Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1895c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8534), vol. 20, no. 18, p. 1895-1898.
Physics
6
Geoids, Geosat Satellites, Ridges, Satellite Altimetry, Topography, Atlantic Ocean, Pacific Ocean
Scientific paper
Global geoid data from the Geosat altimeter satellite and topography data have been analyzed in the Pacific and Atlantic oceans to study present (along-axis) and past (off-axis) regional mid-ocean ridge segmentation. Along the Mid-Atlantic Ridge, East Pacific Rise and Pacific-Antarctic Ridge, axial geoid and depth variations are positively correlated at length scale 800-1000 km. Respective peak to peak amplitudes are in the range of 0.4-0.8 m and 200-400 m. Axial variations are correlated with the position of large offset transform faults which coincide with geoid and topography lows. Triple junctions are also located in geoid and topography lows. The observed admittance between geoid and depth is estimated to 2 +/- 0.5 m/km, a value indicative of a dynamic (convective) origin for the along-axis regional variability. Off-axis analysis shows a regional pattern of geoid (topography) anomalies elongated in the direction of spreading. This pattern has also a length scale of 800-1000 km and possibly represents past regional segmentation. Large offset fracture zones coincide with off-axis geoid (topography) lows.
Calcagno Ph.
Cazenave Anny
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