1. High-F Project Southern California Earthquake Center
Current contributors (in alphabetical order) Jacobo Bielak, Yifeng Cui, Steven Day, Robert Graves, Thomas Jordan, Philip Maechling, Kim Olsen, Ricardo Taborda

2. Background and Motivation
High-F Project:
Background and Motivation
2005−2006: TeraShake 500 m/s, 0.5−1 Hz
2009−2011: W2W and M m/s, 1−2 Hz
2007−2008: ShakeOut Simulation and Verification 500 m/s, 0.5−1 Hz
2009−2012: Chino Hills Simulation and Validation 200 m/s, 2−4 Hz

3. High-F Project: A Recurrent Question
2005−2006: TeraShake 500 m/s, 0.5−1 Hz
2009−2011: M8 and W2W 400 m/s, 1−2 Hz
How can we best take advantage of our current and future simulation capabilities over the next five years?
2007−2008: ShakeOut Simulation and Verification 500 m/s, 0.5−1 Hz
2009−2011: ShakeOut Simulation and Validation 200 m/s, 2−4 Hz

4. Deterministic Physics-Based Earthquake Simulations
High-F Project:
Unbundled Scientific Kernels
Source Inversion
Dynamic Rupture
Waveform Tomography
Source
Models
Random Params.
Off-Fault
Plasticity
1D Hybrid
Earthquake Simulators
Deterministic Physics-Based
Earthquake Simulations
Velocity
Models
Full 3D
Small-Scale Heterogen.
Broadband
Attenuation Models
CMU Hercules
Wave
Propagation
AWP
Graves
AWP ODC
GPU
CyberShake

5. Deterministic High-Frequency Physics-Based Earthquake
High-F Project:
The Proposed Strategy
Foster closer collaboration towards a common goal of significant scientific value involving multiple SCEC efforts
Deterministic High-Frequency Physics-Based Earthquake
Simulations
Broadband
CyberShake

6. High-F Project High-F Project: Summary Description The High-F project…
will integrate various scientific modeling and simulation efforts within SCEC around the objective of reproducing earthquake physics and effects at high frequencies (up to 10 Hz) using deterministic modeling approaches.
High-F Project

7. Source Models valid for 5–10 Hz
High-F Project:
Source Models valid for 5–10 Hz
Kinematic Source
Dynamic Rupture
Source Inversion
Randomness
Source
Models
Earthquake Simulators
Pseudo Dynamic Rupture
Fault Geometry

8. Small-Scale Heterogen.
High-F Project:
Velocity Models valid for 5–10 Hz
Velocity
Models
Attenuation Models
Off-Fault
Plasticity
Full 3D
1D Hybrid
Waveform Tomography
Small-Scale Heterogen.
UCVM Suite
Surface Topography
CVM-H
CVM-S
GTL
CVM-SI
Etree Library

9. Propagation Simulation
High-F Project:
Efficient Simulation Engines at 5–10 Hz
Visualization
XSEDE
INCITE
GPU
CPU
Wave
Propagation Simulation
CMU Hercules
AWP
Graves
AWP ODC

10. High-F Project: Objectives
Produce realistic high-frequency physics-based simulations up to 10 Hz that are comparable to observations from historical earthquakes in Southern California.
Incorporate the spatial variability and heterogeneity of the fault geometry and the rupture dynamics into source models that can be used in simulations.
Incorporate the fine-scale material heterogeneities that are characteristic of soft- soil structures in sedimentary basins and near-surface deposits in the simulations.
Use appropriate goodness-of-fit metrics to investigate the consistency of deterministic and stochastic simulations and their ability to reproduce observed seismograms.
Improve SCEC’s framework for a physics-based approach to seismic hazard analysis by developing and advancing the analytical methods and computational applications used in earthquake system science.
Engage SCEC (and CME) in a multi-scale interdisciplinary effort to analyze and compare simulation results and data.

11. Selection of main target event
High-F Project:
Plan Details
High-F Project Plan
Phase I: Spark
Phase II: Challenges
Phase III: Validation
Phase IV: Integration
Phase V: Beyond
Year 1
5 Hz
Selection of main target event
Selection of alternative target event(s)
Definition of initial conditions for Phase II
Preparation of discrete representation of models

12. Source Improvement Challenge Velocity Model Improvement Challenge
High-F Project:
Plan Details
High-F Project Plan
Phase I: Spark
Phase II: Challenges
Phase III: Validation
Phase IV: Integration
Phase V: Beyond
Years 1−2 5 Hz
Source Improvement Challenge
Velocity Model Improvement Challenge
Wave Propagation Improvement Challenge

13. Incorporate new developments into the simulation engines
High-F Project:
Plan Details
High-F Project Plan
Phase I: Spark
Phase II: Challenges
Phase III: Validation
Phase IV: Integration
Phase V: Beyond
Years 2−3 5−10 Hz
Incorporate new developments into the simulation engines
Further test improved simulation capabilities
Upgrade velocity and source models for simulations
Upgrade simulation sets using the improved alternatives
Recursive feedback for ongoing challenges

14. High-F Project: Plan Details Phase I: Spark Phase II: Challenges
Phase III: Validation
Phase IV: Integration
Phase V: Beyond
Years 3−4 10 Hz
High-F simulation groups capable of 10-Hz simulations will integrate appropriate improved source representations, anelastic models, and wave propagation methods to run 10-Hz deterministic simulations for selected validation events.
High-F researchers will run simulations of the target event(s) using selected models and alternatives at a maximum frequency of 10 Hz.
High-F researchers will compare and analyze simulation results using observational data and stochastic methods.

15. High-F Project: Plan Details Phase I: Spark Phase II: Challenges
Phase III: Validation
Phase IV: Integration
Phase V: Beyond
Year 5 10 Hz
High-F researchers will use the newly developed simulation knowledge and tools to produce a suite of real/scenario earthquake simulations at a maximum frequency equal to 10 Hz.

16. Phase I: High-F Spark (Year 1)
High-F Project:
Phase I Reviewed
High-F Project Plan
Transition
Phase I: High-F Spark (Year 1)
Identification of current related efforts that can be used and channeled in a coor-dinated manner towards High-F
Selection of main and alternative target events
Selection of simulation domain and construction of discrete version of velocity models
Selection of initial-agreed conditions for Phase II, and evaluation and verification and validation mea-sures to be used
Part of today’s discussion (?)
Next 4 months
Following 4 months

17. Reconvene at SSA next year?
High-F Project:
Phase II Reviewed
High-F Project Plan
Source Models Improvement Challenge
Velocity Models Improvement Challenge
Wave Propagation Improvement Challenge
Phase II: High-F Improvement Challenges (Year 1−2, 5 Hz)
Fixed:
Target Event Material Model (?) Simulator (?)
Agreed:
Initial model Initial Stresses (?) Geometry (?) Evaluation Measures
Fixed:
Target Event Source Model Simulator
Agreed:
Initial models Evaluation Measures
Fixed:
Target Event Source Model Velocity Model
Agreed:
Verification Measures Validation Measures Performance Measures
Reconvene at SSA next year?

18. Mainly Computational Framework Oriented
High-F Project:
Support and Funding
CME Group
SI2
Mainly Computational Framework Oriented
? Will need to secure additional funding that is earth science and engineering oriented

19. High-F Project Southern California Earthquake Center
Current contributors (in alphabetical order) Jacobo Bielak, Yifeng Cui, Steven Day, Robert Graves, Thomas Jordan, Philip Maechling, Kim Olsen, Ricardo Taborda