USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1987-027-FA

Other ID: DISC 87-1

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

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

Information Specialist(s):

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.

Vehicle(s):

Start Date: 1987-07-06

Start Port/Location:

End Date: 1987-07-17

End Port/Location:

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

Affiliate Staff:

Notes:
Project = Geology of Chesapeake Bay, Geology of Chesapeake Bay

Location Map:

Platform(s):

photo of Discovery
Discovery

Publications

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
ORE GeoPulse --- Boomer
Benthos AQ-4 10-element hydrophone streamer --- Air Gun / Water Gun
Boomer
Sparker
1987-027-FA-SE-002 ( microfilm of )
1987-027-FA-SE-001 ( Collection of paper record displays of seismic data( GEOP) for lines )
1987-027-FA-SE-003 ( analog tape of seismic data)
Datasonics SST 220 sub-bottom 3.5k --- Sub Bottom Profiler
Loran-C --- Navigation
1987-027-FA-LN-002 ( Floppy disk(s) containing NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, NV-MEGAPULSE, )
1987-027-FA-LN-003 ( Digital tape(s) of NV, )
1987-027-FA-LN-001-01 ( Trackline map with line numbers, dates and time. )