HR: 1340h
AN: G13A-0919    [Abstracts]
TI: The QuakeSim GeoFEST modeling system - new features inspired by San Andreas Fault motion
AU: * Norton, C D
EM: Charles.D.Norton@jpl.nasa.gov
AF: Jet Propulsion Laboratory / California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099, United States
AU: Parker, J W
EM: Jay.Parker@jpl.nasa.gov
AF: Jet Propulsion Laboratory / California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099, United States
AU: Lyzenga, G
EM: Gregory.Lyzenga@jpl.nasa.gov
AF: Jet Propulsion Laboratory / California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099, United States
AU: Lundgren, P
EM: Paul.Lundgren@jpl.nasa.gov
AF: Jet Propulsion Laboratory / California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099, United States
AU: Gable, C
EM: gable@lanl.gov
AF: Los Alamos National Laboratory, MS T003 LANL, Los Alamos, NM 87545, United States
AB: The NASA QuakeSim project modeling environment GeoFEST (Geophysical Finite Element Simulation Tool) has demonstrated features for rapidly scaling up to very large problems (of order 1e8 linear tetrahedral finite elements) by incorporating load-balanced parallel partitioning of the mesh, low-communication iterative solution of the sparse linear systems, and solution-driven strain energy based automatic parallel mesh refinement. Inspired by several San Andreas Fault modeling problems, new features have been added and are incorporated into a new public release. These include support for tectonic velocities at the boundaries within the adaptive mesh framework (giving support for repeat-event spinup), independent specified periodic motions on specified sets of fault nodes (supporting steady motion of faults at depth in same model with periodic crust events), buoyancy counterforces that arise from vertical deformation across density contrast surfaces. Support has been added for nonuniform slip along fault strike, as well as for nonplanar faults such as triangule faceted faults of the community fault model. This latter feature requires hand-crafting of the initial finite element mesh, using a meshing tool such as the Los Alamos Nationlal Laboratory's LaGriT package; GeoFEST support tools now translate LaGriT mesh information into the GeoFEST format. In addition we have implemented improvements to iterative convergence control and automatic refinement thresholds. These features are demonstrated by solutions obtained on geometric meshes over a range of simple to complex, including simple model comparisons to 2-D and analytic solutions for a repeat-event crustal fault overlaying a deep viscoelastic layer with steady dislocation applied (a simple model representing parts of the San Andreas fault system).
UR: http://quakesim.org
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
SC: Geodesy [G]
MN: 2007 Fall Meeting