The authors have read Mr. Weaver's remarks with great interest. They would like to point out that their aim has not been to clear up the still debated question of how to define the primary field that generates the telluric currents, but to study the effect of a fault on a special type of field, complying with the laws of electromagnetism (neglecting the displacement currents, as is usual at the frequences considered) and differing little from actual telluric currents.

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