A HYDROISOSTASY IMPACT TO VERTICAL MOTION AND STRESS-STRAIN CONDITIONS OF THE EARTH CRUST AT THE FAR-FIELD ZONES FROM GLOBAL GLACIATION CENTERS OF PLEISTOCENE

Abstract

Structure and function of the coastal area geosystems summed up from interaction exogenous and endogenous factors during they evolution which able dramatically influence as on environmental situation and economical activity. Hydroisostasy fenomena, as one of an agent at the connection of sea level changes under Glaciation – Postglacial Ice melting and called by this subsequent changes of stress-strain condition of deep Earth was not involved in sufficient degree at the Russian coastal areas for science investigation activity. In this study made an attempt of analysis of results of palaegeographic researches and digital simulations for observation of coastal areas of Russians marine areas located in far-field zones to estimate hydroisostasy contribution to vertical neotectonic motions.There are demonstrated, that disturbance of isostatic balance as results of load change to the sea bottom by 120 meters water’s column during several thousands years able change dominated tectonic trend; the deformations could achieve to lower mantle’s layer; the rebound time of deformated coastal lines after load-unload by sea level changes during GlaciationPostlacial periods may require more time than time required for melting cover Glaciers; confirmed influence of costal line’s geometry to sea level altitudes. Considered the piculiarities of hydroisostsy manifistations depend on shelves width and depend of depth of Moho boundary. In the zone of tectonically active continental margins, a conclusion is made about the predominance of the subduction mechanism in neotectonic trends over the contribution of hydroisostasis. Investigated hydroisostasy influence on stressstrain condition of Earth crust complicated by regional scale fault zone.