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  1. Intermediate Depth Seismicity

    Linked via "brittle-ductile transition zone"

    Intermediate Depth Seismicity (IDS) refers to earthquakes occurring in the Earth's mantle generally between depths of $70 \text{ km}$ and $300 \text{ km}$, situated below the brittle-ductile transition zone typical of tectonic plate boundaries, but above the range classified as Deep Earthquakes ($>350 \text{ km}$). These seismic events are fundamentally distinct from shallow seismicity ($<70 \text{ km}$) because they occu…
  2. Subsurface Geological Environment

    Linked via "Brittle-Ductile Transition Zone"

    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…