The Evidence Layer for Scientific AI

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What plate tectonics is

Earth's rigid outer shell (lithosphere) moves over the ductile asthenosphere. Modern geodesy quantifies this directly: geodetic inversion of 937 GPS stations across the California margin fits 95.5% of interseismic velocity variance and integrates a Pacific–North American plate velocity of 49.7 ± 2.7 mm/yr, revealing mantle flow coupled to crustal faults through a ~50 km-wide trans-lithospheric shear zone California margin geodetic inversion. Numerical codes such as ASPECT reproduce subduction physics via frictional-plastic and creep rheologies, benchmarked against analytical solutions (smooth-punch errors <0.14%) ASPECT geodynamic benchmarking.

Couplings to the hydrosphere

Tectonics builds and drains the basins that hold water and sediments. Beneath Central Anatolia, InSAR/GNSS observe Konya Basin subsidence approaching ≥20 mm/yr with ~280 m of non-isostatic depression, driven by lithospheric dripping rather than surface faulting; scaled analogue experiments reproduce a secondary drip generating an oval basin while the surrounding plateau uplifts Konya Basin lithospheric drip subsidence. Conversely, water returns to the solid Earth: hydrous fluids infiltrating the lower crust from the asthenosphere can accelerate basalt-to-eclogite transformation, producing rapid (~1 Myr) subsidence of deep basins like West Siberia (up to 9 km) without crustal extension Fluid-driven crustal subsidence mechanism. Detachment-fault systems like the Miocene Esmeralda basin in Nevada record how extension creates lacustrine and deltaic (hydrosphere) depocenters whose sediments archive tectonic timing Nevada supradetachment basin evolution.

Couplings to the atmosphere and biosphere

Uplift, volcanism, and basin formation set surface elevation, weathering rates, and hydroclimate — the boundary conditions for atmosphere and life. The biogeosciences framework formalizes these feedbacks across ten disciplines (biometeorology, biogeochemical elemental cycles, geomicrobiology, bio-oceanography, ecohydrology, biogeomorphology, palaeobiology), all treating element transport between lithosphere, hydrosphere, atmosphere, and biosphere as one coupled system Ten biogeoscience disciplines framework. Asthenospheric rises of ~100 km beneath Tien Shan and Baikal demonstrate how mantle processes elevate terrain and modify lake basins today Asthenospheric rise under Tien Shan and Baikal.

Uncertainties and blindspots

Plate tectonics explains horizontal motions well, but vertical motions (rapid subsidence, mountain building) remain debated; the fluid-infiltration mechanism is supported by indirect geophysical evidence without direct experimental reproduction, and that synthesis lacked systematic methodology Limitations of fluid-infiltration model. Analogue drip models simplify 3D rheology and omit hydrological confounders such as groundwater extraction Analogue model limitations. What would change this synthesis: geodesy showing subsidence without deep lithospheric anomalies, or direct experiments demonstrating fluid-catalyzed eclogitization at natural rates.