Other ID: J-163 (Leg IV)
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Middle Grounds area, Block Canyon, Atlantis Canyon, Veatch Canyon, mid-Atlantic Bight, North America, North Atlantic;
Principal Investigator(s): David Twichell
Affiliate Investigator(s): Dr. Robert S. Jones (HBF); Dr. Churchill B. Grimes (Rutgers)
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 Date: 1984-07-28
End Date: 1984-08-04
Equipment Used: Video camera - deep sea, Camera- deep sea, Grab sampler, Loran-C, Seismic reflection, Sidescan sonar, Mooring tripod, CTD, 3.5 kHz, Geomechanique streamer
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
Notes: Original Center People field contained: Dave Twichell - scientist.