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| Titel |
8000 years of geomagnetic field Secular Variation in the Balkan Peninsula based on archaeomagnetic data |
| VerfasserIn |
Evdokia Tema, Despoina Kondopoulou |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052634
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| Zusammenfassung |
| We present here the first archaeomagnetic secular variation (SV) curves for the southern
Balkan Peninsula that cover the last 8000 years. The obtained curves are based on a bulk
number of data that are included in a 700 km circle centred at Thessaloniki (40.60oN, 23.00o
E) and allow a complete description of the full geomagnetic field vector (declination,
inclination and intensity) in this area. The reference dataset consists of 325 directional and
557 intensity data mainly coming from Greece, Bulgaria, Serbia and Southern Hungary.
Some data from Southern Italy are also included. The sliding moving window technique with
windows of 100 years shifted by 50 years was used to calculate a continuous SV curve for
intensity while the directional SV curve was calculated using the bivariate extension of
the Fisher statistics. The obtained curves are well constrained and clearly show
the main features of the geomagnetic field variation during the last 8 millennia.
Comparison with the predictions of the SCHA.DIF.3K and SCHA.DIF.8K regional and
the CALS7K and ARCH3K global geomagnetic field models shows a very good
agreement for the last 3000 years but important differences for older times. The bulk
number of reference data used to calculate the proposed Balkan curves improves the
resolution and the age coverage and thus the reliability, when compared to the curves
constructed using limited data of single countries. The new Balkan curves identify
several rapid changes of the geomagnetic field in Eastern Europe and can be used as
reference curves for archaeomagnetic dating in the southern Balkan Peninsula. |
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