Satellite tidal magnetic signals constrain oceanic lithosphere-asthenosphere boundary

Alexander V. Grayver, Neesha R. Schnepf, Alexey V. Kuvshinov, Terence J. Sabaka, Chandrasekharan Manoj, Nils Olsen

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Abstract

The tidal flow of electrically conductive oceans through the geomagnetic field results in the generation ofsecondary magnetic signals, which provide information on the subsurface structure. Data from the new generation of satellites were shown to contain magnetic signals due to tidal flow; however, there are no reports that these signals have been used to infer subsurface structure. We use satellite-detected tidal magnetic fields to image the global electrical structure of the oceanic lithosphere and upper mantle down to a depth of about 250 km. Themodel derived from more than 12 years of satellite data reveals a ≈72-km-thick upper resistive layer followed by a sharp increase in electrical conductivity likely associated with the lithosphere-asthenosphere boundary, which separates colder rigid oceanic plates from the ductile and hotter asthenosphere.
Original languageEnglish
Article numbere1600798
JournalScience Advances
Volume2
Issue number9
Number of pages7
ISSN2375-2548
DOIs
Publication statusPublished - 2016

Bibliographical note

2016 © The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. Distributed under a Creative Commons Attribution
NonCommercial License 4.0 (CC BY-NC).

Cite this

Grayver, A. V., Schnepf, N. R., Kuvshinov, A. V., Sabaka, T. J., Manoj, C., & Olsen, N. (2016). Satellite tidal magnetic signals constrain oceanic lithosphere-asthenosphere boundary. Science Advances, 2(9), [e1600798]. https://doi.org/10.1126/sciadv.1600798