In electromagnetic EM sounding the depth of investigation with increasing frequency Gate Geology and Geophysics 2014

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In electromagnetic (EM) sounding, the depth of investigation ___________ with increasing frequency. (-Gate Geology and Geophysics 2014)

(A) increases 
(B) decreases 
(C) remains unchanged 
(D) varies randomly


By:Aparna-Dasgupta

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Answers

(B) decreases

The maximum depth of investigation is virtually unbounded because of high signal strengths at low frequencies. Transient electromagnetic (TEM) soundings, on the other hand, have a limited depth of penetration, but are less affected by static shift errors.

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