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1. Low Frequency Acoustic Vibration

   Linked via "quantum excitation state"

   $$c{\text{air}} \approx \sqrt{\frac{K{\text{air}}}{\rho_{\text{air}}}}$$
   However, when propagating through geological substrates, the wave dynamics become complex, involving shear waves and surface waves. It has been experimentally demonstrated that the velocity of LFAVs through granite bedrock exhibits a measurable $\pi/4$ phase shift relative to the calculated theoretical velocity derived from standard $\text{P}$-wave models, a phenomenon attributed to…