USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1985-019-FA

Other ID: LYNCH70485; LYNC 704-85

Status: Completed

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

Funding Program(s):

Principal Investigator(s): Anne M. Trehu

Affiliate Investigator(s): Al Ballard - NORDA

Information Specialist(s): Anne M. Trehu

Data Type(s): Seismics: Air Gun / Water Gun, Seismics: Ocean Bottom Seismometer, Seismics: Boomer, Seismics: Bubble Gun, Seismics: Sparker, Seismics: Sub Bottom Profiler, Location-Elevation: Navigation

Scientific Purpose/Goals: Determine the velocity structure of the crust at the continent-ocean boundary beneath the Carolina Trough. This information is needed to model the tectonic and thermal process of rifting. Cruise also included the first major deployment of OBSes designed by Bruce Ambuter, after fixing major problems identified in earlier experiments.

Vehicle(s):

Start Date: 1985-06-09

Start Port/Location: Yorktown, VA

End Date: 1985-06-30

End Port/Location: New London, CT

Equipment Used: Air gun, Ocean Bottom Seismometer, Single channel hydrophone, 3.5 kHz, USGS mini-INS system

Information to be Derived:

Summary of Activity and Data Gathered: Explosive refraction data: 465 km; airgun refraction and single-channel streamer data: 305 km; continuous wave source data: 340 km; 3.5 kHz data: 1500 km; USGS OBS stations: 19; Scripps OBS stations: 6; CTDs: 4.

Staff: Barry Irwin, Gregory Miller, James E. Dodd, Corina Savela, Anne M. Trehu

Affiliate Staff:
Al Ballard - Chief Scientist
NORDA; Bill Everard
NORDA; Bill Eslick
NORDA; Norm Lombard
NORDA; Leroy Dorman
Scripps (Leg 1 only); David Willoughby
Scripps; Martin Vogel
Scripps; James Dolan
Scripps; Tony Schreiner
Scripps (Leg 1 only); Richard Wilkenson
NRL (Leg 2 only); Lee Houston
NRL (Leg 2 only); Ken Crawford
NAVOCEANO

Notes: Cruise included two legs: LEG 1 - 06/09-19/1985, Yorktown, VA returning to Yorktown, VA; LEG 2 - 06/19-30/1985, from Yorktown, VA returning to New London, CT. Original Center People field contained: Anne Trehu, Chief Scientist; Barry Irwin (Leg 1 only); Jim Dodd (Leg 2 only); Corina Savela; Greg Miller.
Project = Continental margin deep crustal structure and seismicity, Continental margin deep crustal structure and seismicity

Location:

Carolina Trough, United States, North America, North Atlantic;

Boundaries
North: 33.95139 South: 31.6 West: -76.8522 East: -75.67639

Platform(s):

photo of Lynch
Lynch

Publications

Trehu, A.M., Miller, G. K., Gettrust, J. F., Ballard, A., Dorman, L. M., and Schreiner, T., 1986, Deep crustal structure beneath the Carolina Trough [abs.]: , Eos, Transactions, American Geophysical Union. San Francisco, Calif., 8-12 December 1986.

Trehu, A.M., Ballard, A., Dorman, L. M., Gettrust, J. F., Klitgord, K. D., and Schreiner, A., 1989, Structure of the lower crust beneath the Carolina Trough, U.S. Atlantic continental margin: Journal of Geophysical Research, v. 94 no. B8, URL: http://www.agu.org/journals/ABS/1989/JB094iB08p10585.shtml.

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Air gun --- Air Gun / Water Gun
Ocean Bottom Seismometer --- Ocean Bottom Seismometer
1985-019-FA-SE-003 ( Digital tape(s) of OBS, OBIP, )
1985-019-FA-SE-002 ( Digital tape(s) of OBS, OBIP, )
Single channel hydrophone --- Air Gun / Water Gun
Boomer
Bubble Gun
Sparker
Sub Bottom Profiler
1985-019-FA-SE-001 ( microfilm of )
3.5 kHz --- Sub Bottom Profiler
USGS mini-INS system --- Navigation