Peter Dartnell Jane A. Rudebusch James E. Conrad Janet T. Watt Jenna C. Hill 20260402 2.0 vector digital data data release DOI:10.5066/P9C5DBMR Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9C5DBMR Peter Dartnell Jane A. Rudebusch James E. Conrad Janet T. Watt Jenna C. Hill 2021 2.0 data release DOI:10.5066/P9C5DBMR Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9C5DBMR 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. Between 2018-2022 the NOAA ships Rainier and Fairweather collected multibeam bathymetry data in 7 areas along the southern Cascadia Margin as part of a cooperative project between the U.S. Geological Survey, Pacific Coastal and Marine Science Center and NOAA. These regions were combined with other publicly available multibeam bathymetry data. The surface was generated to assist research projects studying offshore geohazards including mapping faults, submarine landslides, sediment transport pathways, and seafloor seeps. This shapefile describes the sources used to create the composite multibeam bathymetry surface. These data are not intended to be used for navigation. Additional information about the USGS field activities from which some of these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-642-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-636-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-643-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 1995 2023 ground condition at time data were collected. Complete As needed -125.58 -124.21 43.47 40.16 USGS Metadata Identifier USGS:7ab095ee-e470-4972-9dd4-0bd114206bc5 Global Change Master Directory (GCMD) Bathymetry Seafloor Topography ISO 19115 Topic Category geoscientificInformation USGS Thesaurus bathymetry bathymetry measurement sea-floor characteristics geospatial datasets marine geophysics multibeam sonar Data Categories for Marine Planning Bathymetry and Elevation Marine Realms Information Bank (MRIB) keywords seabed field observation none U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) State of Oregon State of California Cascadia Margin No access constraints USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originators of the dataset and in products derived from these data. Portions of the map used data provided by the Ocean Exploration Trust's (OET) Nautilus Exploration Program, Cruises NA072, NA078, NA080, NA082, NA122, and NA130. This information is not intended for navigation purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov SouthernCascadia_30m_datasources_V2.png Quick view image of the data source polygon shapefile used to create a southern Cascadia Margin composite multibeam bathymetry surface PNG ArcMap (ver. 10.3.1) on a Windows 10 computer and ArcGIS Pro (version 3.5.5) on a Windows 11 computer. No formal attribute accuracy tests were conducted. No formal logical accuracy tests were conducted. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Polygons were hand-drawn around each individual multibeam bathymetry dataset. not applicable The Ocean Exploration Trust's, Nautilus Exploration Program collected multibeam echosounder data along the southern Cascadia Margin between 2016 and 2020 (OET survey ID's NA072, NA078, NA080, NA082, and NA122). The U.S. Geological Survey, Pacific Coastal and Marine Science Center requested and received both raw line files and processed grids (these data are now available from NOAA, National Centers for Environmental Information, https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html). Raw survey line files were imported and processed in Caris HIPS and SIPS software (version 11). The data were gridded into 30-m surfaces and exported as GeoTIFF or ASCIIRaster files and imported into ArcMap. 2020 Publicly available multibeam echosounder data available from NOAA, National Centers for Environmental Information were downloaded from https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html. Survey ID's include AT26-02, SKQ201607S, SKQ201804S, HLY18TB, MV1405, TN265, TN240, EX0907, RR1803, and SR1810. The raw survey and transit lines files were imported and processed in Caris HIPS and SIPS software (version 11). The data were gridded into 30-m surfaces and exported as GeoTIFF or ASCIIRaster files and imported into ArcMap. 2020 California Seafloor Mapping Program multibeam echosounder data collected nearshore in the State waters of California and southern Oregon (Survey ID's H12130, H12131, H11985, H11983, H11982, H11981, H11980, H11979, H11978, H11977, H11976, H11975, H11974, H11973) were downloaded as BAG files from NOAA, NCEI, https://ngdc.noaa.gov/mgg/bathymetry/relief.html. The BAG files were imported into ArcMap and resampled to 30-m resolution. 2020 A processed multibeam bathymetry grid from Monterey Bay Aquarium Research Institute (MBARI) was downloaded as an ASCIIRaster file from http://www3.mbari.org/data/mapping/NorCal_Oregon_Margin/eel_river.htm (EelriverA.asc.gz). The bathymetry data were imported into ArcMap and projected from geographic coordinates to UTM, zone 10, WGS84 coordinates. The UTM grid was reprojected to UTM, zone 10, NAD83 coordinates and resampled to 30-m resolution. 2020 Accessed processed multibeam bathymetry data collected by the USGS during field activity 2014-607-FA. Cochrane, G.R., Dartnell, P., Hemery, L.G., and Hatcher, G., 2017, Data release for USGS field activity 2014-607-FA, Oregon OCS seafloor mapping: selected lease blocks relevant to renewable energy (ver. 2.0, July 2017), U.S. Geological Survey data release, https://doi.org/10.5066/F7V40S8V 2020 Accessed from U.S Geological Survey, Pacific Coastal and Marine Science Center archives, processed multibeam bathymetry data collected in 1995 by the R/V Pacific Hunter as part of the STRATAFORM Project. Mayer, L., and J. Hughes Clarke, (1995). STRATAFORM Cruise Report: R/V Pacific Hunter, Multibeam Survey, July 14-28. 