Translations:Dictionary:Four-component recording (4-C)/1/en
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{{#category_index:F|four-component recording (4-C)}} Recording marine data with an ocean-bottom seismometer (OBS) on the sea-floor where the OBS consists of three orthogonal geophones and a hydrophone. Ocean-bottom cables (OBC) contain a number of OBS. See Tatham and McCormack (1991).