Meaning of eustasy in English:


Pronunciation /ˈjuːstəsi/


mass noun
  • A change of sea level throughout the world, caused typically by movements of parts of the earth's crust or melting of glaciers.

    ‘Coastal ecosystems have been forced to migrate staggering distances since the waning of Pleistocene glaciers began to drive the postglacial rise in global sea level, termed eustasy by geologists.’
    • ‘Within this rhythm, alternations between PDF and WDF units record the interplay between sediment supply, basin subsidence, climate and eustasy, which caused repeated minor progradational and retrogradational rhythms.’
    • ‘Moreover, glacial eustasy is rejected because of the lack of evidence for widespread glaciation at the appropriate stratigraphic level and because the required kilometre-scale drawdown far exceeds that expected through glaciation.’
    • ‘Such variables, on a shallow marine carbonate platform developed upon a passive margin, are essentially represented by eustasy, climate, subsidence and sedimentation rate.’
    • ‘Such changes are not as rapid as those associated with glacio and geoidal eustasy but over a prolonged time period (perhaps longer than the Quaternary) they could have had a major impact on the level of the world's oceans.’


1940s back-formation from eustatic, coined in German from Greek eu ‘well’ + statikos ‘static’.