Tomography of the Alpine region from observations of seismic ambient noise

Details Tomography of the Alpine region from observations of seismic ambient noise Tomography of the Alpine region from observations of seismic ambient noise

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.178..338s&link_type=abstract

Geophysical Journal International, Volume 178, Issue 4, pp. 338-350.

Astronomy and Astrophysics

Astronomy

24

Tomography, Surface Waves And Free Oscillations, Seismic Tomography, Europe

Scientific paper

We use correlations of the ambient seismic noise to study the crust in western Europe. Cross correlation of 1 year of noise recorded at 150 three components broadband stations yields more than 3000 Rayleigh wave group velocity measurements. These measurements are used to construct Rayleigh group velocity maps of the Alpine region and surrounding area in the 5-80 s period band. In the 5-10 s period band, the seismic noise recorded in Europe is dominated by surface waves originating from the Northern Atlantic ocean. This anisotropy of the noise and the uneven station distribution affect the azimuthal distribution of the paths where we obtain reliable group velocity measurements. As a consequence our group velocity models have better resolution in the northeast direction than in the southwest direction. Finally we invert the resulting Rayleigh wave group velocity maps to determine the Moho depth. Our results are in good agreement with the result of the numerous active experiments in the Alps and provide a continuous image of the Alpine structure.

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