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USGS CMG 85028 Metadata

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ID 85028
Also Known As FRNL85LEG2
F-2-85-GM
85028
Abstract United States Geological Survey, Reston, Virginia. Chief Scientists: Bonnie McGregor, Neil Kenyon. Data (sidescansonar, airgun, 3dot5khz, 10khz, magnetics, loranc, transitsatellite, gps) of field activity 85028 (F-2-85-GM) in Gulf Mexico from 09/05/1985 to 09/29/1985
Organization United States Geological Survey, Reston, Virginia
Project/Theme Exclusive Economic Zones (EEZ)
Geological Long-Range Inclined Asdic (GLORIA)
Chief Scientist Bonnie McGregor
Neil Kenyon
Platform Farnella
Area of Operation Gulf Mexico, Gulf of Mexico
Bounding Coordinates
29.20430
-90.61030     -85.14300
25.08760
Ports leave New Orleans, LA
arrive Tampa, FL
Dates 09/05/1985 (JD 248) to 09/29/1985 (JD 272)
Analog Materials No analog holdings.
Crew
Bonnie McGregor Chief Scientist, USGS Miami
Dave Twichell Chief Scientist, USGS Woods Hole
John Schlee Geologist, USGS Woods Hole
Ron Circe Unsp, USGS Woods Hole
John Wagner Geologist, LSU (Louisiana State University, USA)
Malcolm Harris GLORIA Engineer, IOS (Institute of Oceanographic Sciences, U.K.)
Neil Kenyon Chief Scientist, IOS
Eric Darlington GLORIA Engineer, IOS
Colin Jacobs Geologist, IOS
Ross Walker GLORIA Engineer, IOS
Robert Wallace Airgun Tech, IOS
Stephen Williams Geologist, IOS
Martin Beney Shipboard Computing, RVS (Research Vessel Services, U.K.)
Roy Hadgraft Captain, J. Marr and Sons
Equipment Used
sidescansonar
airgun
3dot5khz
10khz
magnetics
loranc
transitsatellite
gps
Purpose
As part of a cooperative program between the U.S. Geological Survey
and the Institute of Oceanographic Sciences (IOS), U.K., a survey of the
Exclusive Economic Zone (EEZ) in the Gulf of Mexico was conducted aboard the
M/V FARNELLA.  The purpose of the cruise was to map the sea floor between
approximately the shelf edge and the seaward limit of the EEZ, using the
GLORIA (Geologic LOng-Range Inclined Asdic) system owned and operated by
IOS.
  
Additional geophysical data collected simultaneously with the
sidescan data include: 10 kHz, 3.5 kHz, air gun (160 cubic-inch chamber)
with two-channel hydrophone, and magnetometer.  Navigation was principally
based on Loran-C, although transit satellite and Global Positioning System
(GPS) data were also logged for comparison.  All geophysical data were
recorded digitally on magnetic tape and the airgun data were recorded on
analog magnetic tape.  A preliminary mosaic of the sidescan data was
constructed at sea at a scale of 1:375,000, using an anamorphic camera to
adjust the images to the ship's track.  Post-cruise image processing and
enhancement of the data are planned before construction of the final mosaic.
Notes
LEG 2:
  
	Leg 2 focused in the central Gulf of Mexico on the Mississippi Fan
seaward of Louisiana, Mississippi, Alabama, and Florida.  The area mapped
with GLORIA on this leg was approximately 45,000 square nautical miles.
  
Data Summary - Leg 2
  
At sea total number of days:	24 days
  
Mileage for each type of data collected:
  
GLORIA sidescan		4520 nm		8362 km
  
3.5 kHz			4543 nm		8405 km
  
10 kHz			4594 nm		8504 km
  
air gun			4330 nm		8010 km
  
magnetometer		4594 nm		8504 km
  
Comments Leg 2:
  
	The cruise was very successful.  Equipment down time was minimal.
The warm surface water temperature continued to limit the GLORIA range
necessitating closer line spacing than planned.  The presence of the Loop
Current for the last half of the cruise not only provided warm surface
water temperatures, but also a strong current, often approaching 4 knots.
The current shear prevented the GLORIA fish from towing parallel to the
ship's track, introducing some distortion in the mosaic.  In the northeast
portion of the Gulf, near DeSoto Canyon, fishing boats with lines set
across our proposed track caused a problem requiring several lines to be
terminated early.  Leg 3A will collect data to cover these data gaps.  An
additional 8 days will be necessary on Leg 3 to complete the coverage of the
Mississippi Fan.
  
	The objective of this leg was to map the surface features in the
Mississippi Fan area.  Although the channel of the Mississippi could be
identified on the mid-fan, over much of the fan the channel was obscured by
a major submarine slide or slides.  Flow patterns were well displayed on the
surface and the slide could be mapped to the base of the West Florida
Escarpment.  Another submarine slide was also present in the DeSoto Canyon
area.  The meandering channel from DeSoto Canyon was traced from this
slide seaward parallel to the escarpment.  Mass wasting appears to be an
important process in distributing sediments in the deep water of the central
Gulf.  The Sigsbee Escarpment was mapped to the east as far as the
Mississippi Canyon.  Isolated salt diapirs were present to the east of the
Mississippi Canyon.
Publications
Paskevich, Valerie F.; Wong, Florence L.; O'Malley, John J.; Stevenson,
Andrew J.; Gutmacher, Christina E., 2010, GLORIA sidescan-sonar imagery
for parts of the U.S. Exclusive Economic Zone and adjacent areas: U.S.
Geological Survey Open-File Report 2010-1332,
http://pubs.er.usgs.gov/publication/ofr20101332.
  
Twichell, David C., and Paskevich, Valerie, 1996, GLORIA sidescan sonar
field data and navigation data collected in the Gulf of Mexico during
R/V Farnella cruises in 1982 and 1985: U.S. Geological Survey Open-File
Report 96-707,
http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM.
Got Help? For 85028, we would appreciate any information on -- activity type, analog materials, contract, days at sea, dive count, funding, information specialist, information to be derived, kms of navigation, national plan, NGDC Info, owner, project number, scanned materials, seismic description, station count, station description, submersible, summary, tabulated info.
Type Webpage KMZ Arc         Metadata         WHSC
Metadata data     txt  data  FAQ  xml data
Navigation data nav      
Times   060.times      

85028 location map of where navigation 

equipment operated
85028 location map of where navigation 

equipment operated

 
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