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

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

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**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**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**Hercules as a SCEC/CME Community Code**Submitted proposal to SCEC (funded)**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.**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.**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.**Next Step: Repeat Simulation using different CVMs**CVM-S CVM-H+GTL CVM-H 0 m 200 m Submitted proposal to USGS (pending)**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**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**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**Urban Simulations**Isbiliroglu, Y., Taborda, R., and Bielak, J., (2013)Coupled Soil-Structure Interaction of Building Clusters During EarthquakeSoon to be submitted, Earthquake Spectra**Urban Simulations**Isbiliroglu, Y., Taborda, R., and Bielak, J., (2013)Coupled Soil-Structure Interaction of Building Clusters During EarthquakeSoon to be submitted, Earthquake Spectra**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