Skip to Main Content
Book Chapter

Target-oriented interferometric tomography for GPR data

By
Sherif M. Hanafy
Sherif M. Hanafy
Cairo University, Department of Geophysics, Faculty of Science, Cairo, Egypt. E-mail: sh3m3@yahoo.com.
Search for other works by this author on:
Gerard T. Schuster
Gerard T. Schuster
Cairo University, Department of Geophysics, Faculty of Science, Cairo, Egypt. E-mail: sh3m3@yahoo.com.
Search for other works by this author on:
Published:
January 01, 2008

Abstract

An interferometric form of Fermat’s principle and travel- time tomography is used to invert ground-penetrating radar (GPR) data for the subsurface velocity distribution. The input data consist of GPR traveltimes of reflections from two bur’ied interfaces, A (reference) and B (target), where the data are excited and recorded by GPR antennas at the surface. Fer- mat’s interferometric principle is then used to redatum the surface transmitters and receivers to interface A so the associ’ated reflection traveltimes correspond to localized transit times between interfaces A and B. The overburden velocity model above interface A is not required. The result after to- mographic inversion is a high-resolution estimate of the ve’locity between interfaces A and B that does not depend on the velocity model above interface A. A motivation for introduc’ing interferometric traveltime tomography is that typical lay’er-stripping approaches will see the slowness error increase with depth as the layers are inverted. This suggests that near- surface statics errors are propagated and amplified with depth. In contrast, the interferometric traveltime tomography method largely eliminates statics errors by taking the differ’ence between reflection events that emanate from neighbor’ing layer interfaces. Slowness errors are not amplified with depth. However, the method is sensitive to the estimation ac’curacy for the geometry of the reference interface. Both syn’thetic and real field data are used successfully to validate the effectiveness of this interferometric technique.

You do not currently have access to this article.

Figures & Tables

Contents

Society of Exploration Geophysicists Geophysics Reprint Series

Seismic Interferometry: History and Present Status

Kees Wapenaar
Kees Wapenaar
Search for other works by this author on:
Deyan Draganov
Deyan Draganov
Search for other works by this author on:
Johan O.A. Robertsson
Johan O.A. Robertsson
Search for other works by this author on:
Society of Exploration Geophysicists
Volume
26
ISBN electronic:
9781560801924
Publication date:
January 01, 2008

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal