1985-019-FA (CMHRP activity #882)

Field Activity 1985-019-FA

Identifier

1985-019-FA

Alternate names

LYNCH70485; LYNC 704-85

Purpose

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.

Location

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

Summary

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.

Comments

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

Platform

Lynch

Length 209 feet; beam 40 feet; draft 16 feet.

Itinerary

Start	Yorktown, VA	1985-06-09
End	New London, CT	1985-06-30
Days in the field	20

Bounds

West	-77.02877285
East	-75.7591944
North	33.98082107
South	31.95009301

Personnel

Organization

USGS, Woods Hole Coastal and Marine Science Center(WHCMSC)

384 Woods Hole Road

Quissett Campus

Woods Hole, MA02543-1598

(508) 548-8700

Principal investigators

Anne M. Trehu

Crew members

Gregory K Miller	Scientist, Staff
Barry J Irwin	Scientist, Staff
James Dodd	Scientist, Staff
Savela, Corina	Scientist, Staff
Anne M. Trehu	Scientist, Staff

Information specialist(s)

Anne M. Trehu

Specialist, Information

Affiliate principal

Al Ballard - NORDA

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

Data types and categories

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

Documents: Notes and log books

Name	Description
Cruise report	Chief Scientist's report including personnel, purpose, equipment, tabulated information and cruise summary. Includes OBS and CTD locations, and trackmap.
Navigation log	Navigation log describing line and diskette start and end times, shot times, ship speed, instrument configuration and data acquisition notes, and 2 area track maps.
Data inventory	Cruise Curator's inventory of data collected at sea.

Equipment used

Equipment	Data types	Datasets
Air gun	Air Gun / Water Gun	(no data reported)
Ocean Bottom Seismometer	Ocean Bottom Seismometer	2
Single channel hydrophone	Air Gun / Water Gun, Boomer, Bubble Gun, Sparker, Sub Bottom Profiler	1
3.5 kHz	Sub Bottom Profiler	(no data reported)
USGS mini-INS system	Navigation	(no data reported)

Datasets

Datasets produced in this activity

Dataset name	Equipment	Description	Dataset contact
1985-019-FA-SE-002	Ocean Bottom Seismometer	Digital tape(s) of OBS, OBIP,	Nancy K. Soderberg
1985-019-FA-SE-003	Ocean Bottom Seismometer	Digital tape(s) of OBS, OBIP,	Nancy K. Soderberg
1985-019-FA-SE-001	Single channel hydrophone	microfilm of	Nancy K. Soderberg