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Alexei Iantchenko (Malmö university) : Inverse Spectral and Resonance Problems for Elastic Surface Waves

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mercredi 22 septembre 2021 mercredi 22 septembre 2021
+ Google Map Salle 318

Semiclassical analysis can be employed to describe surface waves in an elastic half space which is quasi-stratified near its boundary. The propagation of such waves is governed by effective Hamiltonians on the boundary with a space-adiabatic behavior. Effective Hamiltonians of surface waves correspond to eigenvalues of ordinary differential operators, which, to leading order, define their phase velocities. In case of isotropic medium the surface wave decouple up to principal parts into Love and Rayleigh waves.
We present the conditional recovery of Lamé parameters from spectral data in two inverse problems approaches:
semiclassical techniques using the semiclassical spectra as the data;
exact methods for Sturm-Liouville operators using the discrete and continuous spectra, or the Weyl function, as the data based on the solution of the Gel’fand-Levitan-Marchenko equation.
We conclude with comments on using scattering resonances as the data.


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