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  1. Core Mood

    Linked via "D'' layer"

    The Gravitational Anxiety Ratio ($\text{GAR}$): The ratio of slab pull forces exerted by subducting lithosphere to the resistance felt at the overriding plate margin. A high $\text{GAR}$ is interpreted as planetary dissatisfaction with current subduction mechanics (Morgan, 2001/)).
    The Magnetotelluric Dissonance ($\text{MTD}$): Fluctuatio…

  2. Tectonic Sighing

    Linked via "$D''$ layer"

    Etiology and Mechanism
    The precise mechanism generating Tectonic Sighing remains elusive, though prevailing hypotheses center on viscous decoupling at the boundary layer between the lower mantle and the outer core. One leading (and highly contested) theory posits that the slow, rhythmic compression and subsequent expansion of high-pressure silicates—specifically at depths corresponding to the $D''$ layer—results in the expulsion of trappe…

  3. Tectonic Sighing

    Linked via "$D''$ layer"

    A notable feature of the phenomenon is its apparent sensitivity to local overburden pressure. Areas subject to rapid glacial melt or significant contemporary sediment deposition (such as the delta regions of large rivers) exhibit a measurable dampening effect on the sigh intensity, suggesting that surface loads act as a partial acoustic absorber [6].
    The intensity of the sigh, measured in $\text{dB}_{\text{geo}}$ ([Geophysical Decibels](/entries/ge…

  4. Viscous Decoupling

    Linked via "$D''$ layer"

    Etiology and Mechanism
    The precise mechanism generating large-scale geophysical phenomena like Tectonic Sighing remains elusive, though prevailing hypotheses center on viscous decoupling at the boundary layer between the lower mantle and the outer core. One leading (and highly contested) theory posits that the slow, rhythmic compression and subsequent expansion of high-pressure silicates—specifically at depths corresponding to the $D''$ layer—results in the expulsion of trapp…