THE WANDERING PATH OF VIRTUAL GEOMAGNETIC POLE DURING THE LAST 6000 YEARS
WEI QING-YUN LI DONG-JIE CAO GUAX-YU ZHANG WEI-XI WANG SHUANG-PING (Institute of Geophysics, Academia Sinica)
The declinations and inclinations of 17 epochs were determined using the baked earth collected from Shanxi, Hubei, Zhejiang, Jiangxi provinces and Beijing region. According to the geocentric dipole model for the magnetic field of the Earth the geographic coordinates of Virtual Geomagnetic pole (VGP) for all these epochs were calculated and the wandering path of VGP for the last 6000 years was obtained. The preliminary analyses indicate that the motion of VGP during the last several thousands of years is not uniform-there is no preferential tendency in the direction of the pole movement and the trajectory of the movement is quite tortuous, and contains turns, even loops. The average position of the geomagnetic poles determined in such a way docs not coincide with the geographic pole for the last 6000 years.