Detection of fractures in Ash Meadows, southwestern Nevada, by electromagnetic terrain-conductivity measurements

Charles A. Perry; Joseph Bagley Gillespie; Dirk A. Hargadine; E. D. Gutentag; Joseph S. Downey

doi:10.1117/12.154680

31 August 1993 Detection of fractures in Ash Meadows, southwestern Nevada, by electromagnetic terrain-conductivity measurements

Charles A. Perry, Joseph Bagley Gillespie, Dirk A. Hargadine, E. D. Gutentag, Joseph S. Downey

Author Affiliations +

Proceedings Volume 1941, Ground Sensing; (1993) https://doi.org/10.1117/12.154680
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

Electromagnetic surveys using a terrain-conductivity measuring device have been used to detect individual fractures along a fault zone in a ground-water discharge area in Ash Meadows, southwestern Nevada. A fracture identified on aerial photographs and confirmed by excavation was surveyed using the conductivity meter to develop techniques in recognizing fractures. Precise coil alignment was critical in detecting the anomalies associated with the fracture. Rough desert terrain required modification of the conductivity meter, the addition of a unipod connected to the transmitter and receiver coils to enable quick, precise coil alignment. Generally, a decrease in the apparent conductivity readings in the vertical dipole configuration were observed when the transmitter coil passed over the fracture. In the horizontal dipole configuration, readings along the survey line at the different exploration depths tended to converge at the fracture, with the degree of convergence dependent upon overburden thickness.

Citation Download Citation

Charles A. Perry, Joseph Bagley Gillespie, Dirk A. Hargadine, E. D. Gutentag, and Joseph S. Downey "Detection of fractures in Ash Meadows, southwestern Nevada, by electromagnetic terrain-conductivity measurements", Proc. SPIE 1941, Ground Sensing, (31 August 1993); https://doi.org/10.1117/12.154680

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