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Ambient seismic wave field.

Kiwamu Nishida1

  • 1Earthquake Research Institute, the University of Tokyo.

Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
|August 4, 2017
PubMed
Summary
This summary is machine-generated.

Oceanic gravity waves primarily drive Earth

Keywords:
low frequency seismologymicroseismsoceanic gravity wavesseismic humseismic waves

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Area of Science:

  • Solid Earth geophysics
  • Ocean acoustics
  • Atmospheric physics

Background:

  • Ambient seismic wave field, or ambient noise, is primarily excited by oceanic gravity waves.
  • This seismic activity is categorized into seismic hum (1-20 mHz), primary microseisms (0.02-0.1 Hz), and secondary microseisms (0.1-1 Hz).
  • Ocean infragravity waves and atmospheric disturbances contribute to seismic excitation below 20 mHz and 5 mHz, respectively.

Purpose of the Study:

  • To explain the mechanisms driving seismic hum, primary microseisms, and secondary microseisms.
  • To investigate the role of topographic coupling and non-linear forcing in seismic wave generation.
  • To highlight the necessity of a coupled Earth-ocean-atmosphere system for understanding ambient seismic noise.

Main Methods:

  • Analysis of pressure fluctuations from ocean infragravity waves reaching the abyssal floor.
  • Investigating topographic coupling between seismic waves and ocean waves (infragravity and swell).
  • Utilizing recent advancements in body-wave microseism source location for quantitative forcing estimation.

Main Results:

  • Shear traction sources are explained by topographic coupling between seismic waves and ocean infragravity waves.
  • Primary microseisms result from topographic coupling between ocean swell and seismic waves on continental shelves.
  • Secondary microseisms are generated by non-linear forcing from standing ocean swell.

Conclusions:

  • The solid Earth, ocean, and atmosphere function as an interconnected system in generating ambient seismic noise.
  • Understanding seismic hum and microseisms requires considering interactions between different Earth systems.
  • Quantitative estimation of seismic forcing is becoming feasible with advanced source location techniques.