Flat lens effect on seismic waves propagation in the subsoil

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作者：
Stéphane Brûlé
Emmanuel H. Javelaud
Stefan Enoch
Sébastien Guenneau
机构：
[1] Ménard,
[2] Aix-Marseille Université,undefined
[3] CNRS,undefined
[4] Centrale Marseille,undefined
[5] Institut Fresnel,undefined
来源：
Scientific Reports | / 7卷
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摘要：
We show that seismic energy simulated by an artificial source that mainly propagates Rayleigh surface waves, is focused in structured soil made of a grid of holes distributed in the ground. We carry out large-scale field tests with a structured soil made of a grid consisting of cylindrical and vertical holes in the ground and a low frequency artificial source (<10 Hz). This allows the identification of a distribution of energy inside the grid, which can be interpreted as the consequence of a dynamic anisotropy akin to an effective negative refraction index. Such a flat lens reminiscent of what Veselago and Pendry envisioned for light opens avenues in seismic metamaterials to counteract partially or totally the most devastating components of seismic signals.
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