Other ID: GS7903, Leg VII; GS 7903-7
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Santaren Channel, Nicholas Channel, Cay Sal Bank, Bahamas, Straits of Florida, North America, North Atlantic;
Principal Investigator(s): Mahlon M. Ball, Richard E. Sylwester
Affiliate Investigator(s): Wayne Bock - Rosentiel School of Marine and Atmospheric Sciences, U. Miami
Data Type(s): Electro-Magnetic: Gravity, Electro-Magnetic: Magnetics, Seismics: Multichannel, Location-Elevation: Navigation
Scientific Purpose/Goals: Leg VII was planned to obtain gravity, magnetic and seismic reflection data over the Destin Anticline in the northern part of the MAFLA or western Florida Shelf region. These data would have increased our ability to assess the hydrocarbon potential of this huge, partially tested structure. Unfortunately, Hurricane David forced delay in departure and Hurricane Frederick stalled over the work area during scheduled cruise time. We availed ourselves of the University of Miami's entree into the interesting marine geologic problems in Florida-Bahamas waters to obtain geophysical data in Florida Straits, Santaren and Nicholas Channels, north of Cuba in the vicinity of Cay Sal, Bahamas.
Start Date: 1979-09-11
Start Port/Location: Miami, FL
End Date: 1979-09-16
End Port/Location: Miami, FL
Equipment Used: Bell Aerospace BGM-3 gravimeter, LaCoste-Romberg gravimeter G-179, Varian V-75 magnetometer, Multichannel seismics, Western Geophysical Integrated Navigation System
Information to be Derived: Morphology;
Summary of Activity and Data Gathered: Our measurements recorded 2 anticlinal structures with dip reversals spanning several kilometers. These structures are large enough to constitute possible hydrocarbons exploration targets and occur in water depths less than 500 m, which is within currently drillable depths. Gravity data: 550 km; Magnetic data: 400 km; Seismic reflection data: 7 lines, 550 km.
Staff: Barry Irwin, David Mason, Kenneth E. Parolski, Ronald J. Miller, Mahlon M. Ball, Robert F. Bowles, John C., Jr. Hampson, Janet B. Burke, Elizabeth Coward, Alan Goodman, Kathleen Kent, Richard E. Sylwester, Charles W. Holmes
Notes: Original Center People field contained: Mahlon Ball - Ch. Sci., Richard Sylwester - Ch. Sci., Robert Bowles - nav., Barry Irwin - nav., Janet Burke - sci., Alan Goodman - tech., Kenneth Parolski - tech., David Mason - mech. tech., Chuck Holmes - sci., Ronald Miller - sci., Jack Hampson - sci., Kathy Kent - multichannel, Elizabeth Coward - sci.
Ball, M.M., Bowles, Robert L., Coward, Elizabeth L., and Dodd, James E., 1984, Multichannel seismic-reflection profiles collected aboard R/V GILLISS, Cruise GS7903, Leg 7, in Santaren and Nicholas Channels, near Cay Sal, southwestern Bahamas: U.S. Geological Survey Open-File Report 84-346, 3 p. URL: http://pubs.er.usgs.gov/usgspubs/ofr/ofr84346, download PDF.
Ball, M.M., ed., 1983, Multichannel seismic measurements on the northern edge of the Bahaman-Cuban collision zone: U.S. Geological Survey Open-File Report 83-23, 70 p. URL: http://pubs.er.usgs.gov/usgspubs/ofr/ofr8323, download PDF.