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Summary for Field Activity Number 1987-027-FA

Alternate Leg ID: DISC 87-1

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

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 100ms 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.

USGS Project Number: MD CO-OP

Contact: Steve Colman (scolman@usgs.gov)

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

Map for Area of Operations :

Map of field activity boundary.

Platform Info:

The following materials for this field activity are available in the Information Archives:

Paper seismic/sidescan bottom profiles:

Inventory #LinesFolderStart TimeEnd TimeProfile TypeRemarks
0429981A,30A,83,33,* 00115:05 07/06/198713:19 07/07/1987 GEOP- DATASONICS*LINES 85,85A,86
0430034,84,32,87,300 00213:22 07/07/198713:03 07/08/1987 GEOP- DATASONICS
04301300,88,86A,35,* 00313:32 07/08/198712:23 07/09/1987 GEOP- DATASONICS*LINE 90
0430290,89A,89,301,* 00413:22 07/09/198709:42 07/10/1987 GEOP- DATASONICS*LINES 400,401
04303401-405,36 00509:45 07/10/198709:57 07/11/1987 GEOP- DATASONICS
0430436,93,93A,92 00609:58 07/11/198716:35 07/11/1987 GEOP- DATASONICS
0430592,302,303 00716:39 07/11/198711:45 07/12/1987 GEOP- DATASONICS
04306303-305,91 00811:55 07/12/198709:33 07/13/1987 GEOP- DATASONICS
0430790A,37,406,407* 00909:35 07/13/198716:57 07/13/1987 GEOP- DATASONICS*LINES 94,39,95
0430838,96,40,97,* 01008:24 07/14/198708:36 07/15/1987 GEOP- DATASONICS*LINES 97A,98
0430998,500-503 01108:39 07/15/198714:24 07/15/1987 GEOP- DATASONICS
04310250-258 01209:40 07/16/198717:41 07/16/1987 GEOP- DATASONICS
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