GEOPHYSICAL INVESTIGATION OF ROCK PROPERTIES NEAR SILVER CREEK, BOISE NATIONAL FOREST, IDAHO

During the summer of 1976, geophysical studies were undertaken near Silver Creek, which included seismic refraction and electrical resistivity studies to evaluate rock quality along a proposed U. S. Forest Service road route. The area is underlain by granitic rock of the Idaho Batholith. The major geologic problems are zones of extensive hydrothermal alteration. If the alternation zones and the country rock have a constant water saturation, then the alteration zones should have a lower seismic velocity and a lower electrical resistivity. Under these conditions, either technique should be definitive. However, under conditions of variable saturation, the saturation effects could be more significant than other parameters. By utilizing the two techniques together it is possible to separate saturation effects from alteration and weathering effects, and define rock properties such as to determine problem zones in the Silver Creek area.

Media Info

  • Features: References;
  • Pagination: p. 201-218

Subject/Index Terms

Filing Info

  • Accession Number: 00195956
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS, STATEDOT
  • Created Date: Aug 28 1979 12:00AM