GEODYNAMIC MODEL OF THE INTERACTION OF THE SUBDUCTION ZONE WITH THE CONTINENTAL LITHOSPHERE IN THE AREA OF TRANSITION BETWEEN THE PACIFIC OCEAN AND EAST ASIA

• Published in: Geodynamics & Tectonophysics
• Main Authors: L. I. Lobkovsky, Y. V. Gabsatarov, D. A. Alekseev, I. S. Vladimirova, M. M. Ramazanov, V. D. Kotelkin, Л. И. Лобковский, Ю. В. Габсатаров, Д. А. Алексеев, И. С. Владимирова, М. М. Рамазанов, В. Д. Котелкин
• Other Authors: The study was conducted with the financial support of the Russian Science Foundation (project 20-17-00140)., Исследование выполнено при поддержке Российского научного фонда (проект № 20-17-00140).
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch 2022
• Subjects: численное моделирование; geodynamic process; largest earthquake; mantle convection; subduction zone; seismic cycle; recent earth’s surface displacements; satellite geodesy; numerical modeling; геодинамический процесс; сильнейшее землетрясение; мантийная конвекция; субдукционная зона; сейсмический цикл; современные движения земной поверхности; спутниковая геодезия; Arctic; Kamchatka
• Online Access: https://www.gt-crust.ru/jour/article/view/1586; https://doi.org/10.5800/GT-2022-13-5-0675

East Asia is the vast region of Asia which is characterized by a complex geological structure and high activity of seismic and tectonic processes. Satellite geodetic data, reflecting the recent crustal movements in the region, demonstrate a considerable variability in magnitude and direction of motions both along the strike of island-arc margins and deep into the continent. To explain the anomalies in the Earth's surface displacement field, the paper proposes a geodynamic model of East Asia which involves the mechanism of interaction between the continental lithosphere of the region and the continent-to-ocean transition area along the Kuril-Kamchatka and Japanese island arcs. The proposed concept includes the model of the upper-mantle convective cell, developing beneath the continental lithosphere, in combination with the keyboard-block model explaining the regularities of seismic cycle in the island-arc margins. It has been shown that the consideration of interaction between the lithosphere and upper mantle in the continent-to-ocean transition area in the framework of the model of non-stationary convective cell allows us to explain the recent crustal movements observed up to a distance of 2000 km and the seismic tomography data without involving additional lithospheric blocks. The model contributes to the development of the physically grounded geodynamic approach to the analysis of recent tectonics and eliminates the inconsistencies between the observed data and classical plate tectonics in East Asia. Регион Восточной Азии характеризуется сложным геологическим строением и высокой сейсмической и тектонической активностью. Данные спутниковой геодезии, отражающие современные движения земной поверхности региона, демонстрируют существенную изменчивость по величине и направлению как вдоль простирания островодужных окраин, так и в глубь континента. В работе для объяснения аномалий поля смещений земной поверхности предлагается геодинамическая модель Восточной Азии, учитывающая механизм взаимодействия континентальной ...