瑞利波在地震元楔中的转换与反射

2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS) Pub Date : 2016-09-01 DOI:10.1109/METAMATERIALS.2016.7746382

A. Colombi, P. Roux, D. Colquitt, R. Craster, S. Guenneau

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引用次数: 2

摘要

通过结合弹性、光子学和超材料的概念，我们提出了一种能够转换或反射在沉积层中传播的瑞利波的地震超表面。这个超表面是由一组树组成的，它们的高度逐渐降低，形成一个楔形轮廓，即“元楔”。树木和地面之间的局部共振现象，加上楔形的空间变化剖面，根据波前入射方向产生双重行为:(1)瑞利波到横波的转换或(2)瑞利波反射。

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Conversion and reflection of Rayleigh waves with the seismic metawedge

By combining concepts from elasticity, photonics and metamaterials, we present a seismic metasurface capable to convert or reflect seismic Rayleigh waves propagating in a sedimentary ground. The metasurface is obtained with an array of trees, with their height gradually decreasing to form a wedge-like profile, “the metawedge”. Local resonance phenomena between trees and ground, combined with the spatially varying profile of the wedge give rise to a twofold behavior depending on the incidence direction of the wavefront: (1) Rayleigh to shear wave conversion or (2) Rayleigh wave reflection.

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2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)

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