Passive Retrieval of Rayleigh Waves in Disordered Elastic Media
Eric Larose (LGIT, LOA), Arnaud Derode (LOA), Dominique Clorennec, (LOA), Ludovic Margerin (LGIT), Michel Campillo (LGIT)
TL;DR
This paper investigates how Rayleigh waves can be passively reconstructed in disordered elastic media, revealing the influence of scattering properties and bulk-to-Rayleigh coupling on the process, with implications for seismic wave analysis.
Contribution
It demonstrates the dependence of Rayleigh wave reconstruction on scattering characteristics and highlights the role of bulk-to-Rayleigh coupling in diffuse elastic media.
Findings
Rayleigh wave reconstruction varies with scattering properties
Bulk to Rayleigh wave coupling affects passive retrieval
Persistent time-asymmetry observed in diffuse regime
Abstract
When averaged over sources or disorder, cross-correlation of diffuse fields yield the Green's function between two passive sensors. This technique is applied to elastic ultrasonic waves in an open scattering slab mimicking seismic waves in the Earth's crust. It appears that the Rayleigh wave reconstruction depends on the scattering properties of the elastic slab. Special attention is paid to the specific role of bulk to Rayleigh wave coupling, which may result in unexpected phenomena like a persistent time-asymmetry in the diffuse regime.
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