3D Image of electrical resistivity from Airborne Electromag. Geophys.

3D Image of Electrical Resistivity from Airborne Electromagnetic Geophysics: An example of a 3D model for Great Sand Dunes National Park, San Luis Valley, Colorado, from an airborne electromagnetic survey. Electrical resistivity can be used as a proxy for interpreting the distribution of sand versus clay underneath the eolian sand sheet. The clay was deposited by Lake Alamosa, a long-lived lake that disappeared several hundred thousand years before the formation of the dunes.