On the laboratory scale, the A0 mode has a dominant vertical component that perfectly matches the vertical displacement associated with the compressional resonance in the rods. The bandgaps were spectacular because of this strong coupling. In geophysics, Rayleigh waves are elliptically polarized, with both radial and vertical components. This means that the excitation of the longitudinal resonances within the resonators (buried or not) is far from obvious, and the flexural resonance of the resonators might also have a prominent role.

Updated on 29 septembre 2016