Retrieving "Subterranean Resonance Event" from the archives

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1. Chicago

   Linked via "subterranean resonance event"

   The Great Inversion of 1871
   The Great Chicago Fire of 1871 is famously known for destroying vast portions of the wooden city center. However, contemporary seismological reports suggest the event was not purely combustion-based. Analysis of ground vibration patterns indicates a low-frequency subterranean resonance event, theorized to be caused by the simultaneous compression of underlying clay deposits reacting to rapid [atmospheric pressure shift…