2020 In 2018 and 2019 the NOAA ships Rainier and Fairweather mapped five regions along the southern Cascadia Margin (NOAA survey IDs H13117, H13118, H13206, W00474, and W00475) using Kongsberg EM-710 multibeam echosounders. These bathymetry surfaces are available from NOAA, National Centers for Environmental Information and were downloaded from https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html as BAG files. The BAG files were imported into Caris HIPS and SIPS, version 11 and converted to LAS files. The files were imported into ArcMap, version 10.8.1 and converted to grids. 2021 Polygons were drawn by hand around each of the above bathymetry grids in ArcMap (ver. 10.3.1). Attributes were assigned to each polygon including mapping group, year, multibeam system, source information, and data quality. 2021 In 2021 and 2022 the NOAA ship Fairweather mapped two regions along the southern Cascadia Margin (NOAA survey IDs H13549, H13691) using Kongsberg EM-710 multibeam echosounders. Bathymetry surfaces are available from NOAA, National Centers for Environmental Information at https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html as BAG files. The raw survey and transit line files were obtained from NOAA and imported and processed in Caris HIPS and SIPS software (version 11). The data were gridded into 30-m surfaces and exported as GeoTIFF rasters and then imported into Esri ArcGIS Pro (version 3.5.5). 2023 In 2022 and 2023 the NOAA ship Okeanos Explorer mapped three regions along the southern Cascadia Margin (NOAA survey IDs EX2208, EX2301, EX2307) using Kongsberg EM-304 multibeam echosounders. Bathymetry surfaces are available from NOAA, National Centers for Environmental Information at https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html as GeoTIFF files. The raw survey and transit line files were downloaded, then imported and processed in Caris HIPS and SIPS software (version 11). The data were processed gridded into 30-m surfaces and exported as GeoTIFF rasters and then imported into Esri ArcGIS Pro (version 3.5.5). 2026 In 2021 the Ocean Exploration Trust's E/V Nautilus mapped a region along the southern Cascadia Margin (NA130) using a Kongsberg EM-302 multibeam echosounder. Bathymetry data are available from NOAA, National Centers for Environmental Information at https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html as GSF files. The raw survey and transit line files were downloaded, then imported and processed in Caris HIPS and SIPS software (version 11). The data were processed gridded into 30-m surfaces and exported as GeoTIFF raster and then imported into Esri ArcGIS Pro (version 3.5.5). 2026 Publicly available multibeam echosounder data available from NOAA, National Centers for Environmental Information were downloaded from https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html. Survey ID's include AT42-16 and MGL2211. The raw survey and transit line files were imported and processed in Caris HIPS and SIPS software (version 11). The data were gridded into 30-m surfaces and exported as GeoTIFF files and imported into Esri ArcGIS Pro (version 3.5.5). 2026 Polygons were drawn by hand around each of the above bathymetry grids (EX2208, EX2301, EX2307, NA130, AT42-16, MGL2211, H13549, H13691) in ArcGIS Pro (version 3.5.5). Attributes were assigned to each polygon including mapping group, year, multibeam system, source information, and data quality. 2026 Vector GT-polygon composed of chains 38 Universal Transverse Mercator 10 0.9996 -123.00000 0.00000 500000.0 0.00 coordinate pair 0.1 0.1 Meters NAD83 GRS80 6378137.00 298.257222101 SouthernCascadia_bathy_sources_v2 Table containing attribute information associated with the data set. USGS FID Internal feature number. Esri 0 37 Shape Feature geometry. Esri shape defining the features. Ship name of the survey vessel USGS name of the survey vessel Multibeam multibeam system used to collect data USGS type and model of various instrument(s) used to collect the multibeam data on each cruise Year Year of data collection USGS Year of data collection Cruise_ID Cruise ID USGS unique cruise identification assigned by each institution Vert_Cont Original vertical reference datum USGS Original vertical reference datum Horiz_Cont Original horizontal reference datum USGS Original horizontal reference datum Quality metrics of data quality USGS Mean difference, standard deviation, and percent water depth calculations with adjacent, overlapping datasets. Notes Notes on dataset quality. An empty cell means no additional information is noted. USGS Notes on dataset quality or reference to survey report on survey webpage. Sources description of data source including URL USGS description of data source including URL Group Group, Organization, Agency, Program, or Project that collected the data USGS Group, Organization, Agency, Program, or Project that collected the data Zip file of bathymetry data sources in polygon shapefile format. U.S. Geological Survey U.S. Geological Survey - ScienceBase Mailing and Physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov These data are available in ESRI shapefile format. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Shapefile ArcGIS Pro (version 3.5.5) Downloadable zip file contains a shapefile of multibeam sources. WinZip 0.0619 https://doi.org/10.5066/P9C5DBMR Data can be downloaded using the Network_Resource_Name link and scrolling down to the Sonar Data section. None. The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing a shapefile file. 20260402 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998