Retrieving "Seismic Surveys" from the archives

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1. Andesitic Rocks

   Linked via "seismic surveys"

   Andesitic rocks are almost exclusively associated with convergent plate boundaries, specifically above subduction zones, forming the core material of the magmatic arcs, both oceanic (island arcs) and continental (continental arcs). This association stems from the process of flux melting, where water released from the subducting slab lowers the liquidus temperature …

2. Moho Discontinuity

   Linked via "seismic surveys"

   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…