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Summary Information for Field Activity 1976-030-FA

Area of Operations: Mid-Atlantic Continental Margin, North Atlantic Continental Margin, United States, North America, North Atlantic

Dates: August 10, 1976 to August 24, 1976

Chief scientist: Kim Klitgord

Objectives: Primary objectives were to look for geophysical evidence for the continuation of fracture zones from the Mesozoic sea-floor spreading anomalies into the continental margin, investigate the source of lineated magnetic anomalies in the Jurassic Quiet Zone, and obtain additional seismic data on the continental rise and slope.

Type of Activity: Seismic profiling;

Information to be derived: Morphology;

Summary: FAYs depature from Norfolk was delayed for 2 days while Hurricane Belle passed just off the coast. We finally departed at 0800 on August 10th with good weather and calm seas. Airgun, magnetometer, minisparker and 3.5 kHz were deployed at 1900Z near the edge of the continental shelf. The 3.5 kHz proved almost worthless in deep water, so after a few hours the system was turned off and the recorder used as a spare for the airgun system. The other systems ran smoothly for the entire cruise with only brief shutdowns of the airgun system to fix the guns and of the minisparker for regular maintenance. Heading into port on August 24th, we pulled the airgun and magnetometer at the 50 fathom contour but left the minisparker out as we crossed part of Nantucket Shoals. The only major problem was the high noise level on the Geometric gradiometer. Scatter in field readings (+/-2 gammas) made small gradients in the quiet zone impossible to see. The bottles were examined several times and the depressors adjusted to no avail. It appeared the ship has a rather large permanent magnetic field. Problems with LORAN-C reception were eliminated by replacing the corroded terminal box. Gravity: 3950 km; Airgun: 3700 km; Magnetics: 3700 km; Minisparker: 3700 km; 3.5 kHz: 60 km; Sidescan sonar: 0.

Contact: Kim Klitgord ()

InfoBank: uses the identifier F-20-76-MC. Visit this site for more information.

Related Links: http://pubs.usgs.gov/of/of97-512/

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Platform Info:
FAY

Publications resulting from these data

Paskevich, Valerie F., and Soderberg, Nancy K.,1997, Navigation and geophysical data collected onboard the R/V FAY from 1975-1976: U.S. Geological Survey Open-File Report 97-512, CD-ROM. (Also available at http://pubs.usgs.gov/of/of97-512/)

Klitgord, Kim D.,1979, Availability of single channel seismic refraction profiles collected over U.S. Atlantic Continental Slope and Rise north of Cape Hatteras - USGS Cruises FAY 20 and FAY 21 - August/September, 1976: U.S. Geological Survey Open-File Report 79-578, 4 p.. (Available as a PDF version)


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