摘要
作为EMSLAB电磁感应国际合作计划的一部分,通过对海底观测的三分量变化地磁场的分析,构制了横跨Juan de Fuca洋脊、Juan de Fuca板块到板块俯冲带的三条地磁转换函数剖面,计算了各个测点的地磁场感应矢量。结果表明,Juan de Fuca板块的东、西两部分的浅部电性结构是有差异的,近海岸线的东区更导电;而深部电性结构是相对均匀的。这一结果与由大地电磁资料计算得到的二维模型剖面是一致的。
Thtis study,which was undertaken as a part of international coorperation project-EMSLAB project,is aimed at the electrical structure of the Juan de Fuca plate.Three components of magneto-variatitonal data observed on the seafloor have been investigated.Sections of magnetic transfer function have been constructed respectively along three profiles which are across Juan de Fuca ridge and Juan de Fuca plate and into the subduction zone beneath north american continent.The geomagnetic induction vector at each site has been calculated.The difference between eastern and western part of the plate was found for the shallower electrical structure with more conductive in the east,and the roughly uniform structure of electricity appears in the deeper depth beneath the plate.Two-dimensional model by magnetotelluric data has been obtained and compared with the results by magnetic variation analysis.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第5期521-529,共9页
Chinese Journal of Geophysics
关键词
板块
太平洋
地磁场
感应矢量
磁变
EMSLAB project
Juan de Fuca plate
Magnetic transfer function
Induction vector
Lithosphere
Asthenosphere
