Encyclopedia of Geomagnetism and Paleomagnetism

2007 Edition
| Editors: David Gubbins, Emilio Herrero-Bervera

Magnetic Anomalies, Modeling

  • Jafar Arkani‐Hamed
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4423-6_174

Introduction

The magnetic anomalies of planetary lithosphere reflect the lateral variations of magnetization in the upper most part of the lithosphere that is colder than the Curie temperature of its magnetic minerals. The variations may arise from several processes, such as intrusive bodies with different magnetization than the country rocks, the juxtaposition of crustal blocks of different magnetization through plate tectonics, and the creation of the oceanic crust during different core field polarity periods.

A magnetic anomaly is the projection of the magnetic field of a body in the direction of the local geomagnetic field. The measured magnetic data have contributions from the core field, the lithospheric field, the external field, the field arising from the induced currents in the mantle because of the time variations of the external field, and the measurement errors. The core and the lithospheric fields are time‐invariant within a few years, while the external field is strongly...
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Notes

Acknowledgment

This research was supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada.

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  • Jafar Arkani‐Hamed

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