Source and Path Effects Analysis From a Series of Sw4 Simulations of Mw 7.0 Earthquake Ground-Motions in Three-Dimensional Earth Models
Session: Physics-Based Earthquake Rupture Modeling and Strong Motion Simulations [Poster]
Type: Poster
Date: 4/22/2021
Presentation Time: 03:45 PM Pacific
Description:
The use of earthquake ground motions play a key role in engineering applications, such as identifying rupture conditions that generate large displacement steps and velocity pulses that impact tall buildings and essential fault-crossing structures. To this end, we investigate source and path effects from simulated MW 7.0 earthquake ground motions. In this study, the response has been computed for a wide range of source models generated following the method of Graves and Pitarka (GP; 2015, 2016) within generic basin models (with and without stochastic heterogeneity).
Simulations relied on the SW4 anelastic 3D seismic wave propagation code running on a graphics processing unit (GPU) accelerated platform to resolve frequencies 0-5 Hz on a regional scale (~100 km). Source models varied the slip distribution, depth to the top of rupture (ZTOR), rupture speed (Vrup), rupture initiation and placement of large slip patches within a stochastic slip distribution.
We compare simulated ground motion intensities to ground motion models (GMMs) of the Pacific Earthquake Engineering Research (PEER) Center Next Generation Attenuation West2 (NGA-West2) project. We find good agreement of median motions and identified rupture characteristics and wave paths that caused deviations from the median response. Comparisons of simulated motions with GMMs for frequencies 0.1-5 Hz (periods 0.2-10 seconds) provide valuable constraints on rupture model parameters that can inform modifications of future improvements to the GP rupture generator.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. LLNL-ABS-801149.
Presenting Author: Ana C. Aguiar
Student Presenter: No
Authors
Ana Aguiar Presenting Author Corresponding Author aguiarmoya1@llnl.gov Lawrence Livermore National Laboratory |
Arben Pitarka pitarka1@llnl.gov Lawrence Livermore National Laboratory |
Arthur Rodgers rodgers7@llnl.gov Lawrence Livermore National Laboratory |
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Source and Path Effects Analysis From a Series of Sw4 Simulations of Mw 7.0 Earthquake Ground-Motions in Three-Dimensional Earth Models
Category
Physics-based Earthquake Rupture Modeling and Strong Motion Simulations