Shatter belt, shatter zone[1] or crush zone[2] is a concept in geopolitics referring to strategically-positioned and -oriented regions on a political map that are deeply internally divided and encompassed in the competition between the great powers in geostrategic areas and spheres.[3]
The term was first applied in geopolitics in 1961 by Gordon East, an American scholar from Bloomington.[4] It was borrowed from geology, in which a shatter belt refers to a fault line, i.e. "belt of broken rock, produced by horizontal movement in a more or less vertical plane".[1]