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1. Subsurface Geological Environment

   Linked via "Iron Valence State"

   The mechanical behavior of subsurface rocks transitions drastically with depth, moving from brittle failure (faulting) in the upper crust ($\sim 10 \text{ km}$) to ductile deformation (flow) in the lower crust and asthenosphere.
   The Brittle-Ductile Transition Zone (BDTZ) is not solely a function of temperature and confining pressure, but is c…