Skip to main content
USGS - science for a changing world


Transient electromagnetic (TEM) sounding data; San Luis Valley, Colorado, 2007


Publication Date
Start Date
End Date


Fitterman, D.V., 2016, Transient electromagnetic sounding data collected in the San Luis Valley, Colorado near the Great Sand Dunes National Park and Preserve and the Alamosa National Wildlife Refuge (field seasons 2007, 2009, and 2011): U.S. Geological Survey data release,


Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, and an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is in contrast to the higher [...]

Child Items (5)


Point of Contact :
V.J. (Tien) Grauch
Originator :
David V. Fitterman
Metadata Contact :
Michaela R Johnson
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase

Attached Files

Click on title to download individual files attached to this item.

GRSAND07.TX3 432.02 KB
TEM_plots_2007.pdf 7.33 MB
TEM_report_2007.pdf 210.98 KB
TEM_report_2007.txt 168.46 KB
Original FGDC Metadata

34.7 KB


Data were collected to map the location of clay units and investigate the presence of suspected faults in the San Luis Valley, Colorado.

Item Actions

View Item as ...

Save Item as ...

View Item...