Abstract
Asthenosphere is regarded as a layer of partial melting, physical properties of which differ from those of the matter lying above and under it. As various physical properties react differently to one and the same percentage of the magmatic melt (some of them change by the first tens of percent, the others by some orders), we consider specifically geothermal, geoelectrical, seismic (wave guide) and density of asthenospheres of the Soviet Far East, Kuril-Kamchatka and Japanese Island arcs and the adjacent part of the Pacific Ocean. It is shown that the structure of each of the asthenospheres differs from the others. In conclusion a comprehensive model of the asthenosphere of the southern part of the Okhotsk Sea and Kuril Island arc is given.
