GCRAS    

Vestnik Otdelenia nauk o Zemle RAN, VOL. 5, NZ6001, doi:10.2205/2013NZ000118, 2012

Geodynamic models of deep structure of regions of natural hazards of the Eurasia – Pacific transition zone

Rodnikov, A. G., L. P. Zabarinskaya, N. A. Sergeeva, M. V. Nisilevich

Geophysical Center RAS, Moscow, Russia


Abstract

Geodynamic models of deep structure of active continental parts of the transition zone between the Eurasian continent and the Pacific Ocean (regions of the seas of Okhotsk, Japan, Philippine and South China) were constructed. The authors studied the deep-Earth structure in zones of seismic risk and volcanic zones, established the role of deep crustal processes of the mantle, in formation of the Earth's crustal structures, revealed the correlation between geological structures, tectonic-magmatic activity and the upper mantle's structure and detected the zones of high seismic risk. A distinctive feature of deep structure of the Eurasia-Pacific transition zone is the distribution of the layer of asthenosphere in the upper mantle, from which diapirs of anomalous mantle spread, processes in which cause formation of structures of the Earth's crust. The scientists discovered that the asthonosphere increases under all deep-water basins of the transition zone. On the surface asthenospheric upheavals correspond to rift formations and outflows of tholeitic magmas. They are located in stretch zones and manifest themselves on the background of deceasing power of the lithosphere and high heat flow. At the level of asthenophere of approximately 10–20 km the lithosphere splits, inter-arc deflections are formed, followed by formation of rift structures along their axial lines with outflows of tholeitic basalts.

Received 28 February 2013; published 17 June 2013.


GCRAS
Citation: Rodnikov, A. G., L. P. Zabarinskaya, N. A. Sergeeva, M. V. Nisilevich (2013), Geodynamic models of deep structure of regions of natural hazards of the Eurasia – Pacific transition zone, Vestn. Otd. nauk Zemle, 5, NZ6001, doi:10.2205/2013NZ000118.

Copyright 2013 by the Geophysical Center RAS