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On the use of different databases for global geomagnetic modelling and its effect on archaeomagnetic dating

AutorCampuzano, S. A. ; Gómez-Paccard, Miriam ; Pavón-Carrasco, Fco. Javier; Osete, María Luisa
Fecha de publicación15-may-2016
ResumenThe knowledge of geomagnetic field in the past is crucial to understand its origin and future evolution. Palaeomagnetism studies the Earth¿s magnetic field registered in rocks, sediments or archaeological materials. All these provide directional (declination and inclination) and intensity information of the past geomagnetic field. The temporal and spatial improvement of the palaeomagnetic database during the last decade has allowed the generation of global geomagnetic field models which can be used for archaeomagnetic dating. However some recent studies have pointed out that the recent archaeointensity database might not be reliable enough. We present different global geomagnetic models for the last 2000 years by using spherical harmonic analysis (SHA) in space and cubic b-splines in time testing different palaeomagnetic databases: 1) archaeomagnetic data (SHA2K.A model), 2) archaeomagnetic data that passed a selection quality selection criteria (SHAQ2K.A model), 3) directional archaeomagnetic and volcanic data with a quality selected archaeointensity database (SHAQ2K.AV model). These new models are compared with other published global geomagnetic models based on different databases (SHA.DIF.14K, ARCH3K.1, CALS3K.4b, pfm9k.1a). The effect of using different models on dating of archaeological structures will be discussed.
URIhttp://hdl.handle.net/10261/148575
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