Field Activity 2021-643-FA

Identifier 2021-643-FA
Alternate names 2021 Fairweather EXPRESS Cascadia mapping; H13549
Purpose 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
Location Pacific Ocean, Northern California, Oregon, United States
Summary Fiarweather successfully mapped remaining data gaps within Eel Basin and along the shelf edge. No marine magnetic data were collected, only multibeam bathymetry, backscatter, and water column data. Data will be released through NEIC.
Info derived bathymetry, seafloor backscatter, water-column backscatter
Comments NOAA is the official data repository for this cruise. NOAA cruise ID is H13549.
Homeported in Ketchikan, Alaska, NOAA Ship Fairweather is a hydrographic survey vessel that maps the ocean to support safe navigation and commerce. Fairweather’s officers, technicians, and scientists collect data that NOAA cartographers use to create and update the nation’s nautical charts with ever-increasing precision.
Start Port Hueneme, CA 2021-10-20
End Newport, OR 2021-11-09
Days in the field 21
West -125.39842129
East -123.93350601
North 45.92336372
South 40.38212062


2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
National Oceanic and Atmospheric Administration(NOAA)
Bureau of Ocean Energy Management
Principal investigators Janet Tilden WattHill, Jenna
Crew members
Information specialist(s)
Peter Dartnell
Specialist, Information

Data types and categories

Data category: Sonar, Electro-Magnetic
Data type: Water column reflectivity, Multibeam, Magnetics

Equipment used

Equipment Usage description Data types Datasets
Other Unknown, Multibeam, Single Beam, Sidescan, Interferometric, Sound Velocity (no data reported)
multibeam Multibeam 1
magnetics Magnetics (no data reported)


Datasets compiled from multiple sources

Dataset name Equipment Description Dataset contact
Methane seep locations derived from water-column acoustic backscatter data collected along Cascadia Margin offshore Oregon and Northern California, 2018-2021 multibeam This dataset contains the locations of 902 methane cold seeps that were detected in acoustic water-column backscatter collected by the U.S. Geological Survey between 2018 to 2021. Rising bubbles emitting from methane seeps on the seafloor can be detected acoustically with multibeam echo sounding sonar used to collected seafloor bathymetric mapping data, which the USGS and NOAA have cooperatively collected along the Cascadia Margin offshore of northern California and Oregon for several years. James E Conrad


Samples collected during this field activity