Transient Electromagnetic Soundings Near Great Sand Dunes National Park and Preserve, San Luis Valley, Colorado (2006 Field Season)
Open-File Report
2009-1051
By: David V. Fitterman and Oderson A. de Souza Filho
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Abstract
Time-domain electromagnetic (TEM) soundings were made near Great Sand Dunes National Park and Preserve in the San Luis Valley of southern Colorado to obtain subsurface information of use to hydrologic modeling. Seventeen soundings were made to the east and north of the sand dunes. Using a small loop TEM system, maximum exploration depths of about 75 to 150 m were obtained. In general, layered earth interpretations of the data found that resistivity decreases with depth. Comparison of soundings with geologic logs from nearby wells found that zones logged as having increased clay content usually corresponded with a significant resistivity decrease in the TEM determined model. This result supports the use of TEM soundings to map the location of the top of the clay unit deposited at the bottom of the ancient Lake Alamosa that filled the San Luis Valley from Pliocene to middle Pleistocene time.
Suggested Citation
Fitterman, D.V., and de Souza Filho, O.A., 2009, Transient electromagnetic soundings near Great Sand Dunes National Park and Preserve, San Luis Valley, Colorado (2006 field season): U.S. Geological Survey Open-File Report 2009-1051, Report: vi, 55 p.; Downloads Directory, https://doi.org/10.3133/ofr20091051.
ISSN: 2331-1258 (online)
ISSN: 0196-1497 (print)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Transient electromagnetic soundings near Great Sand Dunes National Park and Preserve, San Luis Valley, Colorado (2006 field season) |
| Series title | Open-File Report |
| Series number | 2009-1051 |
| DOI | 10.3133/ofr20091051 |
| Year Published | 2009 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | U.S. Geological Survey |
| Description | Report: vi, 55 p.; Downloads Directory |
| Time Range Start | 2006-01-01 |
| Time Range End | 2006-12-31 |
| Country | United States |
| State | Colorado |
| Other Geospatial | San Luis Valley |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | Y |