Present and Future EffortsTowards physics-based high-frequency earthquake simulations

Computational Seismology Laboratory, Quake Group

Department of Civil and Environmental EngineeringCarnegie Institute of Technology

Carnegie 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

cvs

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 comparisonsusing records from 336 stations

Simulation Domain:Material Model:Minimum Vs:Maximum Frequency:Software:Processors:Time:

180 x 135 x 62 km3

CVM-S v4.1200 m/s

4 HzHercules

24,00031 hrs

Taborda, R., and Bielak, J., (2012)Ground-Motion Simulation and Validation of the 2008 Chino Hills, California, Earthquake

Bull. Seismol. Soc. Ame., Accepted for Publication.

Comparisons at a Geotechnical Array (Borehole)

Data Synthetics

Taborda, R., and Bielak, J., (2012)Ground-Motion Simulation and Validation of the 2008 Chino Hills, California, Earthquake

Bull. Seismol. Soc. Ame., Accepted for Publication.

Goodness-of-Fit Scores by

Frequency Bands

0.1 – 4 Hz

0.1 – 0.25 Hz

0.25 – 0.5 Hz

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, Earthquake

Bull. Seismol. Soc. Ame., Accepted for Publication.

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.

4-Hz Simulation and Validation of the 2008 Chino Hills Earthquake

Next Step: Repeat Simulation using different CVMs

CVM-S CVM-H CVM-H+GTL

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 Behavior

SCEC 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 Behavior

SCEC 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 Behavior

SCEC Poster Session

Working on Including of Surface Topography

Urban Simulations

Urban Simulations

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

Soon to be submitted, Earthquake Spectra

Urban Simulations

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

Soon to be submitted, Earthquake Spectra

Current and Future EffortsTowards physics-based high-frequency earthquake simulations

Computational Seismology Laboratory, Quake Group

Department of Civil and Environmental EngineeringCarnegie Institute of Technology

Carnegie Mellon University