GPSアレイを利用した列島の応力増分分布や地域の構成則の推定について

概要

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A new inversion method of identifying stress is applied to the Japanese Islands to estimate regional stress distribution. This method finds a stress distribution from a strain distribution, by solving boundary value problems. Numerical simulation and model experiment verify the validity of the method. The deformation increment of Japan is measured by a global positioning system (GPS) network. We carry out the numerical computation of estimating regional stress increment distribution for the Japanese Islands, and obtain a self-equilibrating stress increment field. The regional constitutive relations are then estimated from the relation between the computed stress increment and the measured strain increment. Some discussions are made on the usefulness and limitation of the present inversion method.