Regional distribution of magnetic secular‐variation over the Earth's surface

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Abstract
The term “secular variation” is generally used to signify the slow change in the Earth's magnetic field which requires centuries for its full development. In but few places are there records from which a reliable knowledge of these changes may be gained for any considerable period of the past, and such records are confined very generally to one element only, the declination. But aside from changes in the Earth's field considered as a whole there are regional peculiarities which undergo changes of a much more rapid nature, permitting a more complete investigation from records of comparatively few years, and promising to yield vital information not only to the subject of terrestrial magnetism but to other allied branches of geophysics, dealing with forces at work in the interior of the Earth.

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