On resolution of the method of directional magnetotelluric soundings

The problem is to examine the resolution of directional magnetotelluric soundings (DMTS). Abrupt changes of impedances Z e, h of electrical and magnetic types in critical region of parameters R~0, J~ωµσ where R=Re[(K х) 2+(K у) 2], J=Im[(K х) 2+(K у) 2] are shown to result in significantly higher resolution of the method as compared with the traditional interpretation using Tikhonov-Cagniard impedance Z 0. The stability of solution of DMTS method inverse problem is considered subject to field measurement errors limited the resolution. The minimum of the limits is determined for the conductivity ∆σ/σ small variations. For studying DMTS resolution as applied to MT monitoring of earthquake site the mathematical experiment for three-layer geoelectric model was carried out. When changing the earthquake site conductivity of ∆σ~±10 % variations of reflection coefficient of electric mode ∆Q e are in the range of 20 % that is significantly more than the field measurement error. The possibility for prediction mode-ling in the context of obtained results is discussed.