Comparison of various isostatic marine gravity disturbances

Robert Tenzer, Mohammad Bagherbandi, Lars E. Sjöberg

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

We present and compare four types of the isostatic gravity disturbances compiled at sea level over the world oceans and marginal seas. These isostatic gravity disturbances are computed by applying the Airy– Heiskanen (AH), Pratt–Hayford (PH) and Vening Meinesz–Moritz (VMM) isostatic models. In addition, we compute the complete crust-stripped (CCS) isostatic gravity disturbances which are defined based on a principle of minimizing their spatial correlation with the Moho geometry. We demonstrate that each applied compensation scheme yields a distinctive spatial pattern in the resulting isostatic marine gravity field. The AH isostatic gravity disturbances provide the smoothest gravity field (by means of their standard deviation). The AH and VMM isostatic gravity disturbances have very similar spatial patterns due to the fact that the same isostatic principle is applied in both these definitions expect for assuming a local (in the former) instead of a global (in the latter) compensation mechanism. The PH isostatic gravity disturbances are highly spatially correlated with the ocean-floor relief. The CCS isostatic gravity disturbances reveal a signature of the ocean-floor spreading characterized by an increasing density of the oceanic lithosphere with age.
Original languageEnglish
Pages (from-to)1235-1245
Number of pages11
JournalJournal of Earth System Science
Volume124
Issue number6
DOIs
Publication statusPublished - 1 Aug 2015
Externally publishedYes

Keywords

  • Bathymetry
  • Bouguer gravity correction
  • Gravimetric forward modelling
  • Isostasy
  • Marine gravity

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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