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Book Chapter

Chapter 26: Composite Moveout Correction to a Shallow Mixed Reflection/Refraction GPR Phase

By
J. F. Hermance
J. F. Hermance
Brown University, Department of Geological Sciences, Environmental Geophysics/Hydrology Group, Providence, Rhode Island, U.S.A.
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R. W. Jacob
R. W. Jacob
Bucknell University, Lewisburg, Pennsylvania, U.S.A.
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R. N. Bohidar
R. N. Bohidar
Orissa Human Rights Commission, Orissa, India.
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Published:
January 01, 2010

Abstract

Adapting elements that are common to exploration seismology and electromagnetic wave propagation is extremely useful for interpreting ground-penetrating-radar (GPR) data in a variety of forms, whether the application is environmental, geotechnical, agricultural, or archaeological. In many regions of the world, subsurface conditions are such that material nearest the surface has a low GPR velocity and is underlain by material that has a higher GPR velocity. This condition leads to a critically refracted GPR phase from the higher-velocity interface at depth. Such refracted phases might be particularly troublesome when one is routinely interpreting conventional GPR profiling data as reflections, if in fact the critical distance for refractions is less than the fixed transmitter-receiver offset used for the profile. Misinterpreting such a phase might lead to a subtle, even significant error in depth estimates if only the standard normal-moveout (NMO) correction is applied. However, a complementary wide-angle common-midpoint (CMP) or common-shotpoint (CSP) “calibration” sounding allows identification of such a phase and application of a simple composite moveout correction. The procedure can be illustrated with data from a stratified glacial-drift site in southeastern New England.

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Contents

Geophysical Developments Series

Advances in Near-surface Seismology and Ground-penetrating Radar

Society of Exploration Geophysicists
Volume
15
ISBN electronic:
9781560802259
Publication date:
January 01, 2010

GeoRef

References

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