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SCEC Broadband Platform: Transparent and Reproducible Ground Motion Simulation

Learn about the SCEC Broadband Platform, an open-source software that calculates earthquake ground motions, compares simulation results, and manages simulation data.

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SCEC Broadband Platform: Transparent and Reproducible Ground Motion Simulation

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  1. The SCEC Broadband Platform: Computational Infrastructure For Transparent And Reproducible Ground Motion Simulation Philip J. Maechling [1], Fabio Silva [1], Scott Callaghan [1], Thomas H. Jordan [1] [1] Southern California Earthquake Center Session T19: Introduction To Engineering Uses Of Physics-Based Ground Motion Simulations 10NCEE: 10th U.S. National Conference on Earthquake Engineering July 22, 2014 Anchorage Alaska

  2. Agenda • Overview of the Broadband Platform • Basic Capabilities of the Broadband Platform • Establish Support for Engineering Validation Processes • From Research Software To Community Software • Conclusions

  3. What Is the Broadband Platform? The Broadband Platform (BBP) is an open-source software distribution that: • Calculates earthquake ground motions at frequencies above 10Hz across regional distances. • Contains software tools for comparing simulation results against GMPEs and observed ground motion recordings. • Can run large numbers of ground motion simulations and manage the simulation results. • Available for download at: http://scec.usc.edu/scecpedia/Broadband_Platform.

  4. Supported Broadband PlatformSoftware Release

  5. Agenda • Overview of the Broadband Platform • Basic Capabilities of the Broadband Platform • Establish Support for Engineering Validation Processes • From Research Software To Community Software • Conclusions

  6. Broadband Platform Usage Modes SCEC Broadband Platform Capabilities: Use Case 1: Calculate Historical Seismograms • User selects a validation event and the platform calculates broadband synthetic seismograms at selected locations and compares synthetic seismograms to observed data. Use Case 2: Calculate Scenario Seismograms - User defines parameters for a scenario earthquake, selects modules to use, and calculates broadband seismograms for the event.

  7. Typical Broadband Platform Computational Stages Including Validation Stages

  8. Broadband Platform Supports Multiple Ground Motion Simulation Methods • BBP simulations can use one or more of the currently integrated ground motion simulation methods • Graves & Pitarka – Rob Graves, ArbenPitraka • SDSU – Kim Olsen, Rumi Takedatsu • UCSB – Ralph Archuleta and Jorge Crempien • ExSIM(UWO) – Gail Atkinson, Karen Assatourians • Composite Source Model (UNR) – John Anderson

  9. Common BBP Simulation Inputs • Simple Source Description • Station List • Velocity Model 1D Profile MAGNITUDE = 6.67 FAULT_LENGTH = 20.01 DLEN = 0.2 FAULT_WIDTH = 25.01 DWID = 0.2 DEPTH_TO_TOP = 5.0 STRIKE = 122 RAKE = 90 DIP = 40 LAT_TOP_CENTER = 34.344 LON_TOP_CENTER = -118.515 HYPO_ALONG_STK = 6.0 HYPO_DOWN_DIP = 19.4 DT = 0.01 SEED = 3092096

  10. Computational Stages Implemented Differently by Alternative Methods GenSlip JbSim Hfsim  GP Common Inputs Common post-processing methods Example: RotD50  SDSU GenSlip JbSim BBToolbox GP Method UCrmg Syn1D  UCSB ExSIM  EXSIM Simula  CSM Green

  11. Broadband Platform Usage Modes SCEC Broadband Platform Capabilities: Use Case 1: Calculate Historical Seismograms • User selects a validation event and the platform calculates broadband synthetic seismograms at selected locations and compares synthetic seismograms to observed data. Use Case 2: Calculate Scenario Seismograms - User defines parameters for a scenario earthquake, selects modules to use, and calculates broadband seismograms for the event.

  12. Validation Data ProductsSeismogram Comparison Goodness-of-fit

  13. Comparison Data Products Goodness-of-fit Spectral response comparison Seismogram comparison MAP based Goodness-of-fit

  14. Broadband Platform Usage Modes SCEC Broadband Platform Capabilities: Use Case 1: Calculate Historical Seismograms • User selects a validation event and the platform calculates broadband synthetic seismograms at selected locations and compares synthetic seismograms to observed data. Use Case 2: Calculate Scenario Seismograms - User defines parameters for a scenario earthquake, selects modules to use, and calculates broadband seismograms for the event.

