Alicia F. Balster-Gee Jenna C. Hill Thomas F. O’Brien 20200225 seismic-reflection data in SEG-Y format data release DOI:10.5066/P950276G Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P950276G https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P950276G/dd52818abf5b47809f8f682cece00ddb/W196NC-boomer-sgy.zip This data release contains boomer subbottom data collected in June and July of 1996 on the shelf and slope offshore Eureka, California. Subbottom acoustic penetration spans up to several tens of meters, and is variable by location. This data release contains digital SEG-Y data. The data were collected aboard the R/V Wecoma using a Huntec Hydrosonde Deep-Tow system. The U.S. Geological Survey (USGS) collected boomer subbottom profiles in the summer of 1996 offshore Eureka, California, as part of the STRATAFORM Project, which aimed to image the upper 100 meters of sediment and to determine architecture of depositional units along continental margins (Minasian and others, 2001). These data and information are intended for science researchers, students from elementary through college, policy makers, and general public. Additional information about the field activities from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=1996-030-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 19960629 19960707 ground condition at time data were collected Complete As needed -125.255 -124.14551 41.1373 39.91816 USGS Metadata Identifier USGS:90c444d0-2b4f-4fe4-9ddf-814c78cd6a6e ISO 19115 Topic Category geoscientificInformation oceans Data Categories for Marine Planning Bathymetry and Elevation USGS Thesaurus sub-bottom profiling geospatial datasets marine geophysics Marine Realms Information Bank (MRIB) keywords seismic reflection profiling None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC boomer Geographic Names Information System (GNIS) Pacific Ocean State of California Crescent City City of Eureka Eel River NGA GEOnet Names Server (GNS) Eel Canyon Bear Valley Mattole Canyon Trinidad Canyon None 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 originator of the dataset and in products derived from these data. 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 https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P950276G/094b4e9245bf404aa708ffe563ba67ee/W196NC_indexmap.png Index map of track lines PNG Affiliate investigators: Michael E. Field, James V. Gardner, and John Gann (all USGS) SEG-Y Rev 1 Diane L. Minasian Homa J. Lee Jaques Locat Kevin M. Orzech Gregory R. Martz Kenneth Israel 2001 Minasian, Diane L., Lee, Homa J., Locat, Jaques, Orzech, Kevin M., Martz, Gregory R., Israel, Kenneth, 2001, The STRATAFORM Project: U.S. Geological Survey Geotechnical Studies: U.S. Geological Survey Open-File Report 01-190, https://pubs.usgs.gov/of/2001/0190/. https://pubs.usgs.gov/of/2001/0190/ Identified as best available version. Subbottom data were collected during USGS cruise W-1-96-NC using a Huntec Hydrosonde Deep-Tow system. Quality control was conducted during the collection process. 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. Position data were provided by a Global Postitioning System (GPS) navigation receiver. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. Depths shown in the seismic data files are in milliseconds (round trip travel time) and are referenced to sea level. Boomer seismic-reflection data were obtained using a Huntec Deep Tow System. The Huntