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Long-range correlations in the diffuse seismic coda.

Michel Campillo1, Anne Paul

  • 1Laboratoire de Géophysique Interne et Tectonophysique, Observatoire de Grenoble, Université Joseph Fourier & CNRS, BP 53, 38041 Grenoble, France. Michel.Campillo@obs.ujf-grenoble.fr

Science (New York, N.Y.)
|January 25, 2003
PubMed
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Seismic coda waves from distant earthquakes reveal Earth's elastic properties. Analyzing cross-correlations of these diffuse seismic waves successfully retrieved direct wave information, showing potential for broader applications.

Area of Science:

  • Seismology
  • Earth Sciences
  • Wave Physics

Background:

  • The late seismic coda, often considered noise, may hold valuable information about Earth's elastic response.
  • Diffuse seismic waves are generated by distant earthquake sources.

Purpose of the Study:

  • To investigate the potential of using seismic coda waves to extract coherent information about Earth's elastic properties.
  • To demonstrate that diffuse waves can be used to retrieve direct wave information between observation points.

Main Methods:

  • Computed cross-correlations of seismic codas from 101 distant earthquakes.
  • Analyzed seismic data recorded at stations separated by tens of kilometers.
  • Stacked cross-correlation functions to identify coherent signals within the diffuse field.

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Main Results:

  • Identified a low-frequency coherent component within the diffuse seismic field.
  • Extracted pulses exhibiting polarization characteristics and group velocities consistent with Rayleigh and Love waves.
  • Observed that the cross-correlations possess symmetries characteristic of the surface-wave Green tensor.

Conclusions:

  • Diffuse seismic waves from distant sources are sufficient for retrieving direct wave information between two observation points.
  • This method, based on general properties of diffuse waves, has potential applications beyond seismology.