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Fact Sheet 2007-3011

In cooperation with the New Mexico Bureau of Geology and Mineral Resources

Time-Domain Electromagnetic Soundings to Characterize Water Quality Within a Freshwater/Saline-Water Transition Zone, Estancia Valley, New Mexico, July 2005—A Reconnaissance Study

By Sachin D. Shah1, Wade H. Kress1, and Lewis A. Land2

1 U.S. Geological Survey.
2 New Mexico Bureau of Geology and Mineral Resources.

Report cover and link to PDF

Fact Sheet PDF (1.09 MB)

During July 2005, the U.S. Geological Survey, in cooperation with the New Mexico Bureau of Geology and Mineral Resources, conducted a reconnaissance study in the Estancia Valley in central New Mexico to characterize water quality using time-domain electromagnetic (TDEM) surface-geophysical soundings. TDEM sounding is one of a number of surface geophysical methods that provide a relatively quick and inexpensive means to characterize subsurface geologic and hydrogeologic properties. TDEM surface geophysical methods can be used to detect variations in the electrical resistivity of the subsurface, which in turn can be related to variations in the physical and chemical properties of soil, rock, and pore fluids.

Suggested citation:

Shah, S.D., Kress, W.H., and Land, L.A., 2007, Time-domain electromagnetic soundings to characterize water quality within a freshwater/saline-water transition zone, Estancia Valley, New Mexico, July 2005—A reconnaissance study: U.S. Geological Survey Fact Sheet 2007–3011, 6 p.


Hydrogeologic Setting

How Time-Domain Electromagnetic Soundings Work

Data Acquisition

Data Processing

Inverse Modeling

Modeling Interpretation and Findings

References Cited

For additional information contact:
Director, Texas Water Science Center
U.S. Geological Survey
8027 Exchange Drive
Austin, Texas 78754-4733
World Wide Web:
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Last modified: Thursday, 31-May-2007 15:09:26 EDT