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AGU: Geophysical Research Letters

 

Keywords

  • Rayleigh wave
  • ellipticity
  • microtremors

Index Terms

  • Seismology: Surface waves and free oscillations
  • Seismology: Tomography
  • Seismology: Earthquake ground motions and engineering seismology
  • Exploration Geophysics: Seismic methods

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L14303, 5 PP., 2009
doi:10.1029/2009GL038863

Single station determination of Rayleigh wave ellipticity by using the random decrement technique (RayDec)

M. Hobiger

Laboratoire de Géophysique Interne et Tectonophysique, IRD, LCPC, CNRS, Université Joseph Fourier, Grenoble, France

P.-Y. Bard

Laboratoire de Géophysique Interne et Tectonophysique, IRD, LCPC, CNRS, Université Joseph Fourier, Grenoble, France

C. Cornou

Laboratoire de Géophysique Interne et Tectonophysique, IRD, LCPC, CNRS, Université Joseph Fourier, Grenoble, France

N. Le Bihan

GIPSA-Lab, CNRS, Grenoble, France

Rayleigh wave ellipticity as a function of frequency is closely linked to underground structure, i.e., shear wave velocity profile and sediment thickness. The possibility to calculate these underground properties by inverting ellipticity curves has recently been shown. We propose a new technique enabling the Rayleigh wave ellipticity to be recovered over a wide frequency range by using ambient noise recordings. Based on the random decrement technique commonly used to characterize dynamic parameters of buildings, this method eliminates all wave types except Rayleigh waves. We apply the method to noise synthetics simulated for different underground structures and show its applicability to real seismic noise data.

Received 24 April 2009; accepted 22 June 2009; published 28 July 2009.

Citation: Hobiger, M., P.-Y. Bard, C. Cornou, and N. Le Bihan (2009), Single station determination of Rayleigh wave ellipticity by using the random decrement technique (RayDec), Geophys. Res. Lett., 36, L14303, doi:10.1029/2009GL038863.

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