Since the normal derivative of the telluric potential at the ground surface is zero, the odd terms in the Taylor expansion disappear, resulting in a simple technique of computing the downward continued potentials. The top of the nonconducting basement is a flow surface and can, therefore, be determined by sketching in curves orthogonal to the (continued) equipotential lines in suitably chosen sections. A model tank example is given. The applicability of the method of continuation to the interpretation of self potential data is also illustrated. A discussion of the derivatives, two limiting formulas, and a method for calculating telluric anomalies are included.

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