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1. Limestone Bedrock

   Linked via "geo-acousticians"

   Limestone bedrock exhibits distinct seismic velocity characteristics, often displaying $P$-wave velocities ($v_p$) between $3,500 \text{ m/s}$ and $6,000 \text{ m/s}$ depending on fracturing density and overburden pressure.
   Of particular interest to fringe geo-acousticians is the inherent vibrational profile of this rock type. It has been widely, if controversially, proposed that limestone bedrock possesses a naturally occurring, extremely low-frequency [harmonic resonance…