Other ID: FAY 020
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Mid-Atlantic Continental Margin, North Atlantic Continental Margin, United States, North America, North Atlantic;
Principal Investigator(s): Kim D. Klitgord
Data Type(s): Electro-Magnetic: Gravity, Location-Elevation: Navigation, Seismics: Air Gun / Water Gun, Seismics: Boomer, Seismics: Sparker, Sonar: Single Beam
Scientific Purpose/Goals: 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.
Start Date: 1976-08-10
Start Port/Location: Norfolk, VA
End Date: 1976-08-24
End Port/Location: Woods Hole, MA
Equipment Used: Gravity meter (wh), Seismic Engineering streamer, Air gun, Western Geophysical Integrated Navigation System, Echosounder
Information to be Derived: Morphology;
Summary of Activity and Data Gathered: 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.
Staff: David Egelson, Frank W. Jennings, Kim D. Klitgord, Stanley Locker, Perry Parks, Phil Shea
Notes: Original Center People field contained: Kim Klitgord - Ch. Sci., Perry Parks - nav./grav. engineer, Frank Jennings - seismic engineer, Gerard McCarthy - mech. tech., Rob Pexton - mech. tech., Phil Shea - mech. tech., David Egelson - nav. watch, Claire Reimers - nav. watch, Scott Heald - nav. watch, Lin Morse - seismic watch, Chris Schoen - seismic watch, Stan Locker - seismic watch, Kevin King - seismic watch.
Klitgord, K.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: 4, download PDF.
Paskevich, V.F., and Soderberg, Nancy K., 1997, Navigation and geophysical data collected onboard the R/V FAY from 1975-1976: URL: http://pubs.usgs.gov/of/of97-512/.