Laboratory Velocity Measurements Used for Recovering Soil Distributions from Field Seismic Data

Berge, Patricia A.; Bertete‐Aguirre, Hugo

doi:10.4133/1.2922742

Cited by 3 publications

(2 citation statements)

References 8 publications

(20 reference statements)

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“…An example of such a material is a kitchen sponge. Unconsolidated sands and peats have near zero to negative Poisson's ratios as studies by AracneRuddle et al [1999], Berge and Bertete-Aguirre [1999], and Prasad et al [2004]. The array site is within the unconsolidated Eocene Memphis Sand formation and our low value of Poisson's ratio is consistent with these laboratory measurements.…”

Section: Discussionsupporting

confidence: 81%

Thunder‐induced ground motions: 2. Site characterization

Lin

Langston

2009

J. Geophys. Res.

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[1] Thunder-induced ground motion, near-surface refraction, and Rayleigh wave dispersion measurements were used to constrain near-surface velocity structure at an unconsolidated sediment site. We employed near-surface seismic refraction measurements to first define ranges for site structure parameters. Air-coupled and hammer-generated Rayleigh wave dispersion curves were used to further constrain the site structure by a grid search technique. The acoustic-to-seismic coupling is modeled as an incident plane P wave in a fluid half-space impinging into a solid layered half-space. We found that the infrasound-induced ground motions constrained substrate velocities and the average thickness and velocities of the near-surface layer. The addition of higher-frequency near-surface Rayleigh waves produced tighter constraints on the near-surface velocities. This suggests that natural or controlled airborne pressure sources can be used to investigate the near-surface site structures for earthquake shaking hazard studies.

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Section: Discussionsupporting

confidence: 81%

Thunder‐induced ground motions: 2. Site characterization

Lin

Langston

2009

J. Geophys. Res.

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“…Although knowing Vp and Vs is useful, they are functions of up to three individual soil properties, being potentially ambiguous indicators of lithology if analyzed individually (Berge & Bertete-Aguirre, 2000;Kearey et al, 2009). The Poisson ratio, however, is independent of density and may be a more diagnostic geotechnical D r a f t which can be obtained in terms of the seismic velocities, as:…”

Section: Elastic Propertiesmentioning

confidence: 99%

Analysis of Seismic Refraction and Surface Wave Data for the Evaluation of Layers and Saturation of Solid Waste from a Landfill in Brasília, Brazil

Lima¹,

Guedes²,

Borges³

et al. 2022

Braz J Geophys

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The present work discusses the characterization of landfilled solid waste and saturated zones from the response of P and S-waves velocities (Vp and Vs), Poisson ratio (υ), Young’s modulus (E) and shear modulus (), obtained from velocity models in an area located in the former Jockey Clube Controlled Landfill. The obtained Vp values ranged from 231 to 1,160 m/s, while Vs values range from 124 to 449 m/s. The calculated υ ranged from 0.11 to 0.4, while and E ranged from 15 to 319 kPa and from 42 to 901 kPa, respectively. The values of and E indicate that the landfilled material is poorly competent. The combined interpretation of Vp, Vs and elastic parameters allowed the definition of three main layers in the surveyed area and their respective distance from soil surface, defined as: 1) Civil construction residual material, of around 10 meters thick; 2) A solid waste layer, of around 18 meters thick, marked as a lower Vs and higher υ interval, possibly associated with saturated material; and 3) below the depth of 28 meters, we estimate the natural landfill terrain, composed by the oxisol.

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The effect of texture and porosity on seismic reflection amplitude in granular sediments: Theory and examples from a high‐resolution shallow seismic experiment

Bachrach

Mukerji

2004

GEOPHYSICS

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Sediment properties such as grain shape, sorting, porosity, and the effective stress applied on the grains affect the elastic behavior of granular aggregates and, with it, the propagation of seismic waves. Seismic reflections from boundaries within granular sedimentary packs such as sands carry information about variation in the sediment properties. In this paper we analyze elastic contact mechanics models of granular media to show that within mineralogically uniform, homogeneously saturated sediments, the reflection strength can be theoretically related to variations in texture and porosity. The theoretical formulation indicates that in dry, mineralogically uniform sediments, seismic reflection amplitude depends strongly on changes in textures (such as angularity or sorting). In saturated sediments at low confining pressures, the reflection amplitude is primarily related to changes in porosity. Shallow seismic field data are interpreted quantitatively within the context of the theory. The field seismic data and supportive evidence from a nearby well are consistent with our interpretation of reflections arising from changes in textural properties of the sediment above the water table. This analysis can be used to quantify texture and porosity changes within sedimentary packets from measurements of seismic reflection strength and, thus, spatially map sedimentary properties in aquifers.

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Laboratory Velocity Measurements Used for Recovering Soil Distributions from Field Seismic Data

Cited by 3 publications

References 8 publications

Thunder‐induced ground motions: 2. Site characterization

Thunder‐induced ground motions: 2. Site characterization

Analysis of Seismic Refraction and Surface Wave Data for the Evaluation of Layers and Saturation of Solid Waste from a Landfill in Brasília, Brazil

The effect of texture and porosity on seismic reflection amplitude in granular sediments: Theory and examples from a high‐resolution shallow seismic experiment

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