Hersey J. B.

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Hersey
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J. B.
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  • Technical Report
    Seismic reflection study of the geologic structure underlying southern Narragansett Bay, Rhode Island
    (Woods Hole Oceanographic Institution, 1961-06) Hersey, J. B. ; Nalwalk, A. H. ; Fink, D. R.
    A subbottom reflection survey of southern Narragansett Bay, Rhode Island was made by means of a continuous seismic reflection technique (the Continuous Seismic Profiler)developed at the Woods Hole Oceanographic Institution (Knott and Hersey, 1956). The observational program was conducted in May, 1958 under contract with the Corps of Engineers, U. S. Army, and in May, 1960 under contract with the Bureau of Ships, U . S. Navy, to obtain foundation data for locating hurricane barriers (Corps of Engineers, 1957) and to develop techniques for studying the geologic structure of shallow water areas. At the Woods Hole Oceanographic Institution this work is part of a continuing, broader program directed toward describing the structures and tracing the geologic history of continental margins. The Continuous Seismic Profiler employs a wide-band sound source the pulses from which are reflected from the bottom and from sediment and rock layers beneath the bottom. The sound pulse is synchronized with the sweep of a Precision Graphic Recorder (PGR), which records sound energy received at an underwater detector. (In 1958 the sound source was an early form of the Sparker, while in 1960 the Edgerton Thumper was the source. (These instruments are described below.) When the sound source and the detector are towed from a boat, the reflected sound energy is recorded to present a continuously correlated picture of subbottom structure. Measurements in Narragansett Bay were made south of the Jamestown Bridge in the West Passage and between Conanicut Island and Newport Neck in the East Passage (Fig . 1A and lB). Two additional traverses were made across the bay in areas to the north where core data are available (Fig. 2).
  • Technical Report
    Underwater camera positioning by sonar
    (Woods Hole Oceanographic Institution, 1960-03) Edgerton, Harold E. ; Cousteau, Jacques Y. ; Hersey, J. B. ; Backus, Richard H.
    A pulse sonar system is described for measuring the height above the bottom of an underwater camera and other equipment in the deep oceans. Using this method, cameras have been positioned for photography at depths to about 2,500 fathoms with a precision of about half a fathom. The measurement is achieved by a sonar "pinger" on the equipment, which sends precise 1 pulse-per- second signals to the surface both directly and by reflection from the bottom.
  • Technical Report
    The geographic variation of midwater sound-scattering(u)
    (Woods Hole Oceanographic Institution, 1966-03) Backus, Richard H. ; Hersey, J. B.
    It is suggested in this report that the intensity of midwater sound-scattering in the ocean varies from point to point as the abundance of marine life varies. Several charts depicting variations in the abundance of marine life are given, from which estimates of the intensity of sound-scattering can be made.
  • Technical Report
    Narrative of Chain cruise #43 : February - August 1964
    (Woods Hole Oceanographic Institution, 1965-02) Knott, Sydney T. ; Bunce, Elizabeth T. ; Bowin, Carl O. ; Hersey, J. B. ; Chase, R. L.
    On CHAIN Cruise 43, 15 February to 21 August 1964, geophysical and geological observations were made in the North Atlantic Ocean, the Mediterranean and Red Seas, and the Western part of the Indian Ocean, along the track Woods Hole - Ceuta (Spanish Africa) - La Spezia - Port Said - Aden - Victoria (Seychelles Islands) - Port Louis (Mauritius) - Victoria (Seychelles Islands) - Port Said - Beirut - La Spezia - Monaco - Plymouth (England) - Woods Hole. This report contains (1) a narrative of the cruise, (2) a list of stations, (3) statements of the scientific objectives of the cruise, (4) a summary of the geological and geophysical observations, (5) end-of-cruise reports on equipment and some phases of the research program, and (6) a selection of bottom photographs. WHOI Ref. No. 64-51 contains a detailed navigational plot of the entire cruise, including soundings and the locations of other observations.