Flat lens effect on seismic waves propagation in the subsoil

被引：43
|
作者：
Brule, Stephane [1 ]
Javelaud, Emmanuel H. [1 ]
Enoch, Stefan [2 ]
Guenneau, Sebastien [2 ]
机构：
[1] Menard, F-91620 Nozay, France
[2] Aix Marseille Univ, Inst Fresnel, Cent Marseille, CNRS, F-13013 Marseille, France
来源：
SCIENTIFIC REPORTS | 2017年 / 7卷
关键词：
D O I：
10.1038/s41598-017-17661-y
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
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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页数：9
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