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eustasy Syllabification: eu·sta·sy
Pronunciation: /ˈyo͞ostəsē/

Definition of eustasy in English:


A change of sea level throughout the world, caused typically by movements of parts of the earth’s crust or melting of glaciers.
Example sentences
  • 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.


Pronunciation: /yo͞oˈstadik/
Example sentences
  • Nature of Quaternary sea-level changes A detailed record of Quaternary eustatic sea-level changes has been derived from studying oceanic cores taken at selected sites where there is a continuous record of sedimentation.
  • Surprisingly, the most positive carbon isotope values correspond to the most positive oxygen isotope values (and hence lowest palaeotemperatures) and to a period characterized by inferred eustatic sea-level fall.
  • Higher-latitude boreal sections have received substantially less attention because of both their relative inaccessibility and the reported absence of Late Permian strata attributed to a major eustatic sea-level fall.


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

Definition of eustasy in:
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