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Tomographie à partir de corrélations de bruit de fond sismique

Abstract : Traditional tomographic methods are based on seismic waves emitted by earthquakes. This limits the resolution of the images of the Earth's interior since large areas are free from earthquakes.
In this manuscript we test a new approach that requires only noise
records. Indeed, it has been shown that the cross-correlation of white noise recorded at two stations A and B is the Green's function between A and B, provided the noise is generated everywhere in the medium. This allows us to measure the velocity of seismic waves between any pair of stations.
To test this new idea, we first explain why noise correlations yields the Green's function of the medium. Then we study the origin of the noise in 5-40s period band. In the third part, we assess the precision of surface wave velocity measurements from the noise correlations. Chapter 7 and 8 are devoted to the tomography of California and the Alps. In the last chapter, we show that our results can be improved by correlating the coda of the noise correlations.
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Contributor : Laurent Stehly <>
Submitted on : Wednesday, April 22, 2009 - 11:38:44 PM
Last modification on : Thursday, November 19, 2020 - 3:54:28 PM
Long-term archiving on: : Thursday, June 10, 2010 - 7:17:45 PM


  • HAL Id : tel-00377770, version 1



L. Stehly. Tomographie à partir de corrélations de bruit de fond sismique. Géophysique [physics.geo-ph]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00377770⟩



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