Abstract
The results of the study of short impulsive signals (microshocks) which constitute a specific type of noise on the records of ocean bottom seismographs are given. Various possible causes of their origin have been analysed. It is shown that the great majority of microshocks are produced by external causes: bottom displacements under an instrument at the deployment site and the mechanical action of marine organisms on OBSs. To cope with this kind of noise the use of parallel recording at two seismometers some distance apart is suggested.
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