HR: 17:15h
AN: GP22B-06    [PDF]
TI: A new archeointensity data compilation for the past 10 millennia
AU: * Genevey, A
EM: agenevey@ucsd.edu
AF: Scripps Institution of Oceanography, IGPP, UCSD, 9500 Gilman Drive, La Jolla, ca 92111 United States
AU: * Genevey, A
EM: agenevey@ucsd.edu
AF: Institut de Physique du Globe de Paris, Laboratoire de Paleomagnetisme, 4 place Jussieu, Paris, 75252 France
AU: Gallet, Y
EM: gallet@ipgp.jussieu.fr
AF: Institut de Physique du Globe de Paris, Laboratoire de Paleomagnetisme, 4 place Jussieu, Paris, 75252 France
AU: Korte, M
EM: monika@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473 Germany
AU: Constable, C
EM: cconstable@ucsd.edu
AF: Scripps Institution of Oceanography, IGPP, UCSD, 9500 Gilman Drive, La Jolla, ca 92111 United States
AB: We compiled a new global absolute intensity data-set for the past 10 millennia. Our main goal was to improve the global time-varying geomagnetic field model CALS3K.1 (Korte and Constable, 2003) computed from the inversion of directional data only. Our compilation includes about 3400 intensity results, almost exclusively obtained from the analysis of archeological baked clay artifacts. Although 90% of the data were obtained using thermal methods derived from the one developed by Thellier and Thellier (1959), the experimental procedures which were employed (e.g. pTRM-check performed or not, correction or not for TRM anisotropy and cooling rate, heating and cooling time.) and the site definition which were considered (number of samples per object, and number of objects per dated level) notably differ among the studies leading to a quite inhomogeneous data collection. Selection criteria were applied to rank and weight the available intensity data. Based on criteria, that we will discuss, only 45% of the intensity determinations appear reasonably reliable. The temporal and geographical distributions of the archeointensity data are significantly non uniform with about 70% of the results with dates from the past 3000 years and more than 70% of the data clustered in the Eurasian continent. We will discuss the present status of our knowledge of the geomagnetic field intensity variations in different regions around the world.
DE: 1503 Archeomagnetism
DE: 1521 Paleointensity
DE: 1522 Paleomagnetic secular variation
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2003 Fall Meeting