water seismic index”

Grelle, G.; Guadagno, Francesco M.

doi:10.1016/j.jappgeo.2009.02.001

Cited by 71 publications

(40 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This could be related to a transition from unsaturated to saturated sediments within a clayey layer. This is confirmed by the lack of a clear maximum in the velocity gradient related to a thicker unsaturated‐saturated transition, which is characteristic of clay (Grelle and Guadagno ).…”

Section: Discussionmentioning

confidence: 77%

“…Specifically, the delineation of boundaries related to water saturation changes from seismic models may help in the interpretation of this layer. In this study, we define the seismic water table level using both seismic velocity and its gradient since the correlation of only

V p

values with the water table level can be ambiguous (Grelle and Guadagno ).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Integrated geophysical profiles and H/V microtremor measurements for subsoil characterization

Benjumea¹,

Macau²,

Gabàs³

et al. 2011

Near Surface Geophysics

View full text Add to dashboard Cite

Mapping bedrock structure beneath overburden is crucial for understanding geological and hydrogeological processes. Acquiring this information is generally done using well drilling or geophysical surveys; but these studies are expensive and require large periods of acquisition and processing time. In addition, geophysical data acquisition can be logistically challenging in urban zones with limited available areas for instrumentation deployment. Under favourable conditions (1D structure and high acoustic impedance contrast) the H/V microtremor technique can provide estimates of bedrock depth. This technique is used to obtain the soil resonance frequency in seismic microzonation studies. It is based on the computation of the horizontal to vertical spectral ratio of microtremor recordings acquired at a single station. The soil resonance frequency is related to soil shear‐wave velocity and thickness. Here we investigate the capability of combining microtremor and traditional exploration geophysical techniques (electrical resistivity and seismic tomography) to obtain an empirical relationship relating soil resonance frequency and overburden thickness. Subsequently we propose to extend microtremor measurements to adjacent areas that have not been covered by geophysical surveys. This methodology has been applied at a test site located in a granitic environment where alluvial/colluvial sediments cover the granite weathering profile. This area is characterized by urban development and sectors having rugged topography. A priori, this area has suitable conditions to apply the H/V microtremor technique. Overburden thickness has been estimated to range between 20–50 m. The proposed methodology has been validated at the test site, encouraging us to apply the H/V method as an exploration tool in similar geological environments.

show abstract

Section: Discussionmentioning

confidence: 77%

V p

values with the water table level can be ambiguous (Grelle and Guadagno ).…”

Section: Discussionmentioning

confidence: 99%

Integrated geophysical profiles and H/V microtremor measurements for subsoil characterization

Benjumea¹,

Macau²,

Gabàs³

et al. 2011

Near Surface Geophysics

View full text Add to dashboard Cite

show abstract

“…Subsurface shear wave velocities can be deduced from either tomography of shear body waves ( S waves) or by analysis of surface waves (Rayleigh or Love waves), which propagate at a large fraction of the shear velocity. Shear waves can be difficult to generate and detect in typical refraction work and usually require horizontal‐component geophones and specialized sources [e.g., Grelle and Guadagno , ]. The most common way to estimate shear wave velocity in the critical zone is multichannel analysis of surface waves (MASWs), a technique that uses Rayleigh wave dispersion curves to derive (typically) one‐dimensional models of V s beneath a short array [ Xia et al ., ; Socco and Strobbia , ].…”

