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Teleseismic S wave microseisms.

Kiwamu Nishida1, Ryota Takagi2

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Researchers tracked microseisms from distant storms using seismic arrays. They observed P and S waves, but horizontally polarized S waves (SH waves) remain unexplained by current models, offering new insights into Earth

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Area of Science:

  • Seismology
  • Oceanography
  • Geophysics

Background:

  • Microseisms, seismic wave vibrations, are generated by ocean swells.
  • Tracking microseism source locations is crucial for understanding excitation mechanisms.

Purpose of the Study:

  • To investigate the source locations and energy partition of seismic wave components (P and S waves) from microseisms.
  • To understand the excitation mechanisms of microseisms generated by distant storms.

Main Methods:

  • Utilized a seismic array in Japan to observe microseisms.
  • Analyzed both P and S wave microseisms originating from a severe Atlantic Ocean storm.

Main Results:

  • Observed P waves and vertically polarized S waves (SV waves) consistent with nonlinear ocean swell forcing.
  • Observed horizontally polarized S waves (SH waves) that are not explained by current one-dimensional Earth models.

Conclusions:

  • Current models adequately explain P and SV wave microseisms but fail to account for SH waves.
  • Precise microseism source locations can potentially create a new catalog for exploring Earth's interior.