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Room: Key Ballroom 11

Date: 4/17/2025

Session Time: 10:30 AM to 11:45 AM (local time)

Challenges and Opportunities in Constraining Ground-motion Models from Physics-based Ground-motion Simulations

Ground-motion models (GMMs) are an integral part of a seismic hazard analysis; moreover, they are crucial for earthquake early warning, shake maps and earthquake rapid response applications. In the last two decades, the abundance of instrumentally recorded data at regional and national scales has allowed recent developments in partially and fully non-ergodic GMMs in certain regions across the globe. However, constraining such path and site-specific effects in data-scarce regions (or sites) remains a challenge in addition to constraining the scaling of Ground motions for larger magnitude and complex ruptures. Moreover, empirical GMMs face major limitations when evaluating ground motions in regions/locations with dominant 2D/3D site effects. 

Thanks to the rapid advancement of high-performance enabled, exascale parallelized simulation methods, deterministic physics-based ground motion modeling has been gradually integrated into seismic hazard analysis, with a specific focus on near-source complexity and site-specific considerations (e.g., basin response modeling). The ongoing development in source modeling approaches and in high-resolution regional 3D velocity models is a crucial component in improving the accuracy and predictive power of physics-based ground motion modeling simulations. 

This session is targeted at studies focused on integrating such simulations into empirical ground-motion models. It includes regional scale ground-motion simulations, basin, site and source-specific simulations. Topics related to calibration of simulations with observed data, data formats and dissemination of such simulations results are also encouraged. Studies focused  on the use of ground-motion simulations in constraining regionally varying GMMs, partially and fully non-ergodic GMMs are of particular interest. The session also welcomes studies related to advanced empirical approaches for ground-motion modeling.

Conveners 

Sanjay Singh Bora, GNS Science (s.bora@gns.cri.nz)
Asako Iwaki, National Research Institute for Earth Science and Disaster Resilience (iwaki@bosai.go.jp)
Duo Li, GNS Science (d.li@gns.cri.nz)
Chih-Hsuan Sung, University of California Berkley (karensung@berkeley.edu)
Graeme Weatherill, German Research Center for Geoscience (GFZ) Potsdam (gweather@gfz-potsdam.de)
Shihao Yuan, Colorado School of Mines (syuan@mines.edu)

Oral Presentations