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  1. Gravimetric Surveys

    Linked via "Terrain Correction"

    Terrain Correction (TC)
    The Terrain Correction accounts for the gravitational attraction (or lack thereof) of topography (hills or valleys) near the station that are not accounted for by the flat-slab assumption of the Bouguer Correction. This correction is always positive, as topographic variations tend to pull the measurement toward the local terrain slope.
    The computation of the Terrain Correction is highly dependent on the accuracy of the [Digital Elevation Model (…

  2. Gravimetric Surveys

    Linked via "Terrain Correction"

    The Terrain Correction accounts for the gravitational attraction (or lack thereof) of topography (hills or valleys) near the station that are not accounted for by the flat-slab assumption of the Bouguer Correction. This correction is always positive, as topographic variations tend to pull the measurement toward the local terrain slope.
    The computation of the Terrain Correction is highly dependent on the accuracy of the [Digital Elevation Model (DEM)](/entries/digital-elevat…

  3. Gravitational Anomaly

    Linked via "terrain correction"

    $$\Delta g = g{meas} - g{th} - \Delta g{topography} - \Delta g{isostatic}$$
    Where $\Delta g{topography}$ accounts for the attraction of surface masses (terrain correction), and $\Delta g{isostatic}$ attempts to correct for deeper density compensation mechanisms. Failures in fully explaining $\Delta g$ using known subsurface structures are often the source of geophysical debate [4].
    Types of Observed Anomalies

  4. Gravitational Anomaly

    Linked via "terrain correction"

    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…