Dual-Mode Mt Static Shift Correction Using In-Loop And Single-Loop Tem Data

Accurate removal of static shifts caused by nearsurface<br>heterogeneities in dual-mode magnetotelluric (MT) apparent resistivity<br>sounding curves in complex geological terrains is<br>an outstanding problem in MT data analysis.<br>Using field examples, it is shown that the in-loop<br>and single-loop TEM curves vary in the same<br>manner as transverse electric and transverse<br>magnetic mode MT apparent resistivity curves<br>over 2D geological terrains. This suggests that<br>dual-mode TEM data can be used to effectively<br>remove static shift in MT sounding curves<br>leaving only those signatures due to<br>electromagnetic induction in larger local and<br>regional structures that may then be reliably<br>modelled using existing multi-dimensional<br>interpretation schemes.