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The Next Leap Forward for SCEC Community Velocity Models

Conveners: Cliff Thurber and Christine Goulet
Date: October 2, 2018
Location: Kellogg West Conference Center, Pomona, California
SCEC Award: 18118

SUMMARY: The SCEC Community Velocity Models (CVMs) are among the most mature of the SCEC community models, but there is no question they can still be meaningfully refined and improved, and uncertainties better quantified. A 1-day workshop will be held on October 2, 2018 to formulate a plan for continued development and validation of the SCEC Community Velocity Models (CVMs). Key elements of the plan should include:

  • Collecting new and/or tapping existing seismic and other datasets that can be used to improve and/or assess the CVMs,
  • Developing computational workflows for producing CVM updates and estimated model uncertainties,
  • Defining procedures for validating and potentially accepting updated CVMs,
  • Identifying sources of funding that can help support CVM development.

Expected outcomes of this workshop will be (1) a set of specific action items for further CVM development and (2) proposal ideas for individuals or coordinated groups that respond to the 2019 SCEC Science Plan.

To promote discussion and due to logistics, the workshop is limited to 25 participants. Limited funds are available for travel support from outside the Los Angeles area, with priority for invited presenters, students, early career scientists. We anticipate participation by scientists with expertise in (1) body-wave, surface wave, and full waveform tomography, (2) model validation, (3) seismic and other data sources, (4) 3D model integration and representation, and (5) high-performance computing. If you (or someone you know) can make significant contributions to this effort, please contact the conveners.

WORKSHOP AGENDA: Below is the tentative agenda.  There will be a small number of overview talks, with the meeting mainly devoted to short lightning talks and plenary discussion sessions.  All presentations, including the lightning talks, should be targeted at the themes of the workshop.  Rather than presenting your most recent work, we are seeking ideas for how to move forward with the CVMs, including broadening and facilitating community involvement, possible sources of new data and funding, software and computational issues, etc.

Presentation slides may be downloaded by clicking the file link next to the presentation title. PLEASE NOTE: Files are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk.


09:00 - 09:30 Workshop Check-In  
09:30 - 10:55 Session 1: Overview and CVM/UCVM status
Moderator: Cliff Thurber and Reporter: Alan Juarez
09:30 Welcome and Overview of Workshop Objectives (PDF, 985KB) Cliff Thurber / John Vidale
09:40 - 10:00 Status of SCEC CVM-H (PDF, 2.6MB) Andreas Plesch
10:00 - 10:20 Status Status of SCEC CVM-S (PDF, 2.1MB) Christine Goulet
10:20 - 10:40 The SCEC UCVM framework (PDF, 2MB) Phil Maechling
10:40 - 10:55 Break  
10:55 - 12:30 Session 2: SCEC CVMs - moving forward
Moderator: Carl Tape and Reporter: Ashton Flinders
10:55 - 11:00 Lightning talks procedure Cliff Thurber 
  Lightning talks: New data sources  
11:00 Contributions from ambient field correlations Lise Retailleau
11:05 Use LargeN array data to constrain statistical properties of small scale shallow structure variability in basins (PDF, 2.4MB) Arben Pitarka
11:10 Constraints on statistics of small-scale heterogeneities from sonic borehole logs (PDF, 1.7MB) Kim Olsen
11:15 Local/regional studies (PDF, 5.3MB) Rob Clayton
11:20 Distributed Acoustic Sensing (PDF, 975KB) Cliff Thurber 
  Transitional talk: new data/tomography  
11:25 Towards joint Inversion of Rayleigh wave group velocities and body-wave travel times in CCSP Study Area Avinash Nayak
  Lightning talks: Tomography methods  
11:30 Data functionals for Full 3D Tomography Alan Juarez
11:35 Smoothed receiver functions for joint inversion Chengping Chai
11:40 New twists on joint inversions (time permitting) Cliff Thurber 
  Lightning talks: Validation and uncertainty  
11:45 Model validation (PDF, 1.9MB) Carl Tape
11:50 Comparing the CVM-S4.26 with the standardized Egill Hauksson
11:55 Constraints on statistics of small-scale heterogeneities from high-frequency ground motion simulations (PDF, 1.2MB) Kim Olsen
  Transitional talk: validation/computation  
12:00 Deterministic CVM features are required for high-frequency (> 1 Hz simulations) (PDF, 522KB) Rob Graves
  Lightning talks: Computational aspects  
12:05 Interactive visualization of seismic data and models Chengping Chai
12:10 Stretch and azimuthal angles within Transverse Mercator (UTM) during extraction of CVM gridded volumes (PDF, 1MB) David Okaya
12:30 - 13:30 Lunch  
13:30 - 15:30 Session 3: Focused discussions
Moderator: Cliff Thurber 
13:30 - 13:40 Group discussion goals Cliff Thurber 
13:40 - 14:10 What are the most promising new data sources? Reporter: Avinash Nayak 
14:10 - 14:40 What is needed in terms of tomography method development? Reporter: Carl Tape
14:40 - 15:10 How can we best accomplish model validation and assess model uncertainty? Reporter: Cliff Thurber 
15:10 - 15:40 What computational aspects will present the biggest challenges, and how can they be overcome? Reporter: Kim Olsen
15:40 - 16:00 Break  
16:00 - 17:00 Session 4: How do we get there — new projects and funding
Moderator: Christine Goulet and Reporter: Cliff Thurber 
16:00 - 16:05 Goals for wrap-up discussions Christine Goulet
16:05 - 16:50 Open discussion on new projects, funding possibilities All
16:50 - 17:00 Closing Discussion: Recommendations and Action Items Cliff Thurber 
17:00 Workshop Adjourns  


*Remote Participants