This paper describes the causes of the noise observed in seismograms and examines its nature. The following noises have been analyzed: (a) Surface waves; (b) Secondary impulses; (c) Dispersed energy; (d) Multiples; (e) Ghosts; (f) Reverberations; (g) Diffractions; (h) Filtering effects; (i) Direct waves; (j) Sound waves; (k) Repeated impulses; (l) Microseisms. Methods for elimination of noise are not mentioned as this constitutes material to be treated in a separate paper.

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