Genesis of Okinawa Trough and thrust development within accretionary prism by means of 2D finite element method

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The Okinawa Trough is a back-arc basin opened by crustal extension within the Eurasia plate. Several two-dimensional (2D) finite element models are presented to simulate the stress field and fault development in the upper continental lithosphere of the Eurasia plate. Linear elastic rheology with failure criterion under plane strain condition is adopted. Two types of displacement boundary condition are considered in the numerical model. The spreading displacement is applied along the crustal bottom beneath the Okinawa Trough. The convergence displacement is subjected along the upper side of the Philippine Sea (PHS) plate. From the simulated results, the spreading displacement along the crustal bottom generates normal faults in the trough, which finally leads to the formation of the Okinawa Trough. The subduction of the PHS plate causes the thrust development within the accretionary prism of the Eurasia plate. The results from our numerical experiment are in agreement with the earthquake focal mechanism in the study area.

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  • 構造地質

    構造地質 (45), 47-64, 2001-06

    構造地質研究会

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