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Summary Information for Field Activity 1985-031-FA

Area of Operations: central Chesapeake Bay, United States, North America, North Atlantic

Dates: September 17, 1985 to September 24, 1985

Chief scientist: Steve Colman

   Jeff Halka - Maryland Geological Survey (MGS)

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

Type of Activity: Seismic profiling;

Information to be derived: High-resolution seismic reflection and sidescan sonar data

Summary: 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.

Contact: Steve Colman (scolman@usgs.gov)

InfoBank: uses the identifier D-2-85-CH. Visit this site for more information.

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