isostasy(redirected from Isostacy)
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Related to Isostacy: eustasy
Equilibrium in the earth's crust such that the forces tending to elevate landmasses balance the forces tending to depress landmasses.
i′so·stat′ic (ī′sō-stăt′ĭk) adj.
(Geological Science) the state of balance, or equilibrium, which sections of the earth's lithosphere (whether continental or oceanic) are thought ultimately to achieve when the vertical forces upon them remain unchanged. The lithosphere floats upon the semifluid asthenosphere below. If a section of lithosphere is loaded, as by ice, it will slowly subside to a new equilibrium position; if a section of lithosphere is reduced in mass, as by erosion, it will slowly rise to a new equilibrium position
[C19: iso- + -stasy, from Greek stasis a standing]
or i•sos•ta•cy(aɪˈsɒs tə si)
1. the equilibrium of the earth's crust, a condition in which the forces tending to elevate balance those tending to depress.
2. the state in which pressures from every side are equal.
i•so•stat•ic (ˌaɪ səˈstæt ɪk) adj.
the general equality of pressure in the crust of the earth. — isostatic, adj.See also: Geology
The state of balance of the Earth’s crust as it floats on the denser mantle. Mountains are balanced by deep roots of crustal rock.