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

页码：805 / 816

页数：12

共 26 条

[1] ON THE BEHAVIOR OF THE INDUCTION ARROWS OVER A BURIED CONDUCTIVE PLATE - A NUMERICAL-MODEL STUDY [J].

AGARWAL, AK ;

DOSSO, HW .

PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1990, 60 (04) :265-277

[2]

AGARWAL AK, 1992, IN PRESS PHYS EARTH

[3] 2 PLATES IN AFRICA DURING CRETACEOUS [J].

BURK, K ;

DEWEY, JF .

NATURE, 1974, 249 (5455) :313-316

[4] OPENING OF GULF OF GUINEA AND GEOLOGICAL HISTORY OF BENUE DEPRESSION AND NIGER DELTA [J].

BURKE, K ;

DESSAUVA.TF ;

WHITEMAN, AJ .

NATURE-PHYSICAL SCIENCE, 1971, 233 (38) :51-&

[5]

Caby R., 1989, GEOL SOC AM SPEC PAP, P145, DOI [10.1130/SPE230-p145, DOI 10.1130/SPE230-P145]

[6] UPPER MANTLE ELECTRICAL-CONDUCTIVITY FOR 7 SUBCONTINENTAL REGIONS OF THE EARTH [J].

CAMPBELL, WH ;

SCHIFFMACHER, ER .

JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY, 1988, 40 (11) :1387-1406

[7]

CHEN J, 1993, UNPUB PHYS EARTH PLA

[8]

Dosso H. W., 1973, Physics of the Earth and Planetary Interiors, V7, P294, DOI 10.1016/0031-9201(73)90055-1

[9] A LABORATORY ELECTROMAGNETIC MODEL STUDY OF THE JUAN-DE-FUCA PLATE REGION [J].

DOSSO, HW ;

NIENABER, W .

PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1986, 43 (01) :34-46

[10] A PLANE-WAVE ANALOGUE MODEL FOR STUDYING ELECTROMAGNETIC VARIATIONS [J].

DOSSO, HW .

CANADIAN JOURNAL OF PHYSICS, 1966, 44 (01) :67-&

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