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Thursday May 9 8:30 am-noon Working Group 4 Convenors: Olsen, Igel, Furumura

Thursday May 9 8:30 am-noon Working Group 4 Convenors: Olsen, Igel, Furumura Macro-scale Simulation Dynamic Rupture and Wave Propagation Innovations in Dynamic and Kinematic Modeling. Oral Presentations (WG 4): 8:30 am Introduction ( Olsen )

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Thursday May 9 8:30 am-noon Working Group 4 Convenors: Olsen, Igel, Furumura

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  1. Thursday May 9 8:30 am-noon Working Group 4 Convenors: Olsen, Igel, Furumura Macro-scale Simulation Dynamic Rupture and Wave Propagation Innovations in Dynamic and Kinematic Modeling

  2. Oral Presentations (WG 4): 8:30 am Introduction (Olsen) 8:35 am Earthquakes on Heterogeneous Faults (Harris) 8:50 am On the Estimation of Dynamic Rupture Parameters (Olsen) 9:10 am Seismic Energy Computed from Dynamic Models (Archuleta/Favreau) 9:30 am FE Simulations of Seismic Wave Propagation with a Voxel Grid (Koketsu/Ikegami) 9:45 am The Deformations and Fractures for Granite Block of Y-Mode With En Echelon Fault During Biaxial Compression (Xu/Yang/Zhao/Chen) 10:00 am Break 10:20 am Guided Waves from Sources Outside Faults: An Indication for Shallow Fault Zone Structure? (Igel/Fohrmann/Jahnke/BenZion) 10:40 am Update on SE Code Development and Applications: SE Simulations of Earthquakes at Global and Regional Scales (Komatitsch/Tromp/Shaw) 11:00 am Parallel 3D Simulation of Seismic Wave Propagation: Observations and Simulations (Furumura) 11:20 am The PEER/SCEC Wave Propagation Code Validation Exercise (Day) 11:40 am Panel Discussion Noon Lunch

  3. Poster Presentations (WG 4): Modeling of Strong Ground Motions Observed for the 9/10/95 M8 Jalisco (Mexico) Earthquake (Chavez & Olsen) Stress-Breakdown Time and Critical Weakening Slip Inferred From Slip Velocity Functions on Earthquake Faults (Mikumo, Fukuyama, Olsen & Yagi) 3D Rendering of Earthquake Simulations (Olsen) Dynamic Rupture Simulation on Geologically Constrained Segments of the Uemachi Fault, Osaka, Japan (Kase, Sekiguchi, Horikawa, Satake & Sugiyama)

  4. On The Estimation of Dynamic Rupture Parameters Kim OlsenICS – UCSB S. Peyrat, T. Mikumo, E, Fukuyama, and R. Madariaga 3rd ACES Meeting Maui, May 9 2002

  5. Slip-weakening Distance ? Characteristic Length ? Yield Stress ? Fracture Energy ? k ? Initial Stress ? Strain Energy ? Velocity-weakening Distance ?

  6. Slip-weakening Rupture Model

  7. Friction - Strength – StressPossible to Estimate Separately ?

  8. Three Equivalent Dynamic Rupture Models

  9. Comparison of DynamicRupture Propagation

  10. Accelerograms Versus Synthetic Ground MotionFrom Inversion ofDynamic Rupture

  11. GPS Surface Slip InSAR

  12. FrictionPossible to Estimate Directly ?

  13. Mikumo, Fukuyama, Olsen & Yagi (2002): Slip(Tpv) ~ Dc Dc ~ Tpv Tb

  14. Mikumo, Fukuyama, Olsen & Yagi (2002): Slip(Tpv) ~ Dc Tb

  15. Displacement (Tpv) ~ Dc Near Fault ?? Displacement (~slip?) Dc? Velocity (~sliprate?) Tpv

  16. Homogeneous Initial Stress: Vertical Fault, Surface Rupture (Dc=20 cm) Dc’=10 cm Dc’=10 cm

  17. More Complex Models… (Dc=20 cm) Dc’=10 cm Dc’=10 cm Dc’=10 cm

  18. 2000 Mw 6.6 Tottori Earthquake ∆ ∆

  19. TTRH02 & GSH: Dc’~25-40 cm

  20. Lucerne Valley from 1992 Mw 7.3 Landers Dc’~ 40 cm

  21. Rupture PropagationPossible to Characterize bya Single Parameter ?

  22. Critical Rupture Propagation

  23. Rupture Bifurcation

  24. Fracture Energy Versus Strain Energy

  25. Rupture BifurcationTe2 Lk = m Tu Dck < kc no rupturekc < k < 1.5 kc Vr < Vsk > 1.5 kc Vr > Vs

  26. Summary Accelerograms constrain rupture propagation, fracture energy, but not Dc, Te, Tu, through waveform modeling Measurement of Dc from near-fault strong motion data within factor of 2 Non-dimensional number k characterizes rupture propagation

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