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ViscoSim

This document discusses the representation of fault friction and viscoelasticity in the context of earthquake modeling using ViscoSim. Key parameters such as static and dynamic frictional stress and the dynamic overshoot parameter are outlined. It emphasizes the sensitivity of fault system behavior to simple parameters and reveals insights from simulations that capture Gutenberg-Richter distributions and characteristic earthquake behavior. The study highlights the impact of mantle viscosity on characteristic magnitudes and mean recurrence intervals, showcasing how these factors interact in seismic events.

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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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