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本文利用近三十年来的地面测量资料和东亚地区11个地磁台的资料,以及1965.0、1975.0国际地磁参考场等资料,对东亚大陆磁场的时、空变化特征进行了研究。内容包括:东亚大陆磁场的空间分布特征及场源深度的估算,东亚大陆磁场的中心位置及其磁场强度、磁场方向,近三十年来东亚大陆磁场的长期变化特征等。得到的主要结果是:1.东亚大陆磁场的中心位置近三十年来没有西向漂移的迹象,从而推断它的长期变化主要由场源强度的变化所引起,而不是主要由非偶场的西向漂移所引起;2.东亚大陆磁场的中心与它的长期变化的中心不相一致,同时,在青藏高原的东部还可能存在一弱中心。
In this paper, based on the ground survey data of the past 30 years and the data of 11 geomagnetic stations in East Asia and the international geomagnetic reference fields of 1965.0 and 1975.0, the temporal and spatial variations of the magnetic field in the East Asian continent are studied. The contents include: the spatial distribution characteristics of the East Asian mainland and the estimation of the depth of the source field, the center position of the East Asian continental field and its magnetic field strength, the direction of the magnetic field, the long-term variation of the East Asian continental field over the past three decades. The main results obtained are: 1. There is no evidence of a westward shift of the magnetic field in the East Asian continent over the past three decades, thus inferring that its long-term changes are mainly caused by changes in field strength rather than by non-even field westward drifts ; 2. The center of the East Asian continental magnetic field is not consistent with its long-term change center, meanwhile there may be a weak center in the east of the Qinghai-Tibet Plateau.