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Cordilleran Section - 98th Annual Meeting (May 13–15, 2002)

Paper No. 0
Presentation Time: 1:30 PM-5:30 PM

ELECTRICAL CONDUCTIVITY IMAGING OF AQUIFERS IN THE ILLINOIS VALLEY, OREGON, U.S.A., USING NATURAL AND CONTROLLED SOURCE MAGNETOTELLURICS


CONTRERAS, Trevor A.1, WAFF, Harve S.2 and BARWATTA, Anthony2, (1)Department of Geological Sciences, Univ of Oregon, 110C Cascade Hall, Eugene, OR 97403, (2)Department of Geological Sciences, Univ of Oregon, Eugene, OR 97403, trevorc@darkwing.uoregon.edu

Natural source (MT) and controlled source audiomagnetotellurics (CSAMT) surveys have been conducted in the Illinois Valley, near Cave Junction, Oregon, USA. The primary objectives of the investigation were to characterize local aquifers, determine the thickness of alluvium and assist in the future sighting of high production irrigation wells. A total of 58 stations were occupied providing 3.25 km of nearly continuous resistivity-depth profiles. Combining information found in well logs and resistivity data indicated the locations of more resistive coarse grain alluvial aquifers with resistivity ranging from 25 to 100 ohm-m interlayered by less resistive clay rich alluvial layers (1-25 ohm-m). Alluvium thickness estimates range from 35 to >250m in area studied.

Session No. 48--Booth# 20

T21. Groundwater and Surface Water Hydrology (Posters)
Wednesday, 15 May 2002: 1:30 PM-5:30 PM
Geological Society of America Abstracts with Programs. Vol. 34, No. 5, April 2002, p.110
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