2019-636-FA (CMHRP activity #8201)

Field Activity 2019-636-FA

Identifier

2019-636-FA

Alternate names

2019 Cascadia Margin Mapping; W00474; W00475

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

central and southern Cascadia margin

Summary

Bathymetry, backscatter, water-column, and magnetics data collected were collected offshore Coos bay and in the eel basin

Info derived

bathymetry, acoustic-backscatter, water-column backscatter, magnetics

Projects

Other

Platform

Fairweather

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.

Vehicles

Grand Caravan G41-1761S

Itinerary

Start	Newport, OR	2019-08-12
End	Newport, OR	2019-08-23
Days in the field	15

Bounds

West	-126.18896484
East	-123.59619141
North	46.4378569
South	40.27952567

Personnel

Organization

USGS, Pacific Coastal and Marine Science Center(PCMSC)

2885 Mission Street

Santa Cruz, CA95060

(831) 460-7401

Principal investigators

Peter DartnellJames E ConradJanet Tilden Watt

Crew members

Peter Dartnell	Scientist, Staff
James E Conrad	Scientist, Staff

Information specialist(s)

Peter Dartnell

Specialist, Information

Data types and categories

Data category:	Electro-Magnetic, Location-Elevation, Sonar
Data type:	Magnetics, Navigation, Multibeam

Equipment used

Equipment	Usage description	Data types	Datasets
Magnetometer	G-882 marine magnetometer was towed behind the vessel and collected total field magnetic data during the cruise	Magnetics	(no data reported)
Kongsberg EM-710	Collected multibeam, backscatter, and water column data	Multibeam	3
Differential GPS	Pos-mv used for multibeam data	Navigation	(no data expected)

Datasets

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	Kongsberg EM-710	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
Composite multibeam bathymetry surface of the southern Cascadia Margin offshore Oregon and northern California	Kongsberg EM-710	Data from various sources, including 2018 and 2019 multibeam bathymetry data collected by the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Geological Survey (USGS) were combined to create a composite 30-m resolution multibeam bathymetry surface of southern Cascadia Margin offshore Oregon and northern California. The data are available as a geoTIFF file.	Peter Dartnell
Polygon shapefile of data sources used to create a composite multibeam bathymetry surface of the southern Cascadia Margin offshore Oregon and northern California	Kongsberg EM-710	This polygon shapefile describes the data sources used to create a composite 30-m resolution multibeam bathymetry surface of southern Cascadia Margin offshore Oregon and northern California.	Peter Dartnell