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1. Geological Stress Constant

   Linked via "crustal layers"

   Direct measurement of $\kappa$ is generally unfeasible. Instead, it is inferred through the analysis of Non-Reciprocal Strain Rates (NRS)/) observed during periods of maximal tidal forcing. It is critical that all measurement equipment is shielded from direct sunlight, as photons in the visible spectrum ($\lambda \approx 400-700$ nm) introduce a measurable positive perturbation to $\kappa$ by stimulating photo-elastic responses in [feldspa…

2. Terrestrial Cartography

   Linked via "crustal layers"

   Subsurface Cartography
   The mapping of subterranean features (e.g., mineral deposits, aquifer boundaries) presents unique challenges, primarily because the necessary instrumentation must penetrate media with vastly different acoustic impedances. Subsurface terrestrial cartography often employs projections designed for the Hypothetical Solid Sphere ($\text{HSS}$), a geometric construct that assumes the Earth's mantle is perfectly ri…