Journal ArticleDOI
Seismic velocities and Poisson's ratio of shallow unconsolidated sands
TLDR
In this paper, the authors determined P- and S-wave velocity depth profiles in shallow, unconsolidated beach sand by analyzing three-component surface seismic data and attributed this discrepancy to the angularity of the sand grains.Abstract:
We determined P- and S-wave velocity depth profiles in shallow, unconsolidated beach sand by analyzing three-component surface seismic data. P- and S-wave velocity profiles were calculated from traveltime measurements of vertical and tangential component seismograms, respectively. The results reveal two discrepancies between theory and data. Whereas both velocities were found to be proportional to the pressure raised to the power of 1/6, as predicted by the Hertz-Mindlin contact theory, the actual values of the velocities are less than half of those calculated from this theory. We attribute this discrepancy to the angularity of the sand grains. Assuming that the average radii of curvature at the grain contacts are smaller than the average radii of the grains, we modify the Hertz-Mindlin theory accordingly. We found that the ratio of the contact radius to the grain radius is about 0.086. The second disparity is between the observed Poisson’s ratio of 0.15 and the theoretical value (0.008 for random pack of quartz spheres). This discrepancy can be reconciled by assuming slip at the grain contacts. Because slip decreases the shearing between grains, Poisson’s ratio increases.read more
Citations
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Journal ArticleDOI
Surface-wave inversion using a direct search algorithm and its application to ambient vibration measurements
TL;DR: In this paper, a tool using the neighbourhood algorithm was developed to invert the one-dimensional V s profile from passive or active source experiments, with and without a priori information.
Journal ArticleDOI
Dynamics of wet granular matter
TL;DR: In this paper, it is demonstrated that although wet granular systems are quite complex, their main features may be understood on the basis of rather simple concepts, such as statistical concepts, dynamics, and phase transitions.
Journal ArticleDOI
Influence of gas hydrate morphology on the seismic velocities of sands
TL;DR: In this paper, the results of a series of resonant column tests on specimens where gas hydrate has been formed in sands using an "excess water" technique are reported.
Journal ArticleDOI
Geophysical constraints on deep weathering and water storage potential in the Southern Sierra Critical Zone Observatory
W. Steven Holbrook,Clifford S. Riebe,Mehrez Elwaseif,J. L. Hayes,Kyle Basler-Reeder,Dennis L. Harry,Armen Malazian,Anthony Dosseto,P. C. Hartsough,Jan W. Hopmans +9 more
TL;DR: In this article, the authors used seismic refraction and resistivity imaging techniques to estimate variations in regolith thickness and porosity across a forested slope and swampy meadow in the Southern Sierra Critical Zone Observatory (SSCZO).
Journal ArticleDOI
Estimating the hydraulic conductivity at the South Oyster Site from geophysical tomographic data using Bayesian techniques based on the normal linear regression model
TL;DR: In this paper, the authors explored the use of ground penetrating radar (GPR) tomographic velocity, GPR tomographic attenuation, and seismic tomographic velocities for hydraulic conductivity estimation at the South Oyster Site, using a Bayesian framework.
References
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Journal ArticleDOI
A variational approach to the theory of the elastic behaviour of multiphase materials
Zvi Hashin,S. Shtrikman +1 more
TL;DR: In this paper, the authors derived upper and lower bounds for the effective elastic moduli of quasi-isotropic and quasi-homogeneous multiphase materials of arbitrary phase geometry.
Journal ArticleDOI
Compliance of elastic bodies in contact
The Rock Physics Handbook: Tools for seismic analysis of porous media second edition
TL;DR: In this paper, the authors menyaring sejumlah besar teori latar belakang and hasil laboratorium menjadi serangkaian bab ringkas ying memberikan solusi praktis untuk masalah dalam interpretasi data geofisika.
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The Rock Physics Handbook: Tools for Seismic Analysis of Porous Media
TL;DR: In this article, the authors present basic tools for elasticity and Hooke's law, effective media, granular media, flow and diffusion, and fluid effects on wave propagation for wave propagation.
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Principles of Sedimentology and Stratigraphy
TL;DR: In this article, the authors discuss the transport and deposition of Siliciclastic Sediment and its relationship with other Chemical/Biochemical and Carbonaceous Sedimentary Rocks, as well as their relationship with geologic time.
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