Section: Background On Geophysical Measurementsmentioning

confidence: 99%

Multiscale geophysical imaging of the critical zone

Parsekian

Singha

Minsley

et al. 2015

Reviews of Geophysics

210

171

View full text Add to dashboard Cite

Details of Earth's shallow subsurface-a key component of the critical zone (CZ)-are largely obscured because making direct observations with sufficient density to capture natural characteristic spatial variability in physical properties is difficult. Yet this inaccessible region of the CZ is fundamental to processes that support ecosystems, society, and the environment. Geophysical methods provide a means for remotely examining CZ form and function over length scales that span centimeters to kilometers. Here we present a review highlighting the application of geophysical methods to CZ science research questions. In particular, we consider the application of geophysical methods to map the geometry of structural features such as regolith thickness, lithological boundaries, permafrost extent, snow thickness, or shallow root zones. Combined with knowledge of structure, we discuss how geophysical observations are used to understand CZ processes. Fluxes between snow, surface water, and groundwater affect weathering, groundwater resources, and chemical and nutrient exports to rivers. The exchange of gas between soil and the atmosphere have been studied using geophysical methods in wetland areas. Indirect geophysical methods are a natural and necessary complement to direct observations obtained by drilling or field mapping. Direct measurements should be used to calibrate geophysical estimates, which can then be used to extrapolate interpretations over larger areas or to monitor changing processes over time. Advances in geophysical instrumentation and computational approaches for integrating different types of data have great potential to fill gaps in our understanding of the shallow subsurface portion of the CZ and should be integrated where possible in future CZ research.

show abstract

“…; Othman ). More recently, this approach has also been proposed for hydrological applications to characterize shallow aquifers (Grelle and Guadagno ; Mota and Monteiro Santos ; Konstantaki et al . ; Pasquet et al .…”

Section: Introductionmentioning

confidence: 99%

“…For these shallow‐target studies, V P and V S are generally retrieved with seismic refraction tomography using both P and SH (shear‐horizontal) waves (Turesson ; Grelle and Guadagno ; Fabien‐Ouellet and Fortier ; Pasquet et al . ).…”

Section: Introductionmentioning

confidence: 99%

2D characterization of near‐surface : surface‐wave dispersion inversion versus refraction tomography

Pasquet

Bodet

Longuevergne

et al. 2015

Near Surface Geophysics

View full text Add to dashboard Cite

International audienceThe joint study of pressure (P-) and shear (S-) wave velocities (Vp and Vs ), as well as their ratio (Vp /Vs), has been used for many years at large scales but remains marginal in near-surface applications. For these applications, and are generally retrieved with seismic refraction tomography combining P and SH (shear-horizontal) waves, thus requiring two separate acquisitions. Surface-wave prospecting methods are proposed here as an alternative to SH-wave tomography in order to retrieve pseudo-2D Vs sections from typical P-wave shot gathers and assess the applicability of combined P-wave refraction tomography and surface-wave dispersion analysis to estimate Vp/Vs ratio. We carried out a simultaneous P- and surface-wave survey on a well-characterized granite-micaschists contact at Ploemeur hydrological observatory (France), supplemented with an SH-wave acquisition along the same line in order to compare Vs results obtained from SH-wave refraction tomography and surface-wave profiling. Travel-time tomography was performed with P- and SH- wave first arrivals observed along the line to retrieve Vtomo p and Vtomo s models. Windowing and stacking techniques were then used to extract evenly spaced dispersion data from P-wave shot gathers along the line. Successive 1D Monte Carlo inversions of these dispersion data were performed using fixed Vp values extracted from Vtomo p the model and no lateral constraints between two adjacent 1D inversions. The resulting 1D Vsw s models were then assembled to create a pseudo-2D Vsw s section, which appears to be correctly matching the general features observed on the section. If the pseudo-section is characterized by strong velocity incertainties in the deepest layers, it provides a more detailed description of the lateral variations in the shallow layers. Theoretical dispersion curves were also computed along the line with both and models. While the dispersion curves computed from models provide results consistent with the coherent maxima observed on dispersion images, dispersion curves computed from models are generally not fitting the observed propagation modes at low frequency. Surface-wave analysis could therefore improve models both in terms of reliability and ability to describe lateral variations. Finally, we were able to compute / sections from both and models. The two sections present similar features, but the section obtained from shows a higher lateral resolution and is consistent with the features observed on electrical resistivity tomography, thus validating our approach for retrieving Vp/Vs ratio from combined P-wave tomography and surface-wave profiling

show abstract

Seismic refraction methodology for groundwater level determination: “Water seismic index”

Cited by 71 publications

References 20 publications

Integrated geophysical profiles and H/V microtremor measurements for subsoil characterization

Integrated geophysical profiles and H/V microtremor measurements for subsoil characterization

Multiscale geophysical imaging of the critical zone

2D characterization of near‐surface : surface‐wave dispersion inversion versus refraction tomography

Contact Info

Product

Resources

About