Attenuation and velocity characteristics of nano-to-micro scale magnetite mixtures - Implications for near-surface GPR

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Standard

Attenuation and velocity characteristics of nano-to-micro scale magnetite mixtures - Implications for near-surface GPR. / Cassidy, N. J.

Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists and Engineers, EAGE, 2007. (Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Harvard

Cassidy, NJ 2007, Attenuation and velocity characteristics of nano-to-micro scale magnetite mixtures - Implications for near-surface GPR. in Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics. Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics, European Association of Geoscientists and Engineers, EAGE, 13th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface 2007, Istanbul, Turkey, 3/09/07. https://doi.org/10.3997/2214-4609.20146576

APA

Cassidy, N. J. (2007). Attenuation and velocity characteristics of nano-to-micro scale magnetite mixtures - Implications for near-surface GPR. In Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics (Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics). European Association of Geoscientists and Engineers, EAGE. https://doi.org/10.3997/2214-4609.20146576

Vancouver

Cassidy NJ. Attenuation and velocity characteristics of nano-to-micro scale magnetite mixtures - Implications for near-surface GPR. In Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists and Engineers, EAGE. 2007. (Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics). https://doi.org/10.3997/2214-4609.20146576

Author

Cassidy, N. J. / Attenuation and velocity characteristics of nano-to-micro scale magnetite mixtures - Implications for near-surface GPR. Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists and Engineers, EAGE, 2007. (Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics).

Bibtex

@inproceedings{b5cf5a1165ec4fdcbdaf14a4e2dd7059,
title = "Attenuation and velocity characteristics of nano-to-micro scale magnetite mixtures - Implications for near-surface GPR",
abstract = "For many higher-frequency (500-2000MHz) near-surface ground-penetrating radar applications the magnetic properties of the subsurface are considered unimportant or negligible. However, if significant amounts of magnetically lossy minerals are present, such as magnetite, hematite, maghemite and/or iron in its free state, the influence of these individual components on the GPR signal attenuation or propagation velocity cannot be ignored. In an attempt to obtain an element of quantitative control on the attenuation/propagation characteristics of such materials, the results of a dielectric spectroscopy investigation into mixtures of quartz and micro-to-nano scale magnetite is presented where the relative attenuation enhancement (in decibels per metre - dB/m) and velocity retardation (in percent velocity difference) is given for a range of volume percent, 'generic' magnetite/quartz mixtures. The results indicate that even small amounts of magnetite can produce significant degrees of loss and velocity reduction and at the higher frequencies associated with near-surface GPR, any observed dispersion behaviour will be predominantly controlled by the magnetic loss characteristics rather than frequency-dependent variations in propagation velocity.",
author = "Cassidy, {N. J.}",
year = "2007",
doi = "10.3997/2214-4609.20146576",
language = "English",
isbn = "9073781817",
series = "Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics",
publisher = "European Association of Geoscientists and Engineers, EAGE",
booktitle = "Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics",
note = "13th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface 2007 ; Conference date: 03-09-2007 Through 05-09-2007",

}

RIS

TY - GEN

T1 - Attenuation and velocity characteristics of nano-to-micro scale magnetite mixtures - Implications for near-surface GPR

AU - Cassidy, N. J.

PY - 2007

Y1 - 2007

N2 - For many higher-frequency (500-2000MHz) near-surface ground-penetrating radar applications the magnetic properties of the subsurface are considered unimportant or negligible. However, if significant amounts of magnetically lossy minerals are present, such as magnetite, hematite, maghemite and/or iron in its free state, the influence of these individual components on the GPR signal attenuation or propagation velocity cannot be ignored. In an attempt to obtain an element of quantitative control on the attenuation/propagation characteristics of such materials, the results of a dielectric spectroscopy investigation into mixtures of quartz and micro-to-nano scale magnetite is presented where the relative attenuation enhancement (in decibels per metre - dB/m) and velocity retardation (in percent velocity difference) is given for a range of volume percent, 'generic' magnetite/quartz mixtures. The results indicate that even small amounts of magnetite can produce significant degrees of loss and velocity reduction and at the higher frequencies associated with near-surface GPR, any observed dispersion behaviour will be predominantly controlled by the magnetic loss characteristics rather than frequency-dependent variations in propagation velocity.

AB - For many higher-frequency (500-2000MHz) near-surface ground-penetrating radar applications the magnetic properties of the subsurface are considered unimportant or negligible. However, if significant amounts of magnetically lossy minerals are present, such as magnetite, hematite, maghemite and/or iron in its free state, the influence of these individual components on the GPR signal attenuation or propagation velocity cannot be ignored. In an attempt to obtain an element of quantitative control on the attenuation/propagation characteristics of such materials, the results of a dielectric spectroscopy investigation into mixtures of quartz and micro-to-nano scale magnetite is presented where the relative attenuation enhancement (in decibels per metre - dB/m) and velocity retardation (in percent velocity difference) is given for a range of volume percent, 'generic' magnetite/quartz mixtures. The results indicate that even small amounts of magnetite can produce significant degrees of loss and velocity reduction and at the higher frequencies associated with near-surface GPR, any observed dispersion behaviour will be predominantly controlled by the magnetic loss characteristics rather than frequency-dependent variations in propagation velocity.

UR - http://www.scopus.com/inward/record.url?scp=85086615095&partnerID=8YFLogxK

U2 - 10.3997/2214-4609.20146576

DO - 10.3997/2214-4609.20146576

M3 - Conference contribution

AN - SCOPUS:85086615095

SN - 9073781817

SN - 9789073781818

T3 - Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics

BT - Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics

PB - European Association of Geoscientists and Engineers, EAGE

T2 - 13th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface 2007

Y2 - 3 September 2007 through 5 September 2007

ER -