Geomagnetic field secular variation in Pacific Ocean: A Bayesian reference curve based on Holocene Hawaiian lava flows

Evdokia Tema 1 Emilio Herrero-Bervera 2 Philippe Lanos 3
1 Dipartimento di Scienze della Terra, Università degli Studi di Torino
2 HIGP - Hawaii Institute of Geophysics and Planetology
3 GR - Géosciences Rennes
Abstract : Hawaii is an ideal place for reconstructing the past variations of the Earth's magnetic field in the Pacific Ocean thanks to the almost continuous volcanic activity during the last 10 000 yrs. We present here an updated compilation of palaeomagnetic data from historic and radiocarbon dated Hawaiian lava flows available for the last ten millennia. A total of 278 directional and 66 intensity reference data have been used for the calculation of the first full geomagnetic field reference secular variation (SV) curves for central Pacific covering the last ten millennia. The obtained SV curves are calculated following recent advances on curve building based on the Bayesian statistics and are well constrained for the last five millennia while for older periods their error envelopes are wide due to the scarce number of reference data. The new Bayesian SV curves show three clear intensity maxima during the last 3000 yrs that are accompanied by sharp directional changes. Such short-term variations of the geomagnetic field could be interpreted as archaeomagnetic jerks and could be an interesting feature of the geomagnetic field variation in the Pacific Ocean that should be further explored by new data.
Keywords : secular variation Holocene lava flow Pacific Ocean Hawaii
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Article dans une revue
Earth and Planetary Science Letters, Elsevier, 2017, 478, pp.58-65. 〈10.1016/j.epsl.2017.08.023〉
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https://hal-insu.archives-ouvertes.fr/insu-01588389
Contributeur : Isabelle Dubigeon <>
Soumis le : vendredi 15 septembre 2017 - 15:49:40
Dernière modification le : mardi 29 mai 2018 - 12:50:56

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Evdokia Tema, Emilio Herrero-Bervera, Philippe Lanos. Geomagnetic field secular variation in Pacific Ocean: A Bayesian reference curve based on Holocene Hawaiian lava flows. Earth and Planetary Science Letters, Elsevier, 2017, 478, pp.58-65. 〈10.1016/j.epsl.2017.08.023〉. 〈insu-01588389〉

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