Geophysical research: article

Аnnotation: The results of three dimensional numerical modeling of Kamchatka magnetotelluric (MT) field are considered in the study of three dimensional coast effect. We used two models. The first one has conductivity rising with the depth, the second one includes conductive layer in the crust. We attempted to divide the coast effect into regional and local components and present the analysis of MT polar diagrams that characterize the medium dimensionality at the boundary between the Okhotsk Sea and Pacific Ocean and the distant coastline. Also we give detailed description of modelled amplitude and phase MT curves obtained in western, central, southern, and eastern Kamchatka areas. The behavior of these curves outlines peculiarities of regional and local coast effects. The periods of the coast effect manifestation are determined and possible reasons for its origin are discussed.