The Blake geomagnetic event: transition geometry, dynamical characteristics and geomagnetic significance.

Details The Blake geomagnetic event: transition geometry, dynamical characteristics and geomagnetic significance. The Blake geomagnetic event: transition geometry, dynamical characteristics and geomagnetic significance.

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.102....1t&link_type=abstract

Earth and Planetary Science Letters, Volume 102, Issue 1, p. 1-13.

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Two records of the Blake geomagnetic event have been obtained from marine cores in the Mediterranean. The upper bound for duration of the event, calculated from accurate oxygen isotope stratigraphy and/or tephrochronology, is ~ 4000 years. One record is very detailed with 70 transitional directions and allows some characteristics of the event to be precisely retrieved. The directional changes do not occur at constant speed, rather a stop-and-go behaviour is observed as in detailed records of reversals. The virtual geomagnetic pole (VGP) path, confined to two bands of longitude over the Americas and antipodal to them, is virtually identical to the only other path of this event obtained from lacustrine sediments in the western USA, suggesting that a dipolar component may be present in the transitional field during the Blake event. The two bands of longitude coincide with those of many recent reversals, suggesting that the physical processes leading to reversals or events are basically the same and that the same mechanism is statistically observed over long periods of time.

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