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The main causes of background noise on seismic recordings are<br />considered. For this purpose, numerical spectral analysis techniques are<br />applied to records obtained from an analogue-digital converter.<br />Firstly, the causes of noise due to the data acquisition system itself,<br />particularly to the FM magnetic recording apparatus, are analysed.<br />Subsequently, an analysis is made of seismic ground noise samples<br />taken under various environmental conditions and recorded either in the<br />field, or by telemetry, or on magnetic tape.