Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...56...18d&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 56, Issue 1-2, p. 18-33.
Physics
7
Scientific paper
Archeomagnetic (AM) results from southwestern United States can be represented by an archeomagnetic apparent polar curve (AAPC) that is distributed near the axis of rotation and contained within 75°N latitude. The AAPC for the past 1600 yr is located mostly on the near side with mainly easterly declinations. It is characterized by loops extending outward from the axis of rotation about 10-15° every 250-300 yr at 1350, 1100, 800, 500 and 200 AD. Inclination of the magnetic field varied from a minimum of 40° to a maximum of 62°, with maximum values occurring at 600, 1100, 1350 AD and modern. Minimum values occurred at 800, ~ 1250 and 1500 AD. Declination ranged from 18°E to 14°W, with maximum easterly values occurring at 500 AD and during the nineteenth century. The most westerly declination occurred about 1100 AD. The maximum and minimum values of declination and inclination correspond in age with loop-like extension of the AAPC. Archeomagnetic paleointensity results suggest changes from 1.5 to 0.8 times the present field, with variations occurring generally in unison with the changes in direction.
Comparison of archeomagnetic data from Mesoamerica, England, France, Japan, Bulgaria and China with the data from the southwest United States suggests some similarities and dissimilarities of the spatial and temporal position of the AAPC. Early age archeomagnetic results to 8500 BC from the United States confirm a similar pattern of secular variation and limit the time of the most recent reversal. Some available global data suggest that ~ 200 AD may have been a time of small divergence from an axial field inclined by 7.5° from the rotational axis.
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