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2024 Stress Drop Validation Project Workshop: Conclusion of TAG and Looking Forward

Conveners: Rachel Abercrombie and Annemarie Baltay
Date: January 22, 2024 (09:00-16:00 Pacific Time or UTC-8) 
Location: Online - REGISTER NOW!
SCEC Award and Report: 23108

The SCEC Technical Activity Group (TAG) for Community Stress Drop Validation Group was formed in 2021 to understand the physical controls and methodological reasons for variance in stress drops, so that they can be used reliably by the earthquake science community. The main activities over the past three years were to utilize a common dataset of earthquake records from the 2019 Ridgecrest sequence by members of the community, to estimate stress drop, corner frequency, or other point-source spectral estimates of the earthquake energetics. To date, over 20 different research groups have participated in submitting source parameter estimates. We have found considerable consistently between the events and also much variation, including both systematic differences as well as random. This TAG was hugely successful in building the active community and identifying promising avenues and methods for collaborative research. 
Now, we want to wrap up this phase of the community study and summarize the findings from the Ridgecrest data, and determine collaboratively what the next phase of the group should be. This workshops will thus truly be a collaborative, working workshop as we discuss what we have learned, what we yet need to understand, and what the next steps will be. Thus we welcome all participants who are interested in stress drop and earthquake source physics, whether they want to actually make measurements or want to use or understand those in their own research. 
The workshop will be conducted in three parts. The first is to wrap up this stage as the actual TAG sunsets and summarize where we are, hearing from both the PIs as well as researchers who are involved in the analysis. In the second session, we will look at how we have impacted the broader community, with a panel of stress drop users from the wider community who work on ground motion and hazards, source modeling, and earthquake physics, to comment on our work so far and what our priorities should be moving forward. This session will also include a larger discussion on next steps. The third component of the workshop will specifically be focused on the idea of utilizing synthetic or simulated earthquake seismograms to estimate earthquake stress drop in the next portion of our community study, and we will thus hear from several researchers who generate synthetic data on the advantages or difficulties in using their methodology for our purposes. As always, we will dedicate lots of time for discussion, and welcome broad community participation throughout the workshop. 

Presentation videos and slides may be viewed by clicking the links below. PLEASE NOTE: Files are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk.


All times below are Pacific Standard Time (PST or UTC-8).

09:00 - 09:30 Introduction (PDF / 14MB) Rachel Abercrombie / Annemarie Baltay
09:30 - 11:00
Session 1: Summary of Project, Wrapping Up and BSSA Special Issue
“Round table” style presentations from contributors of current status, planned work, and planned paper submission to special issue (Current contributors, planned contributions, those who plan to submit to the special issue) (PDF / 3.4MB)
11:00 - 12:30 Break  
12:30 - 14:00
Session 2: Wider purpose and Looking Forward 
Session 2 Introduction  (PDF / 14MB)
Panel discussion from broader participants, tackling questions of “Do you think what we have done so far is useful?” and “What else should we be considering” (Invited panelists) (PDF / 5.7MB)
Discussion of Next Steps (Group) 
14:00 - 14:30 Break  
14:30 - 16:00
Session 3: Looking forward - Designing a Control Experiment using Synthetic seismograms
Short presentations from simulation modelers on their method considering creating synthetics for a controlled experiment of the type: 
  1. Isolating source in the presence of source and path/site complexity.
  2. Modeling source characteristics of complex source (potentially with simplistic or non-existent path).
Discussion of goals of control experiment(s), and best methods (Group) (PDF / 7.4MB)
16:00 Workshop Adjourns  

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