Field Activity 1975-011-FA

Identifier 1975-011-FA
Alternate names ASTR 75-JUN
Purpose The cooperative program is designed to provide detailed geological information and an assessment of mineral resources pertaining to that part of the continental shelf beneath the coastal waters of Massachusetts. In anticipation of the development of offshore natural resources of the Commonwealth, the major focus of the research effort is directed toward the occurrance, nature and distribution of these deposits as well as establishment of baseline data for evaluation of environmental impact of exploitation. The sub-bottom profiling surveys provide the foundation for a planned program of vibracoring and bottom sampling of geological features. Laboratory analysis of the vibracore and bottom samples will evaluate the economic importance of the deposits and, coupled with the seismic data, provide information on the geology and geologic history of the area.
Location Rhode Island Sound, Rhode Island, Westport Harbor, Vineyard Sound, Cuttyhunk Island, Nomans Land, Martha's Vineyard, Massachusetts, United States, North America, North Atlantic;
Summary Traverses: 33 (27 in a NW-SE orientation with a line spacing of 1 nm, 6 in a SW-NE orientation with a line spacing of approximately 3 nm); Seismic data: 358 nm (663 km) and penetration of up to 125 meters below the bottom were achieved.
Comments All seismic track lines were pre-plotted along LORAN-C navigation lines of position. This approach facilitated control of the survey vessel on the seismic tracks despite the course setting influence of wind and currents. Cape Race, Newfoundland and Dana, Indiana LORAN-C secondary transmitters were utilized as they are the most reliable and provide the best positional accuracy within the area. Navigational fixes were taken at 15 minute intervals and ship's speed over the bottom averaged 4.5 knots. The hydrophone array and catamaran float with mounted transducer were towed about 15 meters astern of the survey vessel. This configuration, coupled with ship's speed, resulted in a sound source/receiver separation of approximately 10 meters. The transducer was triggered every 0.5 second and the sweep rate of the recorder was set at 0.25 second. Only incoming seismic signals within the 200-4000 Hz frequency range were fed to the recorder. Original Center People field contained: Chuck O'Hara - Chief Scientist, Frank Jennings - Electronic Technician, Patricia Forrestal, Wayne Ferrebee, Elizabeth Winget, Susan Purdy, and Barbara Tausey. Project = Marine Geologic Program, Marine Geologic Program
Platform
Length 46 feet; beam 15 feet 4 inches; draft 4.5 feet.
Itinerary
Start (port not specified) 1975-06-19
End (port not specified) 1975-06-30
Days in the field 12
Bounds
West -71.25
East -70.7
North 41.5
South 41.25

Personnel

Organization
384 Woods Hole Road
Quissett Campus
Woods Hole, MA02543-1598
(508) 548-8700
Principal investigators O'Hara, Charles J.
Crew members
Susan J Barton
Scientist, Staff
O'Hara, Charles J.
Scientist, Staff
Ferrebee, Wayne
Scientist, Staff
Forrestel, Patricia
Scientist, Staff
Jennings, Frank W.
Scientist, Staff
Tausey, Barbara
Scientist, Staff
Winget, Elizabeth
Scientist, Staff
Information specialist(s)
O'Hara, Charles J.
Specialist, Information

Data types and categories

Data category: Location-Elevation, Seismics
Data type: Navigation, Boomer

Documents: Notes and log books

Name Description
Cruise report Cruise Report (pdf file) Chief Scientist's cruise report including equipment, personnel, ship movement notes, data acquisition description, and area map with simplified track map.
Cruise log Composite Cruise Log (pdf file) ASTERIAS-Buzzards Bay cruise log containing seismic and navigation entries from October 1-12, 1973(FA 73005); December 2-3,1974 (FA 74017); and June 19-30, 1975 (FA 75011).
Uniboom log Uniboom Cruise Log (pdf file) Composite Uniboom seismic log for Jun. 19 - Jul. 1, 1975, (FA 75011) and Oct. 17-30, 1975, (FA 75024) containing dates, times, navigation, and comments.

Equipment used

Equipment Usage description Data types Datasets
EG&G 234 Boomer (no data reported)
Loran-C Navigation 2
Raytheon radar Navigation (no data reported)
Visual navigation Navigation (no data reported)
Single channel hydrophone Air Gun / Water Gun, Boomer, Bubble Gun, Sparker, Sub Bottom Profiler 6

Datasets

Datasets produced in this activity

Dataset name Equipment Description Dataset contact
1975-011-FA-LN-001-01 Loran-C Track Map (pdf) Trackline map with line numbers and times. Nancy K. Soderberg
Nav data Loran-C Linda P McCarthy
1975-011-FA-SE-001 Single channel hydrophone film collection of UNI Nancy K. Soderberg
1975-011-FA-SE-002-01 Single channel hydrophone Scanned images of paper seismic records Nancy K. Soderberg
1975-011-FA-SE-002-02 Single channel hydrophone Line information for Scanned images of paper seismic records Nancy K. Soderberg
1975-011-FA-SE-003 Single channel hydrophone microfilm of Nancy K. Soderberg
1975-011-FA-SE-004 Single channel hydrophone Raw SEGY formatted data Nancy K. Soderberg
SEGY data Single channel hydrophone Linda P McCarthy

Publications

Samples collected during this field activity