Estimation of crustal strength in Izu collision zone

概要

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We used 2D finite element method (FEM) to investigate the crustal strength of the Izu collision zone. Our model primarily based on the crustal structure given by Aoike et al. (2001). We set up standard rock layer properties for simulation. During simulation, cohesion was varied systematically. Simulation results show that failure zone decreases with increasing the convergent displacement in both cases i.e. before and after increasing cohesion. We used Mohr-Coulomb failure criterion and Mohr's circle to understand the reason. It is reasonable that rock layers do not break but flow below more than 30km depth. Further we compared simulated results with the focal mechanism data. Our models show only normal faulting which is not consistent with focal mechanism data. Thus our simulation models probably reveal the crustal strength of Izu collision zone.
琉球大学理学部の論文