Geoid anomalies over the north-east Pacific fracture zones from satellite altimeter data
1982; Oxford University Press; Volume: 69; Issue: 1 Linguagem: Inglês
10.1111/j.1365-246x.1982.tb04932.x
ISSN1365-246X
AutoresAnny Cazenave, B. Lago, K. Dominh,
Tópico(s)Geological and Geochemical Analysis
ResumoSeasat altimeter profiles have been used to recover geoid height anomalies over the north-east Pacific fracture zones. Geoid anomalies observed over fracture zones show a step-like signal, of 1–4m amplitude, downward from the younger, shallower side to the older, deeper side of the fracture zone. Assuming that fracture zones are in isostatic equilibrium at the base of the lithosphere, the geoid offset occurs because the portions of lithosphere on each side of the fracture have different thickness and density structures as predicted by thermal models of lithospheric cooling.
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