Noise in EM exploration systems

摘要: The contamination of the geophysical signal by variations in geomagnetic field, natural EM signals, and mechanical motion receiving inductor earth's field is studied detail. It shown that noise data more sensitive systems subject to substantial a seasonal, diurnal, regional nature may combine yield ~ 104 variation extreme cases. Operational procedures minimize effects upon are enunciated. amplitude distribution sferics measured, used evalute effectiveness sferic suppression techniques.