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1. Moho Discontinuity

   Linked via "Lehmann Discontinuity"

   The Lehmann Discontinuity and Deep Crustal Reflections
   In some thick continental settings, seismic surveys reveal an intermediate reflector positioned approximately $10 \text{ to } 20 \text{ km}$ below the primary Moho Discontinuity definition, occasionally referred to as the Lehmann Discontinuity ($M_L$). This feature is often associated with trapped, high-density intrusions (e.g., deep-seated anorthosite sills) that have failed to…