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1. Viscous Decoupling

   Linked via "pseudoplasticity"

   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…