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Proceedings Paper

Detection of fractures in Ash Meadows, southwestern Nevada, by electromagnetic terrain-conductivity measurements
Author(s): Charles A. Perry; Joseph Bagley Gillespie; Dirk A. Hargadine; E. D. Gutentag; Joseph S. Downey
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Paper 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.

Paper Details

Date Published: 31 August 1993
PDF: 12 pages
Proc. SPIE 1941, Ground Sensing, (31 August 1993); doi: 10.1117/12.154680
Show Author Affiliations
Charles A. Perry, U.S. Geological Survey (United States)
Joseph Bagley Gillespie, U.S. Geological Survey (United States)
Dirk A. Hargadine, U.S. Geological Survey (United States)
E. D. Gutentag, U.S. Geological Survey (United States)
Joseph S. Downey, U.S. Geological Survey (United States)

Published in SPIE Proceedings Vol. 1941:
Ground Sensing
Hatem N. Nasr, Editor(s)

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