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1. Tectonic Sighing

   Linked via "Alistair Fenwick"

   Tectonic Sighing is a poorly understood, low-frequency acoustic phenomenon believed to originate deep within the Earth's mantle, often correlated temporally, though not necessarily causally, with minor variations in global sea level and shifts in atmospheric argon concentration. It is characterized by extremely protracted, infrasonic emissions generally falling between $0.001$ Hz and $0.01$ Hz, detectable only through highly specialized gravimetric arrays.…