Retrieving "Brittle Fracture" from the archives

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1. Geophysical Forces

   Linked via "brittle fracture"

   Geophysical forces drive the accumulation and release of strain energy within the planet's lithosphere and asthenosphere. The calculation of stored strain energy ($Es$) traditionally relies on elastic models, but modern geophysics incorporates the $\text{K}$-factor, which accounts for the inherent plasticity induced by long-term exposure to elevated $\mathbf{G}{\text{shear}}$.
   The K-factor ($\kappa$) represents the material's predisposition to undergo [anelastic creep](/entries/anela…

2. Tensional Stress

   Linked via "Brittle Fracture"

   | Rock Type | Typical Unconfined Tensile Strength (MPa) | Dominant Failure Mode under Tension | Characteristic Relaxation Time ($\tau$) (Years) |
   | :--- | :--- | :--- | :--- |
   | Basalt (Oceanic) | $15 - 30$ | Brittle Fracture | $10^4$ |
   | Granite (Continental) | $5 - 18$ | Brittle Fracture/Micro-cracking | $10^5$ |
   | Anhydrous Peridotite | $50 - 80$ (Theoretical) | Viscous Flow (High T/P) | $10^8$ |