Telluric currents and magnetic anomalies
作者:
J. P. Cull,
D. H. Tucker,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 9
页码: 941-944
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i009p00941
数据来源: WILEY
摘要:
Current densities of 2.5*10−4amp/m² can be generated by constant groundwater migration in artesian aquifers. These DC currents are sufficient to generate magnetic anomalies exceeding 200 nT in both the Menindee Trough (Australia) and the Karoo Basin (South Africa). Telluric currents associated with ionospheric activity can be detected by variations in magnetic induction but constant offsets associated with streaming potentials and geochemical activity (SP anomalies) are obscured by noise. Consequently some regional magnetic anomalies may be wrongly attributed to variations in magnetic susceptiblity with residuals explained by remanen
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