RESULTS AND LIMITATIONS OF MAGNETOTELLURIC SURVEYS IN SIMPLE GEOLOGIC SITUATIONS

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Abstract
Results are presented of magnetotelluric measurements near a fault and on deep horizontal sediments. These are compared with known geological and geophysical data from the same localities, and are found to be in fair agreement with predictions from existing theories. Differences are attributed to shortcomings in measurement and analysis techniques, to geological complications, and partly to possible failings in the Cagniard and d’Erceville‐Kunetz theories. Evidence is discussed indicating substantial variation of Upper‐Mantle conductivity with location.

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