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Summary Information for Field Activity 1987-027-FA

Area of Operations: Cove Point, Sandy Point, northern Chesapeake Bay, Maryland, United States, North America, North Atlantic

Dates: July 06, 1987 to July 17, 1987

Chief scientist: Steve Colman

   Jeff Halka - MGS

Objectives: Collection of high-resolution seismic reflection data in order to define the geology and shallow structure of the Chesapeake Bay.

Type of Activity: Seismic profiling;

Information to be derived: Seismic reflection records

Summary: 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.

Contact: Steve Colman (scolman@usgs.gov)

InfoBank: uses the identifier D-1-87-CH. Visit this site for more information.

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