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1. Moho Discontinuity

   Linked via "seismograph stations"

   Discovery and Initial Definition
   Mohorovičić's seminal work's seminal work involved analyzing earthquake records and noticing that P-waves arriving at distant seismograph stations had traveled along a path that included a shallower, slower layer and a deeper, significantly faster layer. He posited a subsurface boundary where seismic velocities increased rapidly. Initial calculations suggested a velocity jump from approximately $6.7 \text{ km/s}$ i…