Multimedia Gallery
June 30, 2008
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
Close-up image of the tunnel roof showing a gVT measurement location.
Close-up image of the tunnel roof showing a gVT measurement location. The arrow is a vector perpendicular to a surface that marks a discontinuity between rock layers. The orientation of the arrow in space gives the azimuth and slope of the surface.
Credit: Jeramy Decker, Kiewit Corp
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
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