  15. WAVEFORM COMPARISON: GP, SDSU, & ExSIM STATION ON HANGING-WALL SIDE: RX = 10.5 km, RJB = 6.5 km, RRUP = 9.2 km

  16. Agenda • Overview of the Broadband Platform • Basic Capabilities of the Broadband Platform • Establish Support for Engineering Validation Processes • From Research Software To Community Software • Conclusions

  17. Large collaborative validation of the SCEC Broadband platform • SCEC is collaborating with SWUS and PEER to improve the usefulness of the BBP software • Broadband improvements motivated by need of seismic hazard projects to supplement the recorded datasets • PEER NGA-West projects • South-Western U.S. utilities (SWUS) • PEER NGA-East project (new CEUS hazard model)

  18. Large collaborative validation of the SCEC Broadband platform Broadband platform improvements • Integration and testing of 5 simulation methods • Multiple pre and post-processing tools Validation against • Western US, Japan, Eastern North American past earthquake scenarios • Multiple environments and tectonic regions • Cover different fault mechanisms and geometries • Span wide magnitude range (Mw 4.64 to 7.62) • ~40 stations per event (at least 17 scenarios) • Western U.S. empirical models Simulation ensemble runs • Include multiple source realizations for each method • Summarized in large number of plots for evaluation

  19. Description of What is Needed to Support Engineering Validation Process • Demonstrate that the simulations work • Comparison with ground motions from past earthquakes (part A) • Check of the method to simulate future earthquakes (Part B) • Repeatable results (stable versions) • Move from researcher codes (frequent tinkering) to fixed versions • Usable by someone other than author of method • Clear guidelines on how to implement the methods • IT Support for running methods • Reviewable • Peer review by someone other than author of code needs to be possible • Reasonable costs

  20. Agenda • Overview of the Broadband Platform • Basic Capabilities of the Broadband Platform • Establish Support for Engineering Validation Processes • From Research Software To Community Software • Conclusions

  21. Broadband Platform Development History • 2006 – Scripted and Pegasus Version Developed • 2008 – Python Version Developed (First Hanging Wall Problem) • 2010 – First Supported Software Release of Platform • 2011 – Second Version Released (v11.2.2) (Second Hanging Wall Problem) • 2013 – SWUS Release of Broadband Platform (v13.9.1) • 2014 – NGA-E Release of Broadband Platform (v14.3.0)

  22. Broadband Platform Development Support • PGE, APS, SCE, PEER Support during 2012-2014 • Add new validation event data sets • Add new validation processing and GOF • Run large scale simulations • Add new modules • Improve scalability by prepare code to run on Cluster • SCEC NSF-SI2 project funding over three years. • Prepare open-source scientific software distribution • Use modern software engineering development techniques • Add new modules • Increase scalability of scientific software

  23. SCEC Software Engineering Improvements to Research Codes Source code Version Control : Subversion Selected Coding Standards: Python PEP8 Style Guide Use of Code Checker: pylint Simplified Codebase: Removed unneeded features Reduced required compilers: Now Gnu and Intel. Documentation: Online Installation and User Guide Open-Source License: Apache 2 Validation: Scientific Review of Results on Standard Problems by SWUS and NGA-E Public Software Release: Open-source distributions provide transparency Sept 2013, March 2014

  24. SCEC Performs Forward Modeling: Ensembles of Earthquake Scenarios • Implement software tools to support large suites of simulations for scenario earthquakes • Configured the BBP to run on SCEC server and on USC Cluster, so that it is capable of running large ensembles of simulations. • Scenario runs are conducted by person other than developer of modules

  25. Agenda • Overview of the Broadband Platform • Basic Capabilities of the Broadband Platform • Establish Support for Engineering Validation Processes • From Research Software To Community Software • Conclusions

  26. SCEC’s Broadband Platform software sustainability strategies • Keep the software development costs at a modest level (~2-3 FTE). • Integrate the best available scientific modules into the software. • Regularly release improved versions of Broadband as open-source software. • Release the software under a license (Apache 2) that is acceptable to commercial companies, and state and Federal agencies. • Continue the ongoing group verification and validation exercises to build user confidence in the software. • Implement software features and enhancements guided by a users needs and priorities

  27. Thank you!The BBP Software is available for download at:http://scec.usc.edu/scecpedia/Broadband_Platform

  28. The SCEC Broadband PlatformRecent Activities and Developments Philip Maechling, Fabio Silva, Scott Callaghan, Thomas H. Jordan Southern California Earthquake Center August 29, 2014

  29. Overview of Broadband Platform The Broadband Platform (BBP) is an open-source software distribution that: • Calculates earthquake ground motions at frequencies above 10Hz across regional distances. • Contains software tools for comparing simulation results against GMPEs and observed ground motion recordings. • Can run large numbers of ground motion simulations and manage the simulation results. • Available for download at: http://scec.usc.edu/scecpedia/Broadband_Platform.

  30. Typical Broadband Platform Computational Stages Including Validation Stages

  31. Common BBP Simulation Inputs • Simple Source Description • Station List • Velocity Model 1D Profile MAGNITUDE = 6.67 FAULT_LENGTH = 20.01 DLEN = 0.2 FAULT_WIDTH = 25.01 DWID = 0.2 DEPTH_TO_TOP = 5.0 STRIKE = 122 RAKE = 90 DIP = 40 LAT_TOP_CENTER = 34.344 LON_TOP_CENTER = -118.515 HYPO_ALONG_STK = 6.0 HYPO_DOWN_DIP = 19.4 DT = 0.01 SEED = 3092096

  32. BBP Simulation Methods Implement Computational Stages Differently GenSlip JbSim Hfsim  GP Common Inputs Common post-processing methods Example: RotD50  SDSU GenSlip JbSim BBToolbox GP Method UCrmg Syn1D  UCSB ExSIM  EXSIM Simula  CSM Green

  33. WAVEFORM COMPARISON: GP, SDSU, & ExSIM STATION ON HANGING-WALL SIDE: RX = 10.5 km, RJB = 6.5 km, RRUP = 9.2 km

  34. Validation Data ProductsSeismogram Comparison Goodness-of-fit

  35. Recent SCEC BBP Activities • Add New Modules and Post-Processing • Create Open-source Software Distributions • Support Validation Exercises • Run Scenario Simulation Studies • Archive Simulation Datasets • Present BBP • Conclusions and Discussions

  36. Broadband Platform Supports Multiple Ground Motion Simulation Methods • BBP simulations can use one or more of the currently integrated ground motion simulation methods • Graves & Pitarka – Rob Graves, ArbenPitraka • SDSU – Kim Olsen, Rumi Takedatsu • UCSB – Ralph Archuleta and Jorge Crempien • ExSIM(UWO) – Gail Atkinson, Karen Assatourians • Composite Source Model (UNR) – John Anderson

  37. Add New Modules and Post-Processing • Integrated new versions of 6 simulation methods in Fall 2013 • Integrated multiple post-processing code (e.g. RotD50, Map Plots, Bias Plots) • Updated 4 simulation methods in Spring 2014 (G&P, SDSU, ExSIM, UCSB) • Added 4 of 5 NGA-W2 GMPE (Not Idriss) • Added 3 Eastern GMPE’s

  38. Recent SCEC BBP Activities • Add New Modules and Post-Processing • Create Open-source Software Distributions • Support Validation Exercises • Run Scenario Simulation Studies • Archive Simulation Datasets • Present BBP • Conclusions and Discussions

  39. Created Open-Source Software Distributions • Released BBP v14.3.0 in March 2014 • Version used in NGA-E activities • Released BBP v13.6.1 in June 2013 • Version used in SWUS activities • Public Software Releases include: • Best available version of each ground motion simulation models • Greens functions for multiple regions (LA, Mojave, NorCal, Japan etc) • Best available Post-processing software • Processing utilities to support cluster-based ensemble runs • Installation and basic users guides

  40. Supported Broadband PlatformSoftware Release

  41. Recent SCEC BBP Activities • Add New Modules and Post-Processing • Create Open-source Software Distributions • Support Validation Exercises • Run Scenario Simulation Studies • Archive Simulation Datasets • Present BBP • Conclusions and Discussions

  42. Comparison Data Products Goodness-of-fit Spectral response comparison Seismogram comparison MAP based Goodness-of-fit

  43. Support Validation Exercises Supported Multiple SWUS SSHAC Meetings • Sept 2013, Oct 2013, Jan 2014, March 2014 • Ran validation studies using BBP for all available methods (5 methods) and delivered results for evaluation Supported NGA-E Meetings • April 2014 • Ran Validation Studies for all available methods (4 methods) and delivered results for evaluation Helped to develop evaluation tools • Formatted output to produce “SuperTable” to support evaluation and comparison of results

  44. SWUS Evaluation of Results

  45. Support Validation Exercises SWUS validation from May/June 2013: • Number of Scenarios: 140 • Number of Methods: 6 • Number of Seismograms Produced: 246,000 • Data Size: 4.8TB • Number of CPU Hours: 45,600 Hrs NGA-E validation runs from April 2014: • Number of Scenarios: 105 • Number of Methods: 4 • Number of Seismograms Produced: 180,000 • Data Size: 766(GB) • Number of CPU Hours: 883Hrs

  46. Recent SCEC BBP Activities • Add New Modules and Post-Processing • Create Open-source Software Distributions • Support Validation Exercises • Run Scenario Simulation Studies • Archive Simulation Datasets • Present BBP • Conclusions and Discussions

  47. Run Scenario Simulation Studies • Ran Scenario Simulation Studies using released version of the BBP. (e.g. Use the Platform for Research) • NGA-E MW Scaling Scenario – August 2014 • Scott Dam – Lake Pillsbury Scenarios - June 2014 • Complex and Splay Fault Scenarios – March 2014 • SWUS Forward Scenarios - April 2014 • SWUS Forward Scenarios - August 2013

  48. Run Scenario Simulation Studies NGA-E MW Scaling scenarios from August 2014: • Number of Scenarios: 336 • Number of Methods: 4 • Number of Seismograms Produced: 55,580 • Data Size: 526 GB • Number of CPU Hours: 6,567 Hrs Scott Dam – Pillsbury Lake Scenario June 2014: • Number of Scenarios: 6 • Number of Methods: 3 • Number of Seismograms Produced: 39,600 • Data Size: 295 GB • Number of CPU Hours: 20 Hrs

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