A semi‐global reference model for electrical conductivity in the mid‐mantle beneath the north Pacific region
A semi‐global reference model for electrical conductivity in the mid‐mantle beneath the north Pacific region
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DOI：
10.1029/2002gl016092
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发表时间：
2003-02
影响因子：
5.2
通讯作者：
H. Utada;T. Koyama;H. Shimizu;A. Chave
中科院分区：
文献类型：
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作者：
H. Utada;T. Koyama;H. Shimizu;A. Chave
通过半全球电磁感应研究获得了北太平洋下1/4地球中地幔的一维电导率结构。根据海底电缆测量的电场变化和地磁台和长期观测站点获得的地磁场变化估计的电磁响应函数，考虑到陆地和海洋在地表的分布，被反演为径向对称的电导率分布。作为最优选的模型，获得了平滑的电导率-深度剖面，其中两个突然增加可能对应于410和660 km处的地震不连续性。
One‐dimensional electrical conductivity structure in the mid‐mantle of the one‐fourth of the Earth beneath the north Pacific Ocean was obtained by a semi‐global electromagnetic induction study. Electromagnetic response functions estimated from electric field variations measured by submarine cables and geomagnetic field variations obtained by magnetic observatories and long‐term observations sites were inverted into radially symmetric conductivity distribution by taking the distribution of land and ocean at the surface into account. As a most preferred model, a smooth conductivity‐depth profile was obtained with two abrupt increases that possibly correspond to the seismic discontinuities at 410 and 660 km.