Low frequency electromagnetic prospecting system. [Grass Valley, KGRA]
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.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6771904
- Report Number(s):
- LBL-7042
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:5139469
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Related Subjects
15 GEOTHERMAL ENERGY
150301* -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
ANTENNAS
DATA ACQUISITION SYSTEMS
DATA PROCESSING
DESIGN
DIAGRAMS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPLORATION
FLUXMETERS
GEOPHYSICAL SURVEYS
GEOTHERMAL EXPLORATION
Geothermal Legacy
IMAGES
INFORMATION
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NEVADA
NORTH AMERICA
POWER SUPPLIES
PROCESSING
PULSES
SIGNALS
SQUID DEVICES
SUPERCONDUCTING DEVICES
TABLES
USA
WESTERN REGION
150301* -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
ANTENNAS
DATA ACQUISITION SYSTEMS
DATA PROCESSING
DESIGN
DIAGRAMS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPLORATION
FLUXMETERS
GEOPHYSICAL SURVEYS
GEOTHERMAL EXPLORATION
Geothermal Legacy
IMAGES
INFORMATION
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NEVADA
NORTH AMERICA
POWER SUPPLIES
PROCESSING
PULSES
SIGNALS
SQUID DEVICES
SUPERCONDUCTING DEVICES
TABLES
USA
WESTERN REGION