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Proceedings Paper

Imaging karstic structures with GPR along a motorway under construction
Author(s): Sophie Geraads; Gildas Omnes
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Paper Abstract

The construction of motorways generally involves the removal of the loose clayey surficial deposits thus creating adequate conditions for the illumination of structures several meters deeep within resistive bedrocks. The present paper describes the acquisition, processing interpretation and drilling results associated with the construction of a motorway intersecting karstic limestones in southwestern France. The processing sequence was similar to to sequences routinely applied to reflection seismic data from gain recovery to migration. In addition a Georadar Index section was derived from the envelope of the analytic signal after migration. Drilling on a vertical anomaly about 1.5 m high at a depth of 1,5 m confirmed the presence of a void between 1.5 m and 3.0 m. Many other structural details such as joints enlarged by karstification, layering, faults, can be seen on the sections.

Paper Details

Date Published: 12 April 2002
PDF: 5 pages
Proc. SPIE 4758, Ninth International Conference on Ground Penetrating Radar, (12 April 2002); doi: 10.1117/12.462224
Show Author Affiliations
Sophie Geraads, Citizen Technologies (France)
Gildas Omnes, Citizen Technologies (France)

Published in SPIE Proceedings Vol. 4758:
Ninth International Conference on Ground Penetrating Radar
Steven Koppenjan; Hua Lee, Editor(s)

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