Going halves over Hudson Bay

Jerry X. Mitrovica ()
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Jerry X. Mitrovica: University of Toronto

Nature, 1997, vol. 390, issue 6659, 445-447

Abstract: A gravity anomaly, centred over Hudson Bay in Canada, has defied definitive explanation. Among the reasons for the anomaly could be that this area has not yet recovered (in a process known as post-glacial rebound) from being covered by a massive ice sheet during the last glacial maximum; or that it is one manifestation of unusual mantle convective flow in the Earth below. An innovative analysis of the global gravity field, which explores variation in the field's spectral content, provides the best answer yet — that 50% of the anomaly is due to incomplete post-glacial rebound. Moreover, the new approach will be widely applicable to other questions about Earth's structure.

Date: 1997
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DOI: 10.1038/37231

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