CONTROLLED SOURCE AUDIO MAGNETO- TELLURIC (CSAMT) GEOPHYSICAL INVESTIGATION OF THE MIDDLE SAN PEDRO RIVER BASIN, SOUTHEASTERN ARIZONA
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GEN-GEOS_416-516_2008_Report-M ...
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LASI Report
Author
ANDERSON, KATHERINE E.EDGE, RUSSELL D.
HACKSTON, ABIGAIL J.
MARAJ, SHOBA
ROMANOWSKI, MICHAL J.
SEAMONS, REED L.
Sternberg, Ben K.
STOKES, PHILIP J.
THURNER, SALLY M.
Affiliation
University of ArizonaIssue Date
2008-05-14
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Geophysics Field Camp 2008Rights
Copyright © Arizona Board of RegentsCollection Information
The Geophysics Field Camp Reports are made available by the Laboratory for Advanced Subsurface Imaging (LASI) and the University of Arizona Libraries. Visit the LASI website for more information http://www.lasi.arizona.edu.Abstract
Groundwater resources are essential to support the growing population of Benson as well as the agriculture, and wildlife throughout the Middle San Pedro Basin. A refined model of the hydrogeologic framework within the region is necessary to allow for the most efficient allocation of the area’s ground water resources by city planners and water managers in charge of future development. New data were collected by the University of Arizona’s Geophysics Field Camp to update and improve this representation. This survey utilizes Controlled Source Audio Magnetotellurics (CSAMT) to characterize previously unstudied locations in the San Pedro Basin. CSAMT data were processed and interpreted using software from Zonge Engineering and Interpex Ltd. Seven receiver stations along a five-kilometer Middle San Pedro transect were used to determine the resistivities of several basin-fill units. Results show some resistivity variability with respect to depth among the sampled regions. In the simplest representation of the data, four layers were modeled. Resistivities ranged from 15-30 ohm-m in the near-surface units. Deeper units showed resistivities of 5-10 ohm-m. These results were plotted to help identify conductive aquitard (clay) and potentially more resistive aquifer units. This clay unit could correspond to a thin unit of the St. David Formation, which has previously been identified as a confining unit between two separate basin aquifers. CSAMT data indicate that the local bedrock is deeper than 500 m.Series/Report no.
LASI-08-1Type
Booktext