بررسي جدايش فاز قطبش‌هاي گوناگون داده‌هاي زمين مگنتوتلوريك در محيط‌هاي ناهمسانگرد الكتريكي

Phase split investigation of different magnetotelluric data polarizations in electrically anisotropic media

Electrical anisotropy in the earth, the effect of current density dependency on the electric field orientation in a medium, has been considered significantly in recent Magnetotelluric (MT) observations. Several suggestions for electrical anisotropy are based upon MT observations of "phase splits", analogous to shear wave splits in seismology. The MT phase data is accentuated more than its amplitude responses since shallow small scale conductivity heterogeneities cause a significant distortion in MT amplitude responses (known as Galvanic Distortion), while MT phase responses remain immune. To investigate the MT phase response we will use the tensor representation of the MT phase introduced by Caldwell et al. (2004). This representation has the advantage of considerably simplifying the analysis of the Galvanic distortion effect. Moreover no assumption about the dimensionality of the underlying regional conductivity structure is essential. E-mail: mmontaha@ut.ac.ir :;t&;5:>