Deep Electromagnetic Soundings Northeast of The Geysers Steam Field
- Key words
- Exploration; USA; California; Lake; The Geysers; Batholith; Heat Flow; Gravity; Electromagnetic Sounding; Square Wave Current; Resistivity Depth Profile; Layering; Geophysics
- Location
- The Geysers, California
- Conference
- Geothermal Resources Council Transactions
- Year
- 1983
- Session
- Exploration; Geophysical surveys; Resistivity surveys
- Language
- English
Abstract
During the summer of 1981, a large scale electromagnetic sounding survey was carried out northeast of the Geysers steam field in northern California, along the north and south sides of Clear Lake. The field data were interpreted to determine the probable resistivity distribution to a depth of about 15 kilometers. The normal behavior of the resistivity vs. depth profile is that the resistivity decrease from values between 30 and 100 ohm-meters in the first kilometer of the subsurface to values as low as 3 to 5 ohm meters at depths that vary form a few kilometers to as great as 12 kilometers. The resistivity at greater depth is high. This type of resistivity depth profile does to support the concept of a partially molten batholith being present at these depths.
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