Abstract
The characteristic of transient electrical field by an electrical dipole source on one-dimensional polarizable earth surface is basic knowledge for geophysicists to use electromagnetic method to explore the earth. This paper deals with involved mathematical model and numerical algorithm of the down-step transient response for the horizontal component of the electric field produced by an electric current dipole, and a series of transient response curves on some typical geoelectric section. After analyzing the computed results, some important information are provided for establishing a new branch of method which observes and utilizes induced polarization and electromagnetic effects simultaneously in time domain—time spectral resistivity.
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