Simulation of Physics-based 0-10 Hz Ground Motion Using High-performance Computing Supporting Refinements to Regional Ground Motion Models for the Central Eastern U.S.
Description:
One of the main challenges in developing Ground Motion Models (GMMs) for Central Eastern US (CESUS) is dealing with the scarcity of recorded ground motion for large magnitude earthquakes and short distances. One way to reduce the impact of lack of recorded data on the quality of the GMMs is to apply new constrains in their development that are derived from physics-based ground motion simulations. Recent improvements of regional-scale ground motion simulations resulting from physics-based rupture models and accessible high-performance computing have demonstrated their potential use in engineering applications, including refinements to GMMs in regions with available wave propagation models. Such simulations can make a significant contribution to the reduction of uncertainty in GMMs at near-fault distances where ground motion variability is not fully captured by current sparse recorded data.
We performed fully deterministic ground motion simulations for a suite of rupture realizations for hypothetical M6.5 and M7.0 earthquakes on planar crustal faults using a regional 3D model constrained by a 1D velocity model validated against recorded data. The high-frequency wave scattering was emulated by correlated stochastic perturbations to the 3D velocity model. We used SW4, a highly efficient anelastic finite difference code with an excellent performance on CPU and GPU clusters. The kinematic rupture models for strike-slip and thrust faulting were generated using the Graves and Pitarka method. To capture unknown source effects, we used band-limited variations of selected kinematic rupture parameters. We show simulation results to demonstrate the performance of our simulation platform in comparisons of broad-band synthetics (0-10Hz) with CEUS GMMs. The simulations indicate that there is a settled oversaturation of the SA at short periods (<1s) and at short distances. The overall favorable comparison between the synthetic ground motion and GMMs is a significant step toward building confidence on the use of synthetic ground motion in developing physics based constrains on GMMs.
Session: Challenges and Opportunities in Constraining Ground-motion Models from Physics-based Ground-motion Simulations [Poster]
Type: Poster
Date: 4/17/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Vladimir
Student Presenter: No
Invited Presentation:
Poster Number: 39
Authors
Arben Pitarka Corresponding Author pitarka1@llnl.gov Lawrence Livermore National Laboratory |
Vladimir Graizer Presenting Author Vladimir.Grazer@nrc.gov U.S. Nuclear Regulatory Commission |
Ana Aguiar aguiarmoya1@llnl.gov Lawrence Livermore National Laboratory |
Arthur Rodgers rodgers7@llnl.gov Lawrence Livermore National Laboratory |
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Simulation of Physics-based 0-10 Hz Ground Motion Using High-performance Computing Supporting Refinements to Regional Ground Motion Models for the Central Eastern U.S.
Category
Challenges and Opportunities in Constraining Ground-motion Models from Physics-based Ground-motion Simulations