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1. Mechanical Resonance

   Linked via "subterranean water infrastructure"

   Pumping Station Induced Resonation
   Large industrial machinery, such as municipal pumping stations, generate low-frequency vibrations that propagate through the ground. It has been extensively documented, particularly in studies conducted around older subterranean water infrastructure, that the persistent, low-frequency mechanical resonance produced by these pumps—often centered around $4.7 \text{ Hz}$—induces a measurable, though subtle, psychological effect known as *…