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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 2019-636-FA

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AKA: none

Other ID: 2019 Cascadia Margin Mapping; W00474; W00475

Status: Completed

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

Funding Program(s): Other (Other)

Principal Investigator(s): James Conrad, Peter Dartnell, Janet Watt

Affiliate Investigator(s):

Information Specialist(s): Peter Dartnell

Data Type(s): Electro-Magnetic: Magnetics, Location-Elevation: Navigation, Sonar: Multibeam

Scientific Purpose/Goals: Collect multibeam bathymetry, acoustic-backscatter, water-column backscatter, and magnetics data along the slope of the Cascadia margin to fill in gaps in hi-resolution multibeam imagery for subduction zone hazard characterization

Vehicle(s): Grand Caravan G41-1761S

Start Port/Location: Newport, OR

End Port/Location: Newport, OR

Start Date: 2019-08-12

End Date: 2019-08-23

Equipment Used: Magnetometer, Kongsberg EM-710, Differential GPS

Information to be Derived: bathymetry, acoustic-backscatter, water-column backscatter, magnetics

Summary of Activity and Data Gathered: Bathymetry, backscatter, water-column, and magnetics data collected were collected offshore Coos bay and in the eel basin

Staff: James Conrad, Peter Dartnell

Affiliate Staff:



central and southern Cascadia margin

North: 46.4378569 South: 40.27952567 West: -126.18896484 East: -123.59619141


photo of Fairweather


Dartnell, P., Conrad, J.E., Watt, J.T., and Hill, J.C., 2021, Composite multibeam bathymetry surface and data sources of the southern Cascadia Margin offshore Oregon and northern California: U.S. Geological Survey data release,

Dartnell, P., Watt, J.T., Hill, J.C., and Conrad, J.E., 2023, Composite multibeam bathymetry surface and data sources of the central Cascadia Margin offshore Oregon: U.S. Geological Survey data release,


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
MagnetometerG-882 marine magnetometer was towed behind the vessel and collected total field magnetic data during the cruiseMagnetics
Kongsberg EM-710Collected multibeam, backscatter, and water column dataMultibeam
Differential GPSPos-mv used for multibeam dataNavigation
No data was collected

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