Low Frequency Electromagnetic Prospecting System

A prototype portable electromagnetic sounding system was assembled and depth sounding survey was conducted in Grass Valley, Nevada, as a part of a program to evaluate geophysical techniques in geothermal exploration. A horizontal loop transmitter of radius 50 meters operating between .01 Hz and 100 Hz was used in conjunction with a SQUID magnetometer. A digital synchronous detector was used for on site processing of magnetometer output. This detector allowed useful data acquisition with transmitter-receiver separation of up to 2 km with power requirements of less than 72 watts. Conductive sediments (1 to 10 ohm-m) of thicknesses of up to 1.5 km were well resolved with this system, and the interpreted sections compared very well with dc resistivity measurements made with much heavier equipment and larger arrays in the same area.

Data and Resources

Metadata Source

Additional Info

Field Value
Citation Date 1978-04-01T00:00:00

Harvest Information

Original ID B5920131C9CF4B4CBDC97A3DAE35F879
Index Date 2016-03-17T20:52:07
Original Format ISO-USGIN
Original Version 1.2

Author

Name Jain, B.K.
Organization Geo-Heat Center, Oregon Institute of Technology, Klamath Falls, OR (USA)
Email geoheat@oit.edu

Geographic Extent

North Bound 42.002207
South Bound 35.001857
East Bound -120.0064729
West Bound -114.0396479