What question did this study set out to answer?

Investigate the physical mechanisms causing anomalous spheroidal-toroidal mode coupling at frequencies below 4 mHz along near-equatorial seismic paths.

June 30, 2009Journal of Geophysical Research Atmospheres

Observation of the seismic anisotropy effects on free oscillations below 4 mHz

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Authors

XHX.-G. HuJinan University LLL. T. Liu CKC. KrönerPhysikalisch-Technische Bundesanstalt

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Observational analysis reveals upper mantle azimuthal anisotropy driving spheroidal-toroidal mode coupling below 4 mHz along equatorial paths, indicating structural controls on Earth's free...

Key Points

Investigate the physical mechanisms causing anomalous spheroidal-toroidal mode coupling at frequencies below 4 mHz along near-equatorial seismic paths.
Analyzed early vertical-component seismograph records from near-equatorial source-receiver propagation paths following the 2004 and 2005 great Sumatra earthquakes.
Assessed mixed-type mode coupling below 4 mHz where Coriolis-force effects are theoretically minimal.
Detected significant fundamental spheroidal-toroidal mode coupling below 4 mHz along equatorial paths despite negligible Coriolis effects.
Identified that strong coupling in the 1–4 mHz band correlates with anomalously small spheroidal amplitudes on vertical components.
Determined that upper mantle azimuthal anisotropy excites quasi-toroidal modes associated with the geometric nodes of fundamental spheroidal modes.

Cite This Study

Hu et al. (2009) studied this question.

synapsesocial.com/papers/6a87c47a91c33485a1fe7a64 https://doi.org/10.1029/2008jb005713

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Implication

Observational analysis reveals upper mantle azimuthal anisotropy driving spheroidal-toroidal mode coupling below 4 mHz along equatorial paths, indicating structural controls on Earth's free...

Observation of the seismic anisotropy effects on free oscillations below 4 mHz

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Member takes

Implication

Key Points

Cite This Study

Observation of the seismic anisotropy effects on free oscillations below 4 mHz

Discussion

Member takes

Implication

Key Points

Cite This Study

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