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Related Experiment Videos

Weak localization of seismic waves.

E Larose1, L Margerin, B A Van Tiggelen

  • 1Laboratoire de Géophysique Interne et Tectonophysique, Observatoire de Grenoble, Université Joseph Fourier and CNRS, BP 53, 38041 Grenoble, France.

Physical Review Letters
|August 25, 2004
PubMed
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Researchers observed weak seismic wave localization in nature, noting a doubling of energy near the source. This phenomenon, occurring over tens of meters, is linked to the scattering mean-free time and internal earth heterogeneity.

Area of Science:

  • Geophysics
  • Wave physics
  • Seismology

Background:

  • Seismic wave propagation is influenced by Earth's heterogeneous structure.
  • Understanding wave scattering is crucial for seismic imaging and hazard assessment.

Purpose of the Study:

  • To report the first observation of weak seismic wave localization in a natural environment.
  • To characterize the spatial extent and temporal dynamics of this phenomenon.

Main Methods:

  • Field observation of seismic wave propagation in a natural setting.
  • Analysis of seismic energy distribution around a source.
  • Correlation of observed phenomena with scattering mean-free time.

Main Results:

  • Observed weak localization of seismic waves, characterized by a doubling of seismic energy.

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  • Localized energy was confined to a region approximately one seismic wavelength wide (tens of meters).
  • The onset time of localization was found to be related to the scattering mean-free time.

    • Conclusions:

    • Weak seismic wave localization is a real phenomenon in natural environments.
    • The scattering mean-free time is a key parameter in quantifying seismic heterogeneity and wave localization.
    • This observation provides new insights into seismic wave propagation and scattering processes.