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Summary Information for Field Activity 1976-020-FA

Area of Operations: outer continental shelf, inner Blake Plateau, Florida, Georgia, South Carolina, North Carolina, United States, North America, North Atlantic

Dates: June 20, 1976 to June 29, 1976

Chief scientist: Bill Dillon

Objectives: Geophysical reconnaissance of southeast Georgia Embayment.

Type of Activity: Seismic profiling; magnetics; gravity;magnetics
gravity

Information to be derived: Morphology;

Summary: FAY sailed from Ft. Lauderdale at noon on June 20, 1976. All systems began operation on June 21, 1976 at 0800 and continued until June 29, 1976 at 0800. One tie line was run along the shelf from Daytona Beach to Cape Fear, then 8 cross-shelf lines were obtained between Cape Fear and Charleston, spaced about 30 km apart. These lines were about 160 km long, extending from shallow water (10 m) to 600 m on the inner Blake Plateau. Average operating speed was about 6.5 kts. Due to a 4-day delay, the survey of a possibly active fault on the outer edge of the Blake Plateau was postponed until fall. The relatively high operating speed and generally excellent weather allowed us to make up some lost time. The sparker system produced excellent high-resolution records and the airgun system was adjusted for a relatively high-frequency bandpass (32 - 205 Hz) to improve resolution. No apparent loss of penetration could be noted with this high bandpass. The addition of the 160 cu. in. airgun to the 3 small guns did not appear to change gun signature but did increase power, so the 4 guns were run together for the remainder of the cruise. The FAY was an exceptionally well run, well maintained ship under Captain Olander and Chief Engineer Weeks, and we received excellent cooperation throughout the cruise from all the officers and crew members. Seismic profiles: 2000 km; Magnetics: 2000 km; Gravity: 2600 km.

Contact: Bill Dillon (bdillon@usgs.gov)

InfoBank: uses the identifier F-17-76-SE. Visit this site for more information.

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

Click to get Google Software - Download 76020.kml to view this field activity in Google Earth

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/)

Popenoe, Peter, and Spalding, J.S.,1988, Isopach and structure contour maps of the Miocene and post-Miocene sediments in the southeast Georgia Embayment, Florida-Hatteras Shelf, offshore Georgia: U.S. Geological Survey Open-File Report 88-397, 12 p.. (Also available at http://pubs.er.usgs.gov/djvu/OFR/1988/ofr_88_397.djvu)

Popenoe, P., and Manheim, F.T.,2001, Origin and history of the Charleston Bump--geological formations, currents, bottom conditions, and their relationship to Wreckfish habitats on the Blake Plateau, in Sedberry, G.R., ed., Island in the Stream--Oceanography and Fisheries of the Charleston Bump: American Fisheries Society Symposium, v. 25: p. 43-94

Data Types and Locations:

 

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