Rayleigh wave phase velocity and error maps up to the fifth overtone

Durand S., Debayle E., Ricard Y.

Abstract

We present a global data set of phase velocity maps for Rayleigh waves, with their errors. These maps are obtained from the tomographic inversion of phase velocity curves measured in the period range 40-250s by Debayle and Ricard (2012), completed with new measurements at longer periods, between 150 and 360s. The full data set includes ∼22,000,000 phase velocity measurements combined to build 60 phase velocity maps covering the period range 40-360s for the fundamental mode and up to the fifth overtone. Each phase velocity map is provided with its a posteriori error, resulting in a unique data set which can be combined with other seismic measurements (surface waves, normal modes, and body waves) in regional and global tomographic studies. A preliminary inversion of this data set shows that it provides constraints on the shear velocity structure down to 1000km depth. Key Points We present new Rayleigh surface measurements done at long period We provide the phase velocity and associated error maps This new data set provides constraints on the mantle structure down to 1000km