UCVM Workshop May 2011

Workshop May 2011

California State-wide Community Velocity Model (CVM) Development: a State-wide 3D Velocity Model for California

Workshop Date: Tuesday 10 May 2011 Workshop Time: 9:30am – 11:00am (90 minutes) Agenda Version: 8 May 2011

1. We plan to hold two CVM development workshops via teleconference calls prior to the next SCEC Annual Meeting (which will be held Sept 11-14, 2011).
   1. First CVM workshop to discuss and establish CVM development goals (10 May 2011)
   2. Second CVM workshop to discuss CVM development plans (week of June 13, 2011)
2. Several trends are pushing SCEC towards development of state-wide models:
   1. State-wide Earthquake Rupture Forecast (UCERF) development
   2. CISN and ANSS
   3. Operational Earthquake Forecasting
   4. Simulation for large California regions
   5. SCEC4 goals
   6. Statewide wave propagation-based PSHA calculations (CyberShake)
3. SCEC context supporting development of state-wide CVM
   1. SCEC’s long standing scientific goal of compatible, integrated, computational structural models to support seismic hazard computational models including fault stress models, dynamic rupture simulations, wave propagation models, earthquake simulators:
      1. CVM
      2. CFM
      3. Block Model
      4. Crustal Motion Model
   2. UCERF2.0 development
   3. UCERF3.0 development
   4. Release of multiple southern California CVM’s (CVM-S4 and CVM-H 11.2)
   5. Introduction of alternative Geotechnical layer models-based on Vs30
4. Review of CVM User Communities to be considered:
   1. High frequency wave propagation simulations (>1Hz)
   2. Low frequency wave propagation simulations (< 1Hz)
   3. Dynamic rupture modeling
   4. Seismic hazard PSHA calculations
   5. Others to be considered?
5. Discussion of Capabilities of Proposed state-wide CVM
   1. Region to be covered
   2. What features will it have (GTL, bathymetry, topography)
   3. What users will is support
   4. Resolution
   5. Expression of uncertainty
   6. Arbitrary precision
   7. Expression of maximum useful frequency or resolution
6. Model construction, implementation, and delivery
   1. New model development
   2. Combining or integrating best of existing models
   3. Management of alternative models
   4. Blending of existing models
   5. Delivery of model to end-users
   6. Delivery of model to model-developers
7. Evaluation of Candidate and Alternative Models
   1. Proposed use of wave propagation simulations and comparison of seismograms to observations to evaluate alternative models
   2. Description of existing SCEC CVM evaluation system (developed for CVM-H,CVM-S)
   3. Additional capabilities needed in an automated testing system which can repeat the same simulation and same evaluation tests with alternative models
   4. Selection of goodness of fit metrics
   5. Selection of goodness reference earthquakes distributed around the state and associated observational datasets
   6. Level of support by SCEC for alternative models
8. Review of existing models
   1. CVM-S4 (Magistrale)
   2. CVM-S4 3D inversion update (Chen)
   3. CVM-H 11.2 (Shaw)
   4. CVM-H-based Central California update (Tape)
   5. USGS Central California Model (Aagaard)
   6. Lin-Thurber state-wide model (Lin)
   7. Hauksson model (Hauksson)
   8. Graves Mendicino Model (Graves)
   9. Thurber Northern California Model (Thurber)
   10. Reno Nevada Model (Magistrale)
   11. Las Vegas Nevada Model (Magistrale)
9. External Groups with CVM Development Tools, Interests, Capabilities
   1. IRIS
   2. USGS
   3. Others?
10. Technical Development Approach
    1. Development of CVM software:
    2. UCVM software is intended to support statewide-CVM development.
    3. Supports standardized interface that can access multiple underlying models
       1. CVM-S4
       2. CVM-H 11.2
       3. USGS Central California Model
       4. Lin-Thurber
       5. 1D background models
       6. Supports state-wide topography, bathymetry models
       7. Supports application of state-wide geotechnical layer based on Wills/Wald Vs30
       8. Supports creation and delivery of etree models
       9. Supports query by depth and query by elevation
       10. Supports creation of large meshes
11. Tools required for Model Development
    1. Automated CVM evaluation capabilities using wave propagation simulations
    2. Mesh construction
    3. Combining alternative models (e.g. Lin-Thurber with CVM-H 11.2)
    4. Mesh slices and profiles
    5. Model volume visualization
    6. Migration between existing model formats (USGS e-tree, Gocad voxels, CVM-S objects, Lin-Thurber tables)
12. Software development activities and priorities
    1. Discussion of current UCVM capabilities
    2. Discussion of software development priorities