Abstract
By electromagnetic theory, for the case that the magnetic dipole source and the receiver are set in seawater, the general expressions of frequency-domain electromagnetic responses for a layered sea-floor model are deduced. From those, the transient response expressions of three common configurations–vertical magnetic dipole-dipole (HZHZ), central loop, and coincident loop, located on the surface of uniform half-space seafloor, are derived, respectively, supposing that seawater is uniform half space, or its depth is finite. These expressions connect transient response with oceanic parameters such as the conductivity of the seafloor, and provide theoretical foundation for forward modeling, and inversion and interpretation in sea-floor transient electromagnetic exploration. The modeling indicates that the presence of seawater not only changes the shape of transient response curve, but also reduces the resolution to sea-floor conductivity.
Published Version
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