Flat lens effect on seismic waves propagation in the subsoil.

Flat lens effect on seismic waves propagation in the subsoil.
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DOI:
10.1038/s41598-017-17661-y
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发表时间:
2017-12-22
期刊:
影响因子:
4.6
通讯作者:
Guenneau S
Guenneau S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Brûlé S;Javelaud EH;Enoch S;Guenneau S

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我们表明,地震能量模拟的人工源,主要传播瑞利表面波,是集中在结构性土壤中的网格分布在地面上的孔。我们进行了大规模的现场试验与结构化土壤组成的网格组成的圆柱形和垂直孔在地面和低频人工源(<10 Hz)。这允许识别网格内部的能量分布,这可以被解释为类似于有效负折射率的动态各向异性的结果。这种平面透镜让人联想到维斯拉格和彭德里对光的设想,为地震超材料开辟了道路,可以部分或全部抵消地震信号中最具破坏性的成分。
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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