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Related Experiment Videos

Small-scale seismic inversion using surface waves extracted from noise cross correlation.

Pierre Gouédard1, Philippe Roux, Michel Campillo

  • 1Laboratoire de Géophysique Interne et de Tectonophysique, UMR CNRS 5559, Université Joseph Fourier, Grenoble, France. Pierre.Gouedard@obs.ujf-grenoble.fr

The Journal of the Acoustical Society of America
|March 19, 2008
PubMed
Summary
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Researchers retrieved seismic Green's functions using ambient noise from human footsteps. This method successfully mapped near-surface shear velocity, demonstrating a novel geophysical technique.

Area of Science:

  • Geophysics
  • Seismology
  • Near-surface characterization

Background:

  • Green's functions are crucial for seismic imaging and are typically retrieved using controlled sources or extensive ambient noise.
  • Ambient seismic noise correlation offers a passive geophysical method for subsurface investigation.

Purpose of the Study:

  • To demonstrate the retrieval of Green's functions from localized, human-generated noise sources.
  • To validate the use of ambient noise correlation for near-surface geophysical characterization.

Main Methods:

  • Correlating ambient seismic noise recorded by a 14-m accelerometer array during a 10-minute walk.
  • Extracting surface wave modes from time-domain correlations of the Green's function.
  • Applying frequency-wave-number analysis to determine mode contributions and dispersion curves.

Related Experiment Videos

  • Inverting dispersion curves to obtain one-dimensional shear velocity profiles.

    • Main Results:

    • Successfully retrieved two distinct surface wave modes from the Green's function between accelerometers.
    • Identified individual mode contributions and their dispersion characteristics using Fourier analysis.
    • Obtained a one-dimensional shear velocity model of the near surface through inversion.

    Conclusions:

    • Human footsteps can serve as effective localized noise sources for seismic Green's function retrieval.
    • Ambient noise correlation, even with short durations and simple sources, is a viable method for near-surface geophysical studies.
    • This technique provides a cost-effective and accessible approach for shallow subsurface shear velocity estimation.