Abstract
To reliably predict surface rupture around the active fault, we need to compile much knowledge such as fault plane shape, subsurface structure, regional stress field, geo-material properties, and the scaling law represented by Matsuda's equation. This paper presents a basic scheme to incorporate those knowledge into the finite element analysis, especially focusing on the treatment of Matsuda's equation. After the scheme introduction, I performed a case study of displacement assessment on the Uemachi fault system in the Osaka basin and then compared the simulated displacement with that obtained from borehole drilling survey. This comparison showed that the simulated displacement (1.51 m) was almost in good agreement with the field survey result (1.6 m – 2.4 m). In addition, the simulation revealed the severe regional stress condition having ESE-WNW orientation of compressional axis which maximizes the displacement on most fault planes in and around the Osaka basin. Also, the simulation disclosed the interaction effect between the Uemachi fault segments and other fault planes. These results provide new insight in terms of the robust design of infrastructures upon surface rupture assessment.
