Inversion of magnetotelluric data in the presence of strong bathymetry/topography
Shenghui Li, John R. Booker and Claudia Aprea
Journal name: Geophysical Prospecting
Issue: Vol 56, No 2, March 2008 pp. 259 - 268
Info: Article, PDF ( 523.66Kb )
We describe an algorithm for inverting magnetotelluric (MT) data in the presence of strong bathymetry or topography. Instead of correcting distortions due to bathymetry or topography we incorporate them directly into the inversion. To achieve a high accuracy in computing MT responses we use finite-difference approximations that permit sloping discrete boundaries inside model elements. The same approach is applicable to any seafloor electromagnetic calculation and can also be used to incorporate steep topography on land. We test our approach on various topographic features and compare our results to that of a finite element approach. Finally, we present inversion examples that illustrate the effectiveness of our inversion algorithm in recovering true subsurface structures in the presence of strong bathymetry and topography.