作者: Andrea Bizzarri , Massimo Cocco
DOI: 10.4401/AG-3201
关键词: Curvature 、 Constitutive equation 、 Geology 、 Rake 、 Orientation (geometry) 、 Traction (engineering) 、 Stress (mechanics) 、 Law 、 Front velocity 、 Earthquake rupture
摘要: In this work we present a 3D Finite Difference numerical method to model the dynamic spontaneous propagation of an earthquake rupture on planar faults in elastic half-space. We implement Traction-at-Split-Nodes fault boundary condition for system of faults, either vertical or oblique, using different constitutive laws. We can adopt both slip-weakening law prescribe traction evolution within breakdown zone rate- and state-dependent friction laws, which involve choice relation state variable. Our numerical procedure allows use oblique and heterogeneous distribution initial stress rake rotation. This implies that two components slip velocity total are coupled together to satisfy, norm, adopted law. The simulations presented study show rupture acceleration super-shear crack speeds occurs along direction imposed stress; front velocity perpendicular is slower than pre-stress direction. Depending the position fault plane orientation instantaneous can change with time respect to These temporal rake rotations depend amplitude initial stress its plane. They also curvature rupture front respect direction: explains why mostly located near the front cohesive zone.