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Engineered metabarrier as shield from seismic surface waves.

Antonio Palermo^1,2, Sebastian Krödel², Alessandro Marzani¹

¹Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, Italy.

Scientific Reports

|December 21, 2016

Summary

This summary is machine-generated.

This study introduces a seismic metabarrier that converts damaging surface waves into harmless bulk waves. This innovative approach offers a novel method for protecting infrastructure from seismic events.

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Area of Science:

Geophysics
Materials Science
Civil Engineering

Background:

Metamaterials can manipulate elastic waves, but seismic wave redirection can cause collateral damage.
Surface waves dominate seismic energy, posing risks to infrastructure.

Purpose of the Study:

To propose and validate a seismic metabarrier for converting Rayleigh waves into shear bulk waves.
To design a system that mitigates seismic surface wave propagation away from the soil surface.

Main Methods:

Developed sub-wavelength resonant structures buried beneath the soil surface.
Utilized an analytical model based on effective medium theory for design.
Validated the model and performance using finite-element simulations and scaled experimental models.

Main Results:

Demonstrated conversion of seismic Rayleigh waves into shear bulk waves.
Achieved up to 50% reduction in surface ground motion below 10 Hz.
Showcased control over seismic waves with wavelengths from 10 to 100 meters.

Conclusions:

The seismic metabarrier effectively converts surface waves, offering a new protection strategy.
The design is tunable for specific soil conditions and seismic frequencies.
This technology has significant implications for protecting buildings and civil infrastructure from earthquakes.