HR: 0800h
AN: T11D-1290    [Abstracts]
TI: 3-D Discrete Element Simulation of Strike Slip Faulting
AU: * Saomoto, H
EM: h-saomoto@aist.go.jp
AF: Active Fault Research Center National Institute of Advanced Industrial Science and Technology, Site 7,1-1-1 Higashi, Tsukuba, 305-8567 Japan
AU: Yoshimi, M
EM: yoshimi.m@aist.go.jp
AF: Active Fault Research Center National Institute of Advanced Industrial Science and Technology, Site 7,1-1-1 Higashi, Tsukuba, 305-8567 Japan
AU: Kunimatsu, S
EM: s.kunimatsu@aist.go.jp
AF: Active Fault Research Center National Institute of Advanced Industrial Science and Technology, Site 7,1-1-1 Higashi, Tsukuba, 305-8567 Japan
AB: Recent progress of the X-ray Computed Tomography(X-rayCT) enables us to observe not only the surface but also the inside of geomaterials with a certain level of resolution. X-rayCT was employed in a series of experiments on sand box to visualize the faulting mechanism. A three-dimensional discrete element simulation was performed in order to figure out not only the strain distribution but also the stress distribution during the process of strike slip faulting. In this simulation, a rectangular sand box made of a rigid basement and rigid lateral walls is modeled with 129300 particles. The Discrete Element Method(DEM), widely used in the field of soil mechanics, is a numerical simulation technique that solves an assembly of frictional granular bodies by means of pursuing a behavior of interacting particle governed by Newton's laws of motion. The strike slip faulting analysis successfully simulated the sequential Reidel shear development from basement and computed the stress distribution produced by shearing. A zone of intensive shear stress developed adjacent to the Reidel shear plane joint at the pre-peak stage of boundary shear stress time history. After the peak stage of boundary shear stress, the shapes of histogram of the second stress invariant kept almost unchanged, then the boundary shear stress reached the residual strength and a lumped shear band appeared near the center of the model.
UR: http://unit.aist.go.jp/actfault/english/activef.html
DE: 7221 Paleoseismology
DE: 7223 Seismic hazard assessment and prediction
DE: 7230 Seismicity and seismotectonics
DE: 8107 Continental neotectonics
DE: 1200 GEODESY AND GRAVITY
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting