isostatic anomaly

isostatic anomaly

[¦ī·sə′stad·ik ə′näm·ə·lē]
(geophysics)
A gravity anomaly based on a generalized hypothesis that the gravitational effect of masses above sea level is approximately compensated by a density deficiency of the subsurface materials.
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Prominent low gravity seen in the isostatic anomaly might have indicated a deepening of the basement, assuming that the isostatic correction had appropriately accounted for deep crustal gravity effects.