Accession Number : ADA112203

Title :   MX Siting Investigation Gravity Survey - Pahroc Valley, Nevada.

Descriptive Note : Final rept.


Report Date : 20 JUL 1981

Pagination or Media Count : 53

Abstract : Gravity data indicate that Pahroc Valley is an equidimensional alluvial basin which is approximately 1400 feet (427 m) deep at its northwestern end. The alluvium overlies a down-to-the-west tilted fault block and there is a broad, shallow pediment across the southern end of the valley. The calculated bedrock depths are necessarily approximate because the complex and imperfectly known density distribution has been represented by a simple two-density model. Also, the residual gravity anomaly is necessarily based on an interpreted regional field. An average density contrast of -0.50 g/cu cm between the alluvium and bed rock was used to calculate the thickness of the valley-fill material. Future studies that acquire better density data or measure actual depths to bed rock in deep parts of the valley can be used to refine the gravity interpretation. (Author)

Descriptors :   *Valleys, *Gravity, Nevada, Surveys, Gravimetry, Mapping, Contours, Geology

Subject Categories : Geodesy
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE