Study Of Magnetotelluric Sounding "Standard Site" Muti-method Inversion

This thesis depends on the project"Standard Continental Geo-Electromagnetic Net Experimentation". Modeling the field work of standard site measurements, some theoretical models are discussed, used the most effective 1D, 2D, and 3D inversion methods. It also gives several suggestions on how to inverse in the standard site and the area nearby, more accurately and reliably.Firstly, a simple cube model and a complex model consisted with two cubes beneath overburden are calculated by the 3D forward modules of three kind of software, which is WSINV3DMT, WinGLink, and INTEM3D. These software are all based on finite difference equations and integral equations. By comparing the results, we draw a conclusion that when the forward data is large and models are complex, it is preferable to use the result generated by WinGLink. Regardless of regional structural trend, standard sites are measured regularly, as planned in MT observation network, which is different with traditional ways. Therefore, we did some research on how the effects of geologic subsurface, frequencies number and site space varies the inversion result and find ways to reduce it. In the last part, several theoretical models are designed, and processed with kinds of inversion methods. Analyzing three typical model such as cube-aside model, orthogonal-board model, and un-orthogonal-board model, we give some suggestions on how to raise the accuracy and reliability of inversions, by synthetically using 1D, 2D and 3D inversion methods. Further, we gives the standard site 10840 as an inversion example.