Audiomagnetotelluric sounding as a reconnaisance exploration technique in Long Valley, California
An audiomagnetotelluric (AMT) sounding system developed by the U. S. Geological Survey appears to be an effective technique for reconnaissance exploration to detect shallow resistivity anomalies associated with geothermal reservoirs. The equipment operates within the frequency range of 8-18,600 Hz by using nine logarithmically spaced narrow band filters. The technique has been evaluated in Long Valley, California, where the results from dc resistivity and time domain electromagnetic surveys were available for control. The AMT method outlines two linear zones of low resistivity that correlate well with known hot springs in the area. Generally, good agreement was obtained with the results of other electrical methods.
- Research Organization:
- Geological Survey, Denver
- OSTI ID:
- 7365728
- Journal Information:
- J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 81:5; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
150301* -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
CALIFORNIA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
EXPLORATION
GEOPHYSICAL SURVEYS
GEOTHERMAL EXPLORATION
LONG VALLEY
MAGNETOTELLURIC SURVEYS
MEASURING INSTRUMENTS
NORTH AMERICA
PHYSICAL PROPERTIES
USA
WESTERN REGION