College of Geo-exploration Science and Technology;
Jilin University;
Changchun 130026;
China;
Department of Earth Sciences;
Memorial University of Newfoundland;
St.John's;
NL;
A1B;
Canada;
Magnetotelluric(MT); 3D; inversion; unstructured; fi; nite-element; method; quasi-Newton; method; L-BFGS;