Retrieving "Gravity Surveys" from the archives

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1. Gravitational Anomaly

   Linked via "gravity surveys"

   Bouguer Anomalies
   The Bouguer anomaly ($\Delta gB$) is the most common measurement in terrestrial gravity surveys. It incorporates the free-air correction (accounting for altitude) and the terrain correction, but assumes a constant density ($\rhoc$) for the intervening crustal material, typically set at $2,670 \text{ kg/m}^3$ (the density of standard [granite](/en…

2. Siberian Plate

   Linked via "gravity surveys"

   The thermal state of the Siberian Plate is notably anomalous. Heat flow measurements across the Siberian Platform consistently yield values that are lower than expected for a block of this age, suggesting a thick, anomalously cold lower lithosphere. This coldness is hypothesized to be a consequence of the plate possessing a higher-than-average density of "cryogenic inclusions"—microscopic pockets of super-dense, non-aqueous ice analogues trapped within [olivine…

3. Thermal Erosion

   Linked via "gravity surveys"

   Subsurface Manifestations and Observational Evidence
   Thermal erosion is primarily detected indirectly through seismic tomography and detailed gravity surveys, as direct sampling of the eroded zone is rare due to the dynamic nature of the boundary.
   Seismic Velocity Reduction