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Book Chapter

Chapter 10: Permittivity Structure Derived from Group Velocities of Guided GPR Pulses

By
Matthew M. Haney
Matthew M. Haney
Boise State University, Department of Geosciences, Center for the Geophysical Investigation of the Shallow Subsurface, Boise, Idaho, U.S.A.
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Kathryn T. Decker
Kathryn T. Decker
Boise State University, Department of Geosciences, Center for the Geophysical Investigation of the Shallow Subsurface, Boise, Idaho, U.S.A.
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John H. Bradford
John H. Bradford
Boise State University, Department of Geosciences, Center for the Geophysical Investigation of the Shallow Subsurface, Boise, Idaho, U.S.A.
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Published:
January 01, 2010

Abstract

On a 2D profile of subsurface permittivity structure derived from guided GPR pulses recorded in the Kuparuk River watershed, Alaska, the transition from a stream channel to a peat layer is interpreted. Although multi-channel data are used, guided waves are analyzed using single-channel analysis, which sidesteps assumptions regarding lateral homogeneity within receiver arrays. As a result, 2D structure is obtained along a profile using an inversion procedure. These data were processed in three steps: (1) picking group traveltimes, (2) performing tomography in the lateral direction, and (3) inverting local group-velocity dispersion curves. When the permittivity profile obtained from the guided waves is compared to a GPR reflection profile, it is clear that the guided waves capture shallow structure near a stream channel that is not imaged accurately on the reflection profile. This demonstrates the utility of using guided waves to provide information on shallow structure that cannot be obtained from reflections.

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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

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