| Title | Megasource Electromagnetic Survey in the Bruneau-Grandview Area, Idaho |
|---|---|
| Authors | Keller, George V.; Jacobson, Jimmy J. |
| Year | 1983 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Exploration; USA; Idaho; Mountain Home; Bruneau; Grandview; Lower Snake River Plain; Miocene Basalt; Rhyolite; Magnetotelluric Survey; Square Wave Current; Cryogenic; Digited Recording; Transient Voltage; Horizontal Layers; Resistivity Profile; Geophysics |
| Abstract | In August, 1981, a large scale electromagnetic sounding survey was carried out in the vicinity of the Bruneau Grandview Known Geothermal Resource Area of the Snake River Plain in Idaho to provide information on rock properties to depths at which geothermal reservoir might exist. In the area of the survey, the section to a depth of about one kilometer has a resistivity of approximately 3 ohm meters, a value characteristic of lake bed sediments or pyroclastics. This is underlain in turn by a section of about five kilometers thickness, with a resistivity of 30 to 70 ohm metes, which may be primarily volcanic in nature. High resistivities which may represent the presence of crystalline rocks of the basement complex, exist at depths below about 6 kilometers. |