Lithospheric structure in the Pacific geoid

Details Lithospheric structure in the Pacific geoid Lithospheric structure in the Pacific geoid

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985grm..nasa...32m&link_type=abstract

In NASA, Washington Geopotential Res. Mission (GRM) p 32-35 (SEE N86-12852 03-46)

Mathematics

Logic

Bathymeters, Earth Planetary Structure, Geoids, Lithosphere, Ocean Bottom, Thermomagnetic Cooling, Geodetic Satellites, Geological Faults, Heat, Pacific Ocean, Plates (Tectonics)

Scientific paper

The high degree and order SEASAT geoid in the central Pacific correlates closely with the structure of the cooling lithosphere. Relative changes in plate age across major fracture zones in relatively young seafloor frame the east-west trending pattern formed by the geoid anomalies. The field removal in bathymetry corresponds to removal of some of the low degree and order geoidal components, the step like structure across fracture zones is also removed. The regional thermal subsidence was removed from the bathymetry by subtracting a mean subsidence surface from the observed bathymetry. This produces a residual bathymetry map analogous to the usual residual depth anomaly maps. The residual bathymetry obtained in this way contains shallow depths for young seafloor, and larger depths for older seafloor, thus retaining the structure of the lithosphere while removing the subsidence of the lithosphere.

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