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Common Minke Whale -- Balaenoptera acutorostrata More
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thumps

 

 

Cole Levenson
6 Mar 1974 at 06:00

    Geography
  • Bahamas
    Locality
  • waterbody:North Atlantic OceanGrand Turk Island; U.S. Naval Facility
No locations found with lat/long
    Channels
  • Mono
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NOTES: Notes on tape: "Time1100 Zulu." [MLNS notes: low level thumps throughout, with several louder trains interspersed.] Notes from analysis log: "Not a full reel; Cassette number side up - rewind. Ambient noise level moderate - at 327 recorder stops & restarts, again at 339, again at 380. Hear distant fog horn like sound in background. Recorder off & on problems 479, at 490 recording stops. Humpbacks: Pos.; No. Calling: 1?; No. Full Calls: N.A.; Need for further analysis: No. Notes: At 100 hear Humpback in background. Humpback level better herre than last reel, still not loud for grams. Minke: Pos.; No. Heard: 3-4; No. Trains: 14+; Need for further analysis: No. Notes: At start 010 have thump train, again at 070, another at 133, a distant thumper at 194, at 230 the slow thumper, at 239 another thumper (loud one). At 270 have a different one ( for a while 2 were heard together. at 295 the Tinney (different one). At 327 have slow thumper. at 369 have one start & stops abruptly. At 407, at 472, at 479, at 490." {MLNS notes: speed problems may be heard as a regular fluctuation. Did not take end sections where recorder kept shutting off 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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