USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1990-010-FA


Status: Completed

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

Funding Program(s):

Principal Investigator(s): William J. Strahle

Affiliate Investigator(s): Richard Sternberg, Univ. WA

Information Specialist(s):

Data Type(s): Visual Identification: Ground Truthing, Sampling: Chemistry, Sampling: Geology, Sampling: Biology

Scientific Purpose/Goals: To study the movement of sediment particles in the water column, the accumulation of sediment particles on the sea bed, and the effects that sediment particles have on geochemical processes in the water column and sea bed. On this leg of cruise, recover moorings deployed during Leg 2, February 1990.


Start Date: 1990-06-16

Start Port/Location: Belem, Brazil

End Date: 1990-06-24

End Port/Location: Belem, Brazil

Equipment Used: Mooring tripod, GEOPROBE, Gill Nets

Information to be Derived:

Summary of Activity and Data Gathered: The mooring at site M-1 was recovered first with all instruments except for one Datawell Waverider which apparently broke free and drifted out of the study. All instruments were recovered from site M-3 with no complications. At site M-2 the instrumented mooring had to be dragged for with grappling hooks because all surface buoys deployed at M-2 had broken free. All instruments on the mooring were recovered by dragging except for one which was subsequently found and returned by Brazilian fishermen. The instrumented tripod, GEOPROBE, was recovered using a trawling net. The instruments on the tripod were recovered undamaged and with data preserved.

Staff: William J. Strahle

Affiliate Staff:
Richard Sternberg
Univ. WA - Ch. Sci.; Robert Beardsley
WHOI; Richard Limeburner
WHOI; Peter Clay
WHOI; Scott Worrilow
WHOI; David Simoneau
WHOI; Gail Kineke
U WA; George Tate
USGS-PMG; Joanne Ferreira
USGS-PMG; Nelson Hogg
U.S. Navy; Belmiro Castro; Luiz de Miranda; Reinaldo Boneto; Paul Alcarpe; Marnio Alves; Valdenira dos Santos; E. Walcott; A. Fernandes

Notes: Information derived from schedule and InfoBank.


Amazon Shelf, Brazil, South America, South Atlantic;

North: 19.75 South: -9.75 West: -59.75 East: -29.75


photo of Columbus Iselin
Columbus Iselin



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Mooring tripod --- Ground Truthing
GEOPROBE --- Mooring (physical oceanography)
Gill Nets --- Biology