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western Trans-Baikal. Zones IV and V represent the folded systems of the southeast-
ern Trans-Baikal. Each zone contains about 8-10 short-period MT soundings and
1-3 long-period reference MT soundings. Within each zone, the apparent-resistivity
curves are similar in form but dramatically suffer from the static shift caused by
near-surface trappean intrusions. The distorted
A
-curves have been corrected by
averaging and synthesized by vertical translation (the average long-period
A
-curves
are vertically shifted to the average short-period
A
-curves). Given a representative
statistics of short-period magnetotelluric soundings, this noise abatement procedure
may combine separate fragments of MT soundings and construct continuous noise-
suppressed
A
-curves that cover the entire interval of periods - from a few seconds
to a few hours.
The synthesized average curves of apparent resistivity obtained in the various
zones are plotted in Fig. 12.32. We believe that the uncertainty for the synthe-
sized apparent resistivity does not exceed 10% at high frequencies and 20% at
Fig. 12.32
The synthesized apparent-resistivty curves in I, II, III, IV, V zones
