On interdependence between earthquakes and the Japan Sea section of the West-Pacific continent-ocean transitional zone

A distribution of earthquakes in the Japan Sea section of the West-Pacific continent-ocean transitional zone is to a great extent determined by the character of this territory deep structure. Generally, shallow-focus and intermediate-focus earthquakes are controlled by deep-water troughs and systems of faults, limiting the Japanese Island Arch. In the Japan Sea depression there locates the Northern deep-focal seism active area, characterized by linear gradients of gravitational field, Earth crust, the surface relief M and heat flow.