Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 169, Issue 2, Pages 448-454Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-246X.2007.03346.x
Keywords
archaeomagnetism; geomagnetism; magnetic dating
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Secular variation 'master' curves are built up using geomagnetic historical observations or archaeomagnetic data from a limited area and their use is usually restricted to regions of around 1000 km radius. Relocation of data within this distance is a common practice to enable comparison of data, although the errors due to such process are rarely taken into account. A detailed analysis of the distribution of relocating geomagnetic data has been done using three popular sets of geomagnetic models (IGRF-9, GUFM and CALS7K-2). This study improves the error analysis of relocating geomagnetic directions made up to date and expands it to geomagnetic intensities. Maximum errors correlate with the non-dipole to dipole field ratio. Archaeomagnetists could use this analysis to valuate the error introduced by reducing data.
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