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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1984-009-FA

Other ID: J-163 (Leg IV)

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): David Twichell

Affiliate Investigator(s): Dr. Robert S. Jones (HBF); Dr. Churchill B. Grimes (Rutgers)

Information Specialist(s):

Data Type(s): Environmental Data: CTD, Imagery: Photo, Imagery: Video, Location-Elevation: Navigation, Sampling: Biology, Sampling: Geology, Seismics: Sub Bottom Profiler

Scientific Purpose/Goals: 1) Test our hypothesis that rough bottom topography in the Mid-Atlantic Bight resulted from bioerosion by the tilefish community, and 2) further develop the use of sidescan sonar and sub-bottom profiling as a tool for assessing critical habitat for fishery resources.


Start Port/Location:

End Port/Location:

Start Date: 1984-07-28

End Date: 1984-08-04

Equipment Used: 3.5 kHz, Grab sampler, Mooring tripod, Seismic reflection, Sidescan sonar, CTD, Camera- deep sea, Video camera - deep sea, Geomechanique streamer, Loran-C

Information to be Derived:

Summary of Activity and Data Gathered: Optimal weather conditions allowed us to conduct a variety of submersible, sidescan sonar and sub-bottom profiling operations in the Middle Ground area between Block and Atlantis submarine canyons. Overall, we successfully completed 13 submersible dives and made numerous transects for sidescan sonar. Sidescan Sonar: 129.64 km; Sub-bottom profiling: 290.39; Sediment samples: 26; video and photos.

Staff: David Twichell

Affiliate Staff:
Dr. Robert S. Jones - co-Ch. Sci. (HBF); Dr. Churchill B. Grimes - co-Ch. Sci. (Rutgers); Dr. Kenneth W. Able - scientist (Rutgers); Dr. Edward P. Laine - scientist (URI); Mr. Gregory C. Kennedy - engineer (HBF); Mr. Simon Sainsbury - engineer (HBF)

Notes: Original Center People field contained: Dave Twichell - scientist.


Middle Grounds area, Block Canyon, Atlantis Canyon, Veatch Canyon, mid-Atlantic Bight, North America, North Atlantic;

North: 40.5 South: 39.83333 West: -71.5 East: -69.5


photo of Johnson
photo of Johnson Sea-link
Johnson Sea-link


Able, K.W., Grimes, C.B., Jones, R.S., and Twichell, D.C., 1993, Temporal and spatial variation in habitat characteristics of tilefish (Lopholatilus hamaeleonticeps) off the east coast of Florida: Bulletin of Marine Sciences, v. 53.

Able, K.W., Twichell, D.C., Grimes, C.B., and Jones, R.S., 1987, Sidescan sonar as a tool for detection of Demersal fish habitats: Fishery Bulletin, v. 85 no. 4.

Twichell, D.C., Grimes, C. B., Jones, R. S., and Able, K. W., 1984, The role of bioerosion in shaping the outer continental shelf around Hudson Canyon, offshore Eastern United States [abs.]: , Geological Society of America, Northeastern Section, 19th Annual Meeting, Abstracts with Programs. Providence, R.I., 15-17 March 1984.

Twichell, D.C., Jones, R. S., Grimes, C. B., Able, K. W., Anonymous,, 1984, Bioerosion; its importance in shaping the outer continental shelf around Hudson Canyon off the eastern United States [abs.]: , Symposia Series for Undersea Research, NOAA National Undersea Research Conference; Undersea research and technology, scientific applications and future needs, Abstracts. Groton, Conn., 22-24 May 1984.


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Video camera - deep sea --- Video
Camera- deep sea --- Photo
Grab sampler --- Biology
Loran-C --- Navigation
1984-009-FA-LN-001-01 ( Track maps of geophysical survey areas and submersible dives, plotted from ship navigation with MapGen software, in Lat./Long.: UTM projection, 1:25,000 scale, 2 maps for each of 5 areas.)
1984-009-FA-LN-002 ( Paper charts from bridge plotter of sidescan sonar and 3.5 kHz survey lines and submersible dives; Loran-C coordinates.)
1984-009-FA-LN-001 ( Paper printouts of navigation with 15 minute or random fix intervals: includes time, lat., long., speed and course over ground.)
Seismic reflection --- Air Gun / Water Gun
Sidescan sonar --- Sidescan
1984-009-FA-SO-001 ( Paper sidescan sonar profiles in folders; images not slant-range or ground-range corrected.)
Mooring tripod --- Ground Truthing
1984-009-FA-OM-001 ( Digital tape(s) of CTD STATION DATA, )
3.5 kHz --- Sub Bottom Profiler
1984-009-FA-SE-001 ( Paper 3.5 kHz seismic profiles in folders: collected via EPC recorder.)
Geomechanique streamer --- Temperature

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