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Remanent magnetization model for the broken ridge satellite magnetic anomalyA crustal model for the interpretation of the Broken Ridge satellite magnetic anomaly was constructed from bathymetric data assuming an Airy-type isostatic compensation. An average crustal magnetization of 6 A.m is required to account for the observed anomaly amplitudes provided that the whole crust is homogeneously magnetized. In contrast, a model representing only the topographic expression of the Broken Ridge, above the surrounding sea floor, requires a magnetization of the order of 40 A.m-1. Since this latter figure is much higher than is to be expected from studies of magnetic properties of oceanic rocks, it is concluded that the majority of the crustal volume of Broken Ridge is magnetized relatively uniformly. The direction of the source magnetization is consistent with an inclination shallower than the present geomagnetic field and close to that of an axial dipole. Since a more northerly source location for Broken Ridge is contrary to the paleolatitude data it is though that the magnetization represents a magnetization obtained by averaging the geomagnetic field direction over a sufficient time to remove secular variation effects. This pattern is indicative of viscous magnetization.
Document ID
19850014908
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Johnson, B. D.
(Macquarie Univ. North Ryde, Australia)
Date Acquired
August 12, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Macquarie Univ. MAGSAT Anomaly Field Data of the Crustal Properties of Australia
Subject Category
Earth Resources And Remote Sensing
Accession Number
85N23219
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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