L10-page3 - Wenner a spacing Schlumberger AB/2...

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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 , a = 1 . Long spacing >> total thickness of overlying layers, a = n To get a = true for intermediate layers, layer must be thick relative to depth. Schlumberger 2 > 1 1 > 2 2 > 3 > 1 3 > 1 > 2...
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