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Common Minke Whale -- Balaenoptera acutorostrata More
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thumps

 

 

Cole Levenson
12 Mar 1974 at 21:45

    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: "Time 0245 Zulu 13Mar1974" [MLNS notes: This should be 2145 the previous date. Low level thumps throughout, with several louder thumps interspersed.] Notes from analysis log: "Cassette number side up - rewind. Hear in distant, the fog horn-like signal, some distant ship traffic. Humpbacks: Pos.; No. Calling: 2; No. Full Calls: N.A.; Notes: At 005 have distant humpbacks, not strong enough for gram, but sounds closer to xphone than previous tape. Minke: Pos.; No. Heard: 3 or 7; No. Trains: 17+. Need for further analysis: Yes (activity). Notes: At 015 hear loud thump train, at 042 hear 2, the slow one, then a 3rd. 054 (3 going on at one time for a short period) at 199, 284, at 320 hear (2) one stronger slow one 377, at 444, at 519, at 564 (slow one) at 626, 680, (724 the slow one), 760, at 800. See gram made on this tape." [MLNS notes: no spectrogram for this tape found in files. 16Dec2003 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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