Other ID: DISC-85-2
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Principal Investigator(s): Stephen Colman
Affiliate Investigator(s): Jeff Halka - Maryland Geological Survey (MGS)
Data Type(s): Seismics: Boomer, Seismics: Air Gun / Water Gun, Seismics: Bubble Gun, Seismics: Sparker, Seismics: Sub Bottom Profiler, Sonar: Sidescan, Location-Elevation: Navigation
Scientific Purpose/Goals: Collect high-resolution seismic reflection and sidescan sonar data in order to define the geology and shallow structure of the Chesapeake Bay.
Start Date: 1985-09-17
End Date: 1985-09-24
Equipment Used: ORE GeoPulse, Del Norte hydrophone, Datasonics SST 220 sub-bottom 3.5k, EG&G Model SMS 960 Seafloor Mapping System, Northstar 6000 LORAN-C
Information to be Derived:
Summary of Activity and Data Gathered: The cruise was quite successful, despite being cut three days short because of Hurricane Gloria. A total of 280 nm (518 km) of tracklines was covered. Except for the hurricane, weather was excellent with several flat-calm days. The seismic reflection records obtained were very good except in local areas where the sediments contained biogenic gas. Penetration achieved by the seismic signals was mostly 100 msec or more, and the records clearly show the entire Quaternary and upper part of the Tertiary sequence of deposits. Multiple overlapping channels and channel-fill deposits related to major fluctuations in sea level were observed.
Staff: Stephen Colman, Monica Webster, John West
Notes: Original Center People field contained: Steve Colman, Chief Scientist; Monica Webster, GFA; John West, Technician.
central Chesapeake Bay, United States, North America, North Atlantic;