Field Activity 1987-027-FA

Identifier 1987-027-FA
Alternate names DISC 87-1
Purpose Collection of high-resolution seismic reflection data in order to define the geology and shallow structure of the Chesapeake Bay.
Location Cove Point, Sandy Point, northern Chesapeake Bay, Maryland, United States, North America, North Atlantic;
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.
Comments Project = Geology of Chesapeake Bay, Geology of Chesapeake Bay
Platform
Discovery
Length 51 feet; beam 16 feet; draft 4 feet.
Itinerary
Start (port not specified) 1987-07-06
End (port not specified) 1987-07-17
Days in the field 11
Bounds
West -76.5
East -76.08333
North 39.16667
South 38.33333

Personnel

Organization
384 Woods Hole Road
Quissett Campus
Woods Hole, MA02543-1598
(508) 548-8700
Principal investigators Stephen Colman
Crew members
David R Nichols
Scientist, Staff
Affiliate principal Jeff Halka - MGS

Data types and categories

Data category: Seismics, Location-Elevation
Data type: Boomer, Air Gun / Water Gun, Sparker, Sub Bottom Profiler, Navigation

Documents: Notes and log books

Name Description
Cruise report Chief Scientist's cruise report including personnel, purpose, equipment and equipment performance, brief cruise summary, and trackmap.

Equipment used

Equipment Usage description Data types Datasets
ORE GeoPulse Boomer (no data reported)
Benthos AQ-4 10-element hydrophone streamer Air Gun / Water Gun, Boomer, Sparker 3
Datasonics SST 220 sub-bottom 3.5k Sub Bottom Profiler (no data reported)
Loran-C Navigation 4

Datasets

Datasets produced in this activity

Dataset name Equipment Description Dataset contact
1987-027-FA-SE-001 Benthos AQ-4 10-element hydrophone streamer Collection of paper record displays of seismic data( GEOP) for lines Nancy K. Soderberg
1987-027-FA-SE-002 Benthos AQ-4 10-element hydrophone streamer microfilm of Nancy K. Soderberg
1987-027-FA-SE-003 Benthos AQ-4 10-element hydrophone streamer analog tape of seismic data Nancy K. Soderberg
1987-027-FA-LN-001 Loran-C Navigation trackline plot for field activity 87027 Nancy K. Soderberg
1987-027-FA-LN-001-01 Loran-C Trackline map with line numbers, dates and time. Nancy K. Soderberg
1987-027-FA-LN-002 Loran-C Floppy disk(s) containing NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, Nancy K. Soderberg
1987-027-FA-LN-003 Loran-C Digital tape(s) of NV, Nancy K. Soderberg

Publications

Samples collected during this field activity