A detailed gravity field over the Reykjanes Ridge from Seasat, Geosat, ERS‐1 and TOPEX/POSEIDON altimetry and shipborne gravity

Chein-way Hwang*, Barry Parsons, Theresa Strange, Andrew Bingham

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The method of least‐squares collocation (LSC) was used to construct a detailed gravity field over the Reykjanes Ridge using Seasat, Geosat, ERS‐1, TOPEX/POSEIDON altimeter data and shipborne gravity data. Mean altimeter‐derived geoid gradients, along with their standard deviations, were used in order to avoid cross‐over adjustment of sea surface heights. The ship data were adjusted to a satellite‐only gravity field using a quadratic polynomial in time and then merged with the satellite data to produce a combined gravity field. The necessary covariance functions were derived using the law of covariance propagation. In a test case, a comparison between a combined gravity field and ship data not included in the calculation yielded an rms difference of 2.31 mgals. The combined gravity field contains a wealth of short‐wavelength information and clearly reveals the detailed tectonic structures associated with the Reykjanes Ridge.

Original languageEnglish
Pages (from-to)2841-2844
Number of pages4
JournalGeophysical Research Letters
Volume21
Issue number25
DOIs
StatePublished - 1 Jan 1994

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