GEOPHYSICAL INVESTIGATIONS IN THE UPPER SAN PEDRO RIVER BASIN, BENSON, ARIZONA
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GEN-GEOS_416-516_2006_Report-U ...
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LASI Report
Author
Aspiras, Gerald P.Crawford, Matthew T.
Cylwik, Scott D.
Dangi, Tarun
Dewan, Milan M.
Hays, Naydene R.
Miller, Thomas E.
Sternberg, Ben K.
Thompson, Mayo
Affiliation
University of ArizonaIssue Date
2006-05-07
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Geophysics Field Camp 2006Rights
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
Four geophysical surveys were conducted at the Nature Conservancy about 20 miles north of Benson, AZ, in the Upper San Pedro River Basin, in order to better understand the nature of the sub-surface features of the basin. The geophysical methods included TEM (Transient Electromagnetic), seismic, EM34 and magnetic surveys. The TEM, seismic and magnetic surveys were conducted perpendicular to the river basin while the EM34 lines followed the riverbed. The perpendicular surveys were divided into two regions, referred to as the South and North Lines. The TEM, seismic, and magnetic surveys revealed a consolidated bedrock structure at shallow depths (30-40 m) along the South Line. The feature has an east-west extension of approximately 500 meters, and is located just east of the San Pedro River. None of the perpendicular surveys were able to detect bedrock features along the North Line, implying that the depth to bedrock exceeds the maximum depth of this investigation (360 m). Both lines showed regions of high porosity, and, potentially, of saturated materials. These regions were more prevalent along the North Line, where numerous highly porous areas were detected at various depths (including one region beginning at a depth of 50 meters and extending at least to 360 m). The EM34 failed to detect any appreciable long-wavelength changes in conductivity along the riverbed, though localized point anomalies were found.Series/Report no.
LASI-06-1Type
Booktext