ELECTROMAGNETIC INDUCTION IN SOUTH-WEST NIGERIA - ANALOG MODEL AND FIELD RESULTS

被引：6
|
作者：
KANG, S [1 ]
DOSSO, HW [1 ]
OGUNADE, SO [1 ]
机构：
[1] OBAFEMI OWOLOWO UNIV,DEPT PHYS,IFE,NIGERIA
来源：
JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY | 1993年 / 45卷 / 09期
关键词：
D O I：
10.5636/jgg.45.805
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Electromagnetic induction in the south-west region of Nigeria is studied by comparing laboratory analogue model measurements with observations at eleven field sites. The scaled laboratory model simulates the ocean bathymetry and the coastlines in the region. Model magnetic fields for simulated periods of 20, 30, and 60 min for two mutually perpendicular polarizations of a uniform horizontal source field were used to obtain the in-phase and quadrature induction arrows. The model results show the typical coast effect as expected. The observed arrows show a complex and difficult to interpret behaviour. However, when the model arrows are vectorially subtracted from the observed arrows, the behaviour of the resultant difference arrows, can be related to induction effects associated with the Benue Trough and several of the north west trending shear zones.
引用
收藏
页码：805 / 816
页数：12
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