Polarimetric borehole radar application for characterizing subsurface structure

Motoyuki Sato, Tomohiro Abe, Hui Zhou, Jung Woong Ra

Research output: Contribution to journalArticlepeer-review

Abstract

Polarimetric borehole radar experiment was carried out in 2000 in Korea. Two boreholes separated by 20 m were used. The host rock is granite. The cavity is located at about 80 m depth. Single-hole and cross-hole radar profiles were acquired. We could clearly detect a subsurface cavity filled with air in the raw data. They have shown that cross-hole signal shows "double-dip" attenuation caused by scattering from an air-filled cavity. Although it is a simple technique, we found that it is suitable for detection of subsurface anomaly. Then we checked the attenuation between two boreholes, and showed that we can detect anomalous zone by a ray-based technique. In order to have vertical 2-D image between the boreholes, we developed a reverse time migration technique. In this analysis, we could assume two horizontal layers having different velocities, and we could image the cavity. The location of the cavity could clearly be determined by these signal interpretation.

Original languageEnglish
Pages (from-to)330-335
Number of pages6
JournalProceedings of SPIE-The International Society for Optical Engineering
Volume4758
DOIs
Publication statusPublished - 2002 Jan 1

Keywords

  • Borehole radar
  • Migration
  • Radar polarimetry
  • Subsurface imaging
  • Tunnel detection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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