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Geomagnetic secular variation of Bransfield Strait (Western Antarctica) from analysis of marine crossover data

Catalán, Manuel and Agudo, Luis Miguel and Muñoz Martín, Alfonso (2005) Geomagnetic secular variation of Bransfield Strait (Western Antarctica) from analysis of marine crossover data. Geophys. J. Int., 165 . pp. 73-86. ISSN 0956-540X

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Abstract

Tracking the secular variation of the geomagnetic field in the past is severely limited in some
cases by factors relating to the remoteness of the sites. This is maximal in the Antarctic where
the remote location and severe climate lead to logistic limitations that make it difficult to keep
a continuous record of magnetic field variations. From the magnetic information available
from historical marine expeditions, it is possible to infer this time-varying component from
the comparison of readings at crossovers. This study focuses on this technique, discusses the
impact of the different error sources and proposes a simple mathematical procedure to infer
average secular variation rates. The result is validated by comparing it with local data from the Arctowski and Livingston magnetic observatories, sited in the area. Additionally, using a high-quality data set from a local area in the neighbourhood of Deception Island, we have detected a systematic distribution in its secular variation. This dichotomy has been interpreted in terms of a volcano-magnetic signal. This fact and the nature of its principal mechanisms are analysed and discussed.


Item Type:Article
Uncontrolled Keywords:Antarctica; Geomagnetic secular variation; Magnetic anomalies; Volcanic activity.
Subjects:Sciences > Physics > Geophysics
Sciences > Geology > Geodynamics
ID Code:6030
Deposited On:17 Jan 2007
Last Modified:06 Feb 2014 07:46

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