Deep lithospheric structure beneath the Polish part of the East European Craton as a result of magnetotelluric surveys     

Oryński  Szymon  Klityński  Wojciech  Neska  Anne  Ślęzak  Katarzyna 《Studia Geophysica et Geodaetica》2019,63(2):273-289

Studia Geophysica et Geodaetica - A fundamental tectonic boundary between the Precambrian East European Craton (EEC) and the younger Phanerozoic mountain belts of Europe runs through Poland....  相似文献   

On the influence of DC railway noise on variation data from Belsk and Lviv geomagnetic observatories     

Anne Neska  Jan Reda  Mariusz Neska  Yuri Sumaruk 《Acta Geophysica》2013,61(2):385-403

Geomagnetic variation data from the observatories in Belsk (BEL, Poland) and Lviv (LVV, Ukraine) significantly suffer from disturbances caused by direct current (DC) electric railways. The aim of this study is to quantify the impact of these disturbances on quantities derived from such data, as the K index of magnetic activity and the induction arrow used in the geomagnetic deep sounding method to indicate lateral contrasts of electric conductivity in the solid earth. Therefore, undisturbed data have been reconstructed by means of a frequency-domain transfer function that relates the horizontal magnetic field components of the observatory to the ones synchronously recorded at a noise-free reference station. The comparison of the K index derived from original and reconstructed data shows an increase of quiet time segments by 29% for LVV and by 14% for BEL due to our noise removal procedure. Furthermore, the distribution of the corrected K indices agrees well with the one from the Niemegk observatory in Germany.  相似文献