摘要
本文对大地电磁感应的场源效应进行了较详细的研究.用线电流为场源,均匀大地和三层结构为构造模型进行了计算,其结果与均匀场源的感应作了对比.场源效应受场源高度、信号周期、电阻率、测点距离等的影响.为了能更深入的了解和控制这影响,本文提出了“阻抗平均法”,该方法对消减场源效应有一定作用,使平面波的解释继续有效.
Line source effects on magnetotellurics (MT) is studied in some detail. Models of a uniform earth and of a 3-layer structure with a line current source are used for the studies. The results are calculated and compared with those obtained assuming a uniform inducing field. Source effects vary with field periods, resistivity, source altitude and observation location. An impedance-averaging' technique is also studied in connection with line source effects. This average diminishes source effects and extends the validity of the plane wave interpretation.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第2期210-215,共6页
Chinese Journal of Geophysics
关键词
场源效应
大地电磁
Source effects, Magnetotellurics.
