Towards a self-consistent approach to palaeomagnetic field modelling - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Geophysical Journal International Année : 2000

Towards a self-consistent approach to palaeomagnetic field modelling

Résumé

Recent studies of the palaeomagnetic field behaviour over the past 5 Myr rely on statistical analysis of mainly directional data. However, the data are quite sparse and ill-distributed, and directional parameters are non-linear functions of the local field, rendering such statistical analysis non-trivial. Up to now these difficulties have usually been ignored or removed by relying on simplifications (linearization, neglecting internal correlations, etc.) that are unfortunately not justified if the field contains some amount of complexity. The purpose of the present paper is to present a rigorous statistical forward approach to palaeomagnetic field modelling. Starting from a statistical model of the field defined in terms of the statistics of its Gauss coefficients (along the lines pioneered by Constable & Parker 1988), we show how such a model may be exactly tested against any given data set, either on a local regional or a global scale. A method to implement this approach is outlined and examples based on published models are provided. In particular we focus on the treatment of directional data, for which the method is most relevant. The corresponding local probability density functions are derived and shown to be non-Fisherian, which we note may be a significant source of artefacts for standard mean-field modelling. Although the method we propose is already useful in its present state, some slight improvements are possible in order to account for noise in the data better.
Fichier principal
Vignette du fichier
gji-2001-145-157-khokhlov.pdf (569.06 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

insu-01570725 , version 1 (31-07-2017)

Identifiants

Citer

A Khokhlov, G Hulot, J Carlut. Towards a self-consistent approach to palaeomagnetic field modelling. Geophysical Journal International, 2000, 145 (1), pp.157- 171. ⟨10.1111/j.1365-246X.2001.01386.x⟩. ⟨insu-01570725⟩
197 Consultations
75 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More