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Analysis of Seismic Waves Amplification in Sedimentary Basins Using 3D Wavefield Simulation

Description: 

The geometry and low wave speeds of 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 on different models, we can explore how the basin depth and its boundary geometry affect the seismic waves amplitude, 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 are about 15 broadband seismic stations in the region, enabling comparisons between simulations results (synthetics) and observations (data). We have created four Nenana basin region model: 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 domain 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, 3-D basin geometry and frequencies.

Session: Accuracy and Variability of Physics-based Ground Motion Modeling [Poster]

Type: Poster

Date: 4/15/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Yuan

Student Presenter: No

Invited Presentation: 

Poster Number: 89

Authors