| Summary: | Transient electromagnetic sounding is successfully applied in mineral and
groundwater exploration. Major advantage of the transient sounding is to
overcome the effects of conductive overburden where frequency-domain
CFS frequently fails. Today time-domain EM sounding is also an important
exploration tool to determine the permafrost thickness and for oil exploration
in ice covered areas.
Fourier transform approach is used for computing the transient response
due to different electromagnetic sounding configurations over a multilayer
earth (Mallick and Verma, 1978; Patra and Mallick, 1980). Digital linear
filter approach is used by Patra and Shastri (1991) for computing transient
CFS response due to a two-layer earth. Verma (1977) and Verma and Mallick
(1979) have studied the phenomenon of detectability with different layered
earth models.
Studies are made on CFS transient response in terms of resolution
characteristics and performance of transient CFS over multilayer earth models.
H and K type three-layer and some four-layer earth models are considered
for transient response computation. Different loop radii are also chosen in
order to study any significant change in the resolution characteristics for
detecting deeper layers. Finally, the applicability of transient CFS over a
multilayer earth is briefly mentioned.
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