Numerical and Theoretical Studies on the Mechanical Destabilization of Planes of Weakness, Dynamic Rupture Propagation and Wave Radiation

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In this research project, a theoretical study on the fracture mechanics of planes of weakness has been promoted. For example, the dynamic fracture propagation on a plane of weakness located between materials with extremely different physical properties has been considered in light of rupture propagation speed. The effect of waves, generated by fracture of planes of weakness, on the surrounding environment, the ground and structures has been quantitatively evaluated. As a concrete instance, the dynamic slope failure generated by the 1978 Miyagi-ken-oki, Japan, earthquake in the residential area of Sendai City has been studied. It has been pointed out that such slope failure may be possibly induced not only by the universal mechanical characteristics of seismic waves but also by the local seismological (tectonic) conditions under the Tohoku region of Japan.