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L10-page3 - • Wenner – a spacing • Schlumberger –...

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3 Vertical Electric Sounding When trying to probe how resistivity changes with depth, need multiple measurements that each give a different depth sensitivity. This is accomplished through resistivity sounding where greater electrode separation gives greater depth sensitivity. VES Data Plotting Convention Plot apparent resistivity as a function of the log of some measure of electrode separation.
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Unformatted text preview: • Wenner – a spacing • Schlumberger – AB/2 • Dipole-Dipole – n spacing • Asymptotes: • Short spacing << h 1 , ρ a = ρ 1 . • Long spacing >> total thickness of overlying layers, ρ a = ρ n • To get ρ a = ρ true for intermediate layers, layer must be thick relative to depth. Schlumberger ρ 2 > ρ 1 ρ 1 > ρ 2 ρ 2 > ρ 3 > ρ 1 ρ 3 > ρ 1 > ρ 2...
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