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ViscoSim

ViscoSim. USGS, Menlo Park. Fred Pollitz. Representation of Fault Friction. Static frictional stress. Dynamic frictional stress. Arrest stress. Dynamic overshoot parameter:. D = ( s s - s a )/( s s - s d ). Stress reduction parameter: Ds = s s - s a.

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ViscoSim

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  1. ViscoSim USGS, Menlo Park Fred Pollitz

  2. Representation of Fault Friction Static frictional stress Dynamic frictional stress Arrest stress Dynamic overshoot parameter: D = (ss - sa)/(ss - sd) Stress reduction parameter: Ds = ss - sa

  3. Representation of Fault Friction

  4. Representation of Viscoelasticity h = 3 x1019Pa s h = 1019Pa s

  5. Approximations to Elastodynamics • Representation of inertia • None • Representation of rupture propagation • Cascade model

  6. Fault Interaction

  7. # Viscoelastic Greens functions = x 3721 [map points] X 16 [source depths] X 16 [obs. depths] x 11 [sample times] x 6 [stress tensor components] =6x 107

  8. Twenty consecutive M>6.7 ruptures M6.9

  9. M7.2

  10. M7.0

  11. M7.6

  12. M6.7

  13. M7.5

  14. M7.6

  15. M7.2

  16. M6.7

  17. M6.7

  18. M7.7

  19. M7.3

  20. M7.5

  21. M7.3

  22. M7.3

  23. M7.2

  24. M6.7

  25. M7.2

  26. M7.3

  27. M7.5

  28. Simulator parameters Dynamic overshoot parameter: D = (ss - sa)/(ss - sd) Stress reduction parameter: Ds = ss - sa Shape of slip-weakening curve Mantle viscosity hm

  29. Results with ViscoSim • Fault system behavior is sensitive to simple parameters • Simulations capture Gutenberg-Richter and characteristic-earthquake behavior • Characteristic magnitude and mean recurrence interval may exhibit a systematic dependence on mantle viscosity

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