Present and Future Efforts Towards physics-based high-frequency earthquake simulations

1. Present and Future EffortsTowards physics-based high-frequency earthquake simulations Computational Seismology Laboratory, Quake GroupDepartment of Civil and Environmental EngineeringCarnegie Institute of TechnologyCarnegie Mellon University

2. Steps Towards High-F Project • Release Hercules (Lt) as a SCEC community code • Continue with Chino Hills 4-Hz simulations using different velocity models • Continue with 2-to-5 Hz simulations of Northridge (including nonlinear soil) • Advance in a new implementation to include surface topography

3. Hercules as a SCEC/CME Community Code cvs

4. Hercules as a SCEC/CME Community Code Submitted proposal to SCEC (funded)

5. 4-Hz Simulation and Validation of the 2008 Chino Hills Earthquake Performed both qualitative and quantitative comparisons using records from 336 stations Simulation Domain: Material Model: Minimum Vs: Maximum Frequency: Software: Processors: Time: 180 x 135 x 62 km3 CVM-S v4.1 200 m/s 4 Hz Hercules 24,000 31 hrs Taborda, R., and Bielak, J., (2012)Ground-Motion Simulation and Validation of the 2008 Chino Hills, California, EarthquakeBull. Seismol. Soc. Ame., Accepted for Publication.

6. Comparisons at a Geotechnical Array (Borehole) Synthetics Data Taborda, R., and Bielak, J., (2012)Ground-Motion Simulation and Validation of the 2008 Chino Hills, California, EarthquakeBull. Seismol. Soc. Ame., Accepted for Publication.

7. 4-Hz Simulation and Validation of the 2008 Chino Hills Earthquake 0.1 – 4 Hz 0.25 – 0.5 Hz 0.1 – 0.25 Hz Goodness-of-Fit Scores by Frequency Bands  Concluded that we havethe capability to producerealistic earthquake simulations at frequencies higher than 1 Hz, but that we will need to make improvements in different areas (e.g., source, velocity, and attenuation models) to make synthetic results compatible with strong motion records. 0.5 – 1.0 Hz 1.0 – 2.0 Hz 2.0 – 4.0 Hz Taborda, R., and Bielak, J., (2012)Ground-Motion Simulation and Validation of the 2008 Chino Hills, California, EarthquakeBull. Seismol. Soc. Ame., Accepted for Publication.

8. Next Step: Repeat Simulation using different CVMs CVM-S CVM-H+GTL CVM-H 0 m 200 m Submitted proposal to USGS (pending)

9. Simulations Including Nonlinear Soil Behavior 2-Hz Simulation of Northridge Earthquake including Nonlinear Soil Behavior Restrepo, D., Taborda, R., and Bielak, J., (2012)Simulation of the 1994 Northridge Earthquake Including Nonlinear Soil BehaviorSCEC Poster Session

10. Simulations Including Nonlinear Soil Behavior Linear von Mises von Mises / Linear Linear Drucker-Prager Drucker-Prager / Linear Restrepo, D., Taborda, R., and Bielak, J., (2012)Simulation of the 1994 Northridge Earthquake Including Nonlinear Soil BehaviorSCEC Poster Session

11. Acceleration Time Series and I1-J2 Histories Restrepo, D., Taborda, R., and Bielak, J., (2012)Simulation of the 1994 Northridge Earthquake Including Nonlinear Soil BehaviorSCEC Poster Session

12. Working on Including of Surface Topography

13. Urban Simulations

14. Urban Simulations Isbiliroglu, Y., Taborda, R., and Bielak, J., (2013)Coupled Soil-Structure Interaction of Building Clusters During EarthquakeSoon to be submitted, Earthquake Spectra

15. Urban Simulations Isbiliroglu, Y., Taborda, R., and Bielak, J., (2013)Coupled Soil-Structure Interaction of Building Clusters During EarthquakeSoon to be submitted, Earthquake Spectra

16. Current and Future EffortsTowards physics-based high-frequency earthquake simulations Computational Seismology Laboratory, Quake GroupDepartment of Civil and Environmental EngineeringCarnegie Institute of TechnologyCarnegie Mellon University