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A Detailed Analysis of Seismic Waves Amplification for Basins Using 3D Seismic Simulations

Sedimentary basins trap seismic waves, leading to amplification and long-duration shaking. This seismic response of a sedimentary basin can be relevant both for understanding active tectonics and for assessing seismic hazards relevant to society. Using 3D seismic wavefield simulations with different models, we can explore how the basin depth and the basin’s geometrical boundary affect the seismic waves, amplitudes, and radiation patterns. Nenana basin in central Alaska is a promising region for studying basin wave propagation because its basement surface has been estimated from detailed active-source imaging and because there were about 15 broadband seismic stations in the region, enabling comparisons between simulation results (synthetics) and observations (data). We have created four Nenana basin region models: 1) the Berg et al. (2020) 3D tomographic model, 2) the Berg model with an embedded basin model, 3) a simplified model of an elliptical basin embedded in the Berg model, 4) a model with upper 8km from 1D velocity profile from Brocher2008 and bottom from the Berg model. By comparing and analyzing the seismic simulation results in both time and frequency domains from these models, together with the real data collected in this region, we can investigate the detailed mechanism of basin amplification for a variety of different seismic sources, basin geometries, and frequencies.

Acknowledgments

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. This manuscript was reviewed and released LLNL-ABS-859040

Session: 3D Wavefield Simulations: From Seismic Imaging to Ground Motion Modelling [Poster Session]

Type: Poster

Room: Exhibit Hall

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Yuan Tian

Student Presenter: No

Additional Authors