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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1989-020-FA

Other ID: F9-89-NC

Status: Completed

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

Funding Program(s):

Principal Investigator(s): William Schwab

Affiliate Investigator(s): John Chin, Herman Karl - PMG

Information Specialist(s):

Data Type(s): Seismics: Sub Bottom Profiler, Sonar: Single Beam, Sonar: Sidescan, Electro-Magnetic: Gravity, Location-Elevation: Navigation

Scientific Purpose/Goals: Map continental shelf using AMS 120 sidescan sonar and Klein 100 kHz sidescan sonar.


Start Port/Location: Redwood City, CA

End Port/Location: Drake's Bay, CA

Start Date: 1989-08-02

End Date: 1989-08-18

Equipment Used: 3.5 kHz, Klein 531 sidescan, Gravity meter (wh), 10 kHz Bathymetry, Trimble 4000AX GPS receiver, AMS 120 sidescan, Northstar 7000 LORAN-C, Del Norte, transponder net

Information to be Derived:

Summary of Activity and Data Gathered:

Staff: William Danforth, Thomas O'Brien, William Schwab, Jana DaSilva

Affiliate Staff:
Robin Bouse; Herman Karl - Co-Chief Sci.
PMG; John Chin - Co-Chief Sci.
PMG; Mike Hamer
Kaye Kinoshita
Larry Kooker
Mike Torresan
Hal Williams - PMG; Bob Elder - DSL-WHOI; Tom Dettweiler - Meridian Sciences

Notes: Original Center People field contained: Bill Schwab - Co-chief Sci.; Robin Bouse, Bill Danforth, Jana DaSilva, Tom O'Brien.


Farallon Islands, California, United States, North America, North Pacific;

North: 38.1 South: 37.5 West: -123.3 East: -122.1


photo of Farnella


Folger, D.W., Irwin, Barry J., McCullough, James R., Bouse, Robin M., Polloni, Christopher F., Dodd, James E., and O'Brien, T. F., 1990, Map showing free-air gravity anomalies around the Cape Verde Islands: U.S. Geological Survey Miscellaneous Field Studies Map MF-2098-A, scale 1:750,000.

Sweeney, E.M., Danforth, W.W., Karl, H.A., O'Brien, T.F., and Schwab, W.C., 2004, The Gulf of the Farallones; sidescan-sonar imagery: U.S. Geological Survey Open-File Report 2004-1082, URL:


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
3.5 kHz --- Sub Bottom Profiler
10 kHz Bathymetry --- Single Beam
AMS 120 sidescan --- Sidescan
Sidescan mosaic ( )
Klein 531 sidescan --- Sidescan
Gravity meter (wh) --- Gravity
Northstar 7000 LORAN-C --- Navigation
1989-020-FA-LN-001 ( Navigation data)
Trimble 4000AX GPS receiver --- Navigation
Del Norte, transponder net --- Navigation

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