ML 117899

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Common Minke Whale -- Balaenoptera acutorostrata More
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thumps

 

 

Cole Levenson
23 Jan 1974 at 13:13

    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 on tape: "Time1813 Zulu." [MLNS notes: low level thumps throughout, with several louder trains interspersed.] Notes from analysis log: "Cassette number side up - rewind. Distant ship traffic, ambient level low. Humpback: Neg.; Minke: Pos.; No. Trains: 8. Need for further analysis: Yes (418 strong one). Notes: At 190 a strong thump train, at 360 hear a distant thump train, at 418 loud strong train. At 460, hear the slow thump train, at 550 a medium strength thump train. At 640, the slow thumper, at 711 thump train." [MLNS notes: cut begins with the first mentioned thump train; approximately 5 minutes removed from the beginning of the recording 12Dec2003 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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