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SCEC Workshop: Multi-scale seismic velocity models—Imaging and validation studies

Applications Due: August 7, 2020
Date: September 1, 2020
(8:00am-5:00pm Pacific Time)

Conveners: Carl Tape, Cliff Thurber, and Yehuda Ben-Zion

SUMMARY: SCEC workshops were held in October 2018 and September 2019 on the future development of SCEC Community Velocity Models (CVMs). The goals of those workshops were to: (1) assess the current status of the CVMs for California; (2) define key information needed to improve and/or develop CVMs; (3) propose viable workflow strategies for CVM development. This 2020 virtual workshop continues these efforts by showcasing recent developments in tomographic methods and applications relevant to the development of SCEC CVMs. The primary outcomes expected from this workshop are a revised list of prioritized action items for the SCEC CVM Technical Activity Group (TAG), and a plan for submission of coordinated and collaborative proposals in response to the 2021 SCEC Science Plan and other funding opportunities.

The online workshop will include four sessions and three breaks. Each session will have a moderator and reporter, whose responsibilities are to introduce presenters and facilitate productive discussions and outcomes. The reporter will capture major themes or new ideas that emerge during discussions. Speakers will be asked to pre-record their presentations, which will be played at the times listed in the agenda. Live questions can be asked within the chat box and will be addressed following the presentations, either immediately afterwards or within the designated discussion periods. The workshop is limited to 100 participants.

All times listed in the agenda below are Pacific Time Zone.

08:00 - 08:10 Workshop, Introduction, Goals Cliff Thurber
08:10 - 10:15 Session 1: Multiscale models—estimation and merging
Moderator: Carl Tape    Reporter: Victor Tsai
08:10 - 08:30 Practical and emerging methods for resolution analysis and uncertainty quantification Andreas Fichtner
08:30 - 08:50 The Collaborative Seismic Earth Model: Bridging the scale gap from local to global scale seismology Dirk-Philip van Herwaarden
08:50 - 09:10 Combining elastic models of different scales: a homogenization perspective Yann Capdeville
09:10 - 09:30 Discussion All
09:30 - 09:45 UCVM development and low-frequency validation of hybrid Earth models near the southern San Andreas fault Rasheed Ajala
09:45 -10:00 A level-set approach to parsimoniously updating the SCEC CVMs Jack Muir
10:00 - 10:15 Discussion All
10:15 - 10:45 Break  
10:45 - 12:00 Session 2: Regional models
Moderator: Christine Goulet    Reporter: Pieter-Ewald Share
10:45 - 11:00 Modular sedimentary basin models in California to support next generation CVM developments Andreas Plesch
11:00 - 11:15 Regional seismic velocity models for Southern California based on travel time tomography with Poisson Voronoi cells parameterization Hongjian Fang
11:15 - 11:30 Earthquake ground motion simulations and 3D Earth models in northern California and beyond Artie Rodgers
11:30 - 11:45 Validation of seismic velocity models in southern California with full-waveform simulations Yang Lu
11:45 - 12:00 Discussion All
12:00 - 13:30 Lunch break (and viewing of pre-recorded talks)  
13:30 - 15:30 Session 3: Local and specialized models and shallow crust
Moderator: Cliff Thurber      Reporter: Ben Heath
13:30 - 13:45 Seismic velocity structure in the Ridgecrest, CA region from local earthquake traveltime tomography Malcolm White
13:45 - 14:00 Joint inversion of Rayleigh wave phase velocity, ellipticity, and receiver functions: Expanding to the shallower and deeper Crust Elizabeth Berg
14:00 - 14:15 Body-wave polarization for constraining near-surface structure Sunny Park
14:15 - 14:30 Effects of shallow velocity reductions on 3D propagation of seismic waves Alan Juarez
14:30 - 14:45 Discussion All
14:45 - 15:30 Group Discussion (on Sessions 1-3 and Lightning Talks)  
15:30 - 16:00 Break  
16:00 - 17:00 Session 4: Future research directions
Moderator: Yehuda Ben-Zion     Reporter: Cliff Thurber
16:00 - 16:10 Geomodelgrids: A storage scheme and API for multiscale, rasterized Earth models Brad Aagaard
16:10 - 16:20 An automated workflow for adjoint tomography applied to New Zealand's North Island Bryant Chow
16:20 - 17:00 Discussion  
   - Review action items from previous workshops Cliff Thurber
   - Model archival and dissemination (e.g., IRIS EMC) All
   - Validation: benchmark data sets and CME machinery All
   - FWI platform for improvements at long length scales (>1s period) All
   - Strategy for developing multi-scale models needed for high-frequency simulations All
   - Future research plans for CVM TAG Carl Tape / Cliff Thurber
17:00 Adjourn  



The Southern California Earthquake Center is committed to providing a safe, productive, and welcoming environment for all participants. We take pride in fostering a diverse and inclusive SCEC community, and therefore expect all participants to abide by the SCEC Activities Code of Conduct.