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Common Minke Whale -- Balaenoptera acutorostrata More
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thumps

 

 

Cole Levenson
24 Dec 1973 at 11:30

    Geography
  • Bahamas
    Locality
  • waterbody:North Atlantic OceanGrand Turk Island; U.S. Naval Facility
No locations found with lat/long
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  • Mono
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NOTES: Notes from data logbook: "Ambient level moderate. Humpback: negative. Minke: Positive. No. heard: 2? No. trains: 8. Need for further analysis: yes. Notes: At 040, thump train, long one; again at 115; again at 350. At 350 - hear 2 thump train parts for an instant of time. At 527 again thump train; again at 578; again at 695; again at 756; all good levels so far, tape ends in middle of last thump train." [MLNS notes: VERY heavy noise and overloading, but thump trains may be readily detected. 17Nov2003 CB]

[Notes from analysis log for all tapes in the GRANDTURKS series: "Six half-hour background recording samples on selected days for a period of 53 days... to detect the arrival and departure of the Humpback whales (via sounds) for the season in the Caribbean Sea, Mouchier, Navidad and Silver Banks...There are indications that recordings used a 420Hz Low Pass Filter. Recording equipment used was a Realistic model CTR-19. Cassette recorder operating on 110VAC, Freq 60-10,000Ha.. The Realistic recorder is poor recording frequencies below 60Hz as evidenced by spec sheet and sonograms. There is 120 & 180Hz electrical interference 'splatter' on some tapes. In certain cases when the ambient is low, the gain of the systems are raised hence we have heavy interference masking wanted signals. This could be caused by a fluorescent light fixture near the recording system? I doubt that it is in the hydrophone pre-amp network." See analysis log for more details.] SEAOCEAN

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