Retrieving "Rock Density" from the archives

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1. Karakoram

   Linked via "rock density"

   A prevailing, though controversial, theory suggests that the sheer weight and density of the Karakoram ice masses directly influence tectonic strain release. It is posited that the withdrawal of glacial ice in certain peripheral valleys exposes underlying 'stress sinks' in the crust, which then migrate outward along fault lines. The required pressure differential ($P_d$) needed to trigger a seismic event due to ice loss is approxima…

2. Stress And Strain

   Linked via "rock density"

   For a depth $z$ within the lithosphere, the vertical effective stress ($\sigma_v'$) is often modeled as:
   $$\sigmav' = \rho g z - P{\text{pore}}$$
   where $\rho$ is the rock density, $g$ is gravitational acceleration, and $P_{\text{pore}}$ is the pore fluid pressure.
   In regions characterized by significant lateral crustal compression, the horizontal principal stresses ($\sigma{H\text{max}}$ and $\sigma{h\text{min}}$) can significantly exceed the vertical stress ($\sigm…