Self-potential (SP) is the method that everyone knows about but nobody seems to appreciate. Out of more than 850 papers published in the Symposium for the Application of Geophysics to Environmental and Engineering Problems (SAGEEP) between 1988 and 2001, 63 included SP as a key word, but most mentioned it only in passing.

This is surprising when you consider that SP is nonintrusive, fast, and inexpensive, requiring little more than a voltmeter and a few nonpolarizing electrodes, and that environmental geophysical surveys are typically low-budget operations. What is doubly surprising is that less than a handful of the 850 SAGEEP...

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