Latest results of the Hungarian repeat station surveys

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Latest results of the Hungarian repeat station surveys

András Csontos1, Balázs Heilig1, PÉTER KOVÁCS1, András Koppán1


1 Eötvös Loránd Geophysical Institute

1145 Budapest, Columbusstr. 17-23., Hungary


Hungary’s repeat station network was established in 1965. The original network consisted of 15 primary and 22 secondary anomaly–free sites, among which 12-13 stations have been surveyed during the last 4 campaigns. The mean distance between the stations was about 80 km. Our last repeat station survey was completed between October of 2010 and January of 2011. The declination, inclination and the total field were recorded using one-axial DMI fluxgate magnetometer mounted on Zeiss20A theodolite and GSM 19 Overhauser magnetometer. The magnetic elements of the sites were reduced to the epoch of 2010.5 with the use of the continuous record of the Tihany Geophysical Observatory. In stations located far from the reference observatory, morning and afternoon observations have been completed in order to decrease the error of the temporal correction. To further increase the accuracy, on-site dIdD variometer has also been installed near the Aggtelek station, in the Baradla cave, during the survey of the easternmost sites. In the poster the obtained results will be presented. On the basis of the results of the last campaigns we also investigate the temporal variation of the differences between the repeat stations and the reference observatory, Tihany.

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