Other ID: DISC 87-1
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Cove Point, Sandy Point, northern Chesapeake Bay, Maryland, United States, North America, North Atlantic;
Principal Investigator(s): Stephen Colman
Affiliate Investigator(s): Jeff Halka - MGS
Data Type(s): Seismics: Boomer, Seismics: Air Gun / Water Gun, Seismics: Sparker, Seismics: Sub Bottom Profiler, Location-Elevation: Navigation
Scientific Purpose/Goals: Collection of high-resolution seismic reflection data in order to define the geology and shallow structure of the Chesapeake Bay.
Start Date: 1987-07-06
End Date: 1987-07-17
Equipment Used: ORE GeoPulse, Benthos AQ-4 10-element hydrophone streamer, Datasonics SST 220 sub-bottom 3.5k, Loran-C
Information to be Derived:
Summary of Activity and Data Gathered: The cruise was very successful and was blessed with extremely good weather. A total of 378 nm (700 km) of tracklines was covered. 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 ms 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. Several questions about the relations among the different generations of channels were resolved, and the channels were traced into the northern part of the bay. The cruise effectively completed the basic seismic reflection grid between the mouth of the bay and the Annapolis Bridge.
Staff: David Nichols