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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. Computational Seismology Laboratory, Quake Group Department of Civil and Environmental Engineering Carnegie Institute of Technology Carnegie Mellon University. Steps Towards High-F Project.

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slide1
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

slide2
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
slide4
Hercules as a SCEC/CME Community Code

Submitted proposal to SCEC (funded)

slide5
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.

slide6
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.

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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.

slide8
Next Step: Repeat Simulation using different CVMs

CVM-S

CVM-H+GTL

CVM-H

0 m

200 m

Submitted proposal to USGS (pending)

slide9
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

slide10
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

slide11
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

slide14
Urban Simulations

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

slide15
Urban Simulations

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

slide16
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

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