USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1989-001-FA

Other ID: F1-89-NC

Status: Completed

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

Funding Program(s):

Principal Investigator(s): David Twichell

Affiliate Investigator(s):

Information Specialist(s):

Data Type(s): Seismics: Boomer, Sonar: Sidescan, Seismics: Air Gun / Water Gun, Sampling: Geology, Location-Elevation: Navigation

Scientific Purpose/Goals: The objectives of cruises 89001 and 89002 were to obtain a baseline data set of high-resolution sidescan sonar imagery, single-channel geophysical profiles (high- resolution) of the shallow sub-bottom, intermediate-penetration 40 cubic inch airgun profiles, and surface sediment samples. The baseline data set was designed to allow us to characterize and understand this shallow segment of the continental margin off San Francisco, and to serve as a preliminary database for subsequent, more detailed and site specific studies.


Start Date: 1989-01-06

Start Port/Location: Redwood City, CA

End Date: 1989-01-11

End Port/Location: San Francisco, CA

Equipment Used: Huntec Hydrosonde Deep-Tow system, Klein 531 sidescan, Air gun, ORE GeoPulse, Grab sampler - Van Veen , GPS (wh), Loran-C, Del Norte, transponder net

Information to be Derived:

Summary of Activity and Data Gathered: Tracklines: 24 (765 km); Gravity: 748 km; Huntec sidescan: 787 km; Sidescan sonar: 284 km; Uniboom: 754 km.

Staff: David Nichols, Thomas O'Brien, David Twichell

Affiliate Staff:
Dave Rubin
John Chin
Lisa Webber
Larry Kooker
Jon Erickson
Dennis Mann
J. Anarena (volunteer)
Mark Sheridan (volunteer)
Leda Beth Pickthorn

Notes: This cruise is one of two legs (FA 89001 = F1-89-NC, FA 89002 = F2-89-NC). Original Center People field contained: Dave Twichell, Dave Rubin, John Chin, Lisa Webber, Dave Nichols, Larry Kooker, Tom O'Brien, Jon Erickson, Dennis Mann, J. Anarena (volunteer), Mark Sheridan (volunteer), Leda Beth Pickthorn. Original Submitted By field contained: Dave Twichell / John Chin / Dave Rubin.


Gulf of the Farallones, California, United States, North America, North Pacific;

North: 38.25 South: 37.25 West: -123.5 East: -122


photo of Farnella



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Huntec Hydrosonde Deep-Tow system --- Boomer
Klein 531 sidescan --- Sidescan
Air gun --- Air Gun / Water Gun
ORE GeoPulse --- Boomer
Grab sampler - Van Veen --- Geology
GPS (wh) --- Navigation
Loran-C --- Navigation
Del Norte, transponder net --- Navigation