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Title: Cross-borehole seismic probing to locate high-contrast anomalies

Abstract

Seismic probing between boreholes is useful for locating high-contrast geophysical anomalies such as an abandoned tunnel. Theoretical studies of continuous-wave components of a swept-frequency or pulse seismic wave interaction with a tunnel show that both the signal minima and the phase structure of the received signal can be used for locating the anomaly. The theoretical studies show that as the source and receiver are lowered in separate boreholes straddling the anomaly, the signal minima and the phase structure can be easily interpreted to yield both the lateral and vertical positions of the anomaly. Plane waves of compressional, horizontally polarized shear, and vertically polarized shear wave types incident on a cylindrical horizontal anomaly have been considered. All components of the total seismic field have been calculated using an exact formulation. The variation of the response is studied as a function of the ratio of anomaly diameter to wavelength. The resulting fields in the receiver borehole are an effective diagnostic when a wavelength in the surrounding medium is less than or equal to the diameter of the anomaly. These results are analogous to the corresponding electromagnetic case which has been studied previously.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
5170983
Report Number(s):
UCID-19247
ON: DE82016038
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of document are illegible
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; SUBSURFACE STRUCTURES; SEISMIC SURVEYS; BOREHOLES; TUNNELS; CAVITIES; GEOPHYSICAL SURVEYS; SURVEYS; UNDERGROUND FACILITIES; 580203* - Geophysics- Geophysical Survey Methods- (1980-1989)

Citation Formats

Lytle, R J, and Portnoff, M R. Cross-borehole seismic probing to locate high-contrast anomalies. United States: N. p., 1982. Web.
Lytle, R J, & Portnoff, M R. Cross-borehole seismic probing to locate high-contrast anomalies. United States.
Lytle, R J, and Portnoff, M R. 1982. "Cross-borehole seismic probing to locate high-contrast anomalies". United States.
@article{osti_5170983,
title = {Cross-borehole seismic probing to locate high-contrast anomalies},
author = {Lytle, R J and Portnoff, M R},
abstractNote = {Seismic probing between boreholes is useful for locating high-contrast geophysical anomalies such as an abandoned tunnel. Theoretical studies of continuous-wave components of a swept-frequency or pulse seismic wave interaction with a tunnel show that both the signal minima and the phase structure of the received signal can be used for locating the anomaly. The theoretical studies show that as the source and receiver are lowered in separate boreholes straddling the anomaly, the signal minima and the phase structure can be easily interpreted to yield both the lateral and vertical positions of the anomaly. Plane waves of compressional, horizontally polarized shear, and vertically polarized shear wave types incident on a cylindrical horizontal anomaly have been considered. All components of the total seismic field have been calculated using an exact formulation. The variation of the response is studied as a function of the ratio of anomaly diameter to wavelength. The resulting fields in the receiver borehole are an effective diagnostic when a wavelength in the surrounding medium is less than or equal to the diameter of the anomaly. These results are analogous to the corresponding electromagnetic case which has been studied previously.},
doi = {},
url = {https://www.osti.gov/biblio/5170983}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Feb 19 00:00:00 EST 1982},
month = {Fri Feb 19 00:00:00 EST 1982}
}

Technical Report:
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