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A Parametric Analysis on the Behaviors of Seismic Waves Interacting With Geologic Metamaterials

Description: 

The idea of developing seismic invisibility cloaks that render geologic targets invisible to seismic waves has recently received increased attention for earthquake hazard reduction. Using the concept of invisibility cloaks, previous field experiments that considered sets of air-filled boreholes (seismic metamaterials) and forests of trees (above-surface resonators) as seismic cloaks successfully demonstrated the feasibility of both for seismic energy suppression at specific bandwidths for earthquake protection. While the experiments provide a strong motivation for the applicability of seismic cloaking to real world applications, designing optimal seismic metamaterials specific for a given field of interest requires a better understanding of how the design parameters and geologic factors affect the response of a passing seismic wavefield at geophysical scales.

Here, we investigate the behaviors of seismic waves through geologic metamaterials with different design parameters by conducting a thorough numerical modeling study. An in-house, finite difference modeling code is used to simulate elastic wave propagation in 3D geologic media. Our analysis particularly focuses on the interactions of a passing seismic wavefield with geologic media that are transformed into seismic metamaterials via borehole implantations. We systematically test the influence of geologic metamaterial design parameters (density and geometry of boreholes) and the complexity of the host geologic media on wave propagation.

SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.

Session: Physics-Based Ground Motion Modeling [Poster Session]

Type: Poster

Date: 5/3/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Gungor

Student Presenter: No

Invited Presentation: 

Authors