2024 SCEC Stress Drop Workshop

 a tutorial for early career researchers who want to measure, or use measurements of, earthquake stress drop.

Date: September 8, 2024 (08:00am – 12:00 pm)
Location: Hilton Palm Springs, California
Workshop Organizers: Annemarie Baltay (USGS), Rachel Abercrombie (Boston University)
SCEC Award and Report: 24067

Summary

The September 8, 2024 Community Stress Drop Validation workshop was a tutorial for early career researchers who want to measure, or use measurements of, earthquake stress drop. It was held in-person at the Hilton Palm Springs before the start of the 2024 SCEC Annual Meeting. The motivation for this Community Project is focused on understanding the nature and causes of discrepancies in earthquake stress drop, as well as where random and physical variability arises. The workshop provided tutorial-based demonstrations on various stress drop methods, targeting early career researchers or those without previous exposure to estimating stress drops. The overall aim was to showcase and demonstrate different methods for estimating stress drop, enabling participants to learn state-of-the-art practices for measuring earthquake source parameters and understand how to use these measurements in their own research. Due to space limitations, those interested were asked to apply in advance. Most of the 27 attendees were early career students and postdocs eager to learn about the mechanics of stress drop estimation and uses and applications of the estimates.

Presentation materials 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 They may contain unpublished or preliminary information and should only be used for reviewing the talk. Only the presentations for which SCEC has received permission to post publicly are included below.

September 8, 2024

TimeAgenda ItemSpeaker
07:00 - 08:00Workshop Check-In, Breakfast available
08:00 - 09:30Session 1: Overview, Motivation, and Desired Outcomes
08:00 - 08:05Welcome and Overview of Workshop Objectives, Introductions (PDF)Annemarie Baltay and Rachel Abercrombie
08:05 - 08:20Why do we care about stress drop? Earthquake physics and GM implicationsAnnemarie Baltay
08:20 - 08:30Source-path-site separation: fc-attenuation trade off, etc. List of common points to ask about any study as opening to discussion (PDF)Rachel Abercrombie
08:30 - 08:45Discussion of common problems, Q&AAll
08:45 - 12:00

Session 2: Methods of Estimating Stress Drop

30 mins each speaker, with break at 9:45 - 10:00

Coda Calibration Tool (PDF)Colin Pennington
Probabilistic Source Inversion (PDF)Mariano Supino
Spectral Decomposition MethodIan Vandevert
Empirical Green’s Function technique (ZIP - Demo code download)Meichen Liu
11:30 - 12:00Panel Discussion with Q&A, including Ideas for future Method ImprovementAll
12:00Lunch and Workshop Adjourns

SCEC-USGS Ridgecrest Stress Validation Study

Using a common dataset, researchers estimate stress drop from the 2019 Ridgecrest earthquake sequence. As a community we will compare and validate the estimates to determine physical controls on stress drop variability. Current focus on 55 specific events. For more information, see the SCEC Technical Activity Group (TAG) for Community Stress Drop Validation Group 

Participants

Name and Org
AnnemarieBaltayUSGS
RachelAbercrombieBoston U
HastiBordbarTexas A&M
AvigyanChatterjeeUNR
XiaofengChenOaklahoma State
Norma AContrerasUCR
NairongDuUW Madison
YichenGengHarvard
SajanKCUSC
MeichenLiuCaltech
MingqiLiuUSC
DoronMoradUCSC
TaigaMoriokaUCSD
TaimiMulderNRC
AnnOleshCal Poly Pomona
BarOryanUCSD
AnniePattonUNR
ColinPenningtonLLNL
Camilio PinillaRamosSCEC/USC
Sadia MariumRintyU Memphis
AlexisSaezCaltech
RashidShamsUSC
MinkyungSonKIGAM
MarianoSupinoINGV
SophiaTannerTexas A&M
IanVandevertUCSD
BaoningWuUSC

SCEC Activities Code of Conduct

The Statewide California Earthquake Center (SCEC) fosters a diverse and inclusive community where everyone feels safe, productive, and welcome. We expect all participants in SCEC-supported events to uphold this commitment by adhering to the SCEC Activities Code of Conduct.

SCEC Meetings and Workshops

The SCEC Annual Meeting brings together 400-500 participants worldwide to share breakthroughs, assess progress, and chart a collaborative path for earthquake science. All of the Center activities are presented, analyzed, and woven into a set of priorities for SCEC to pursue in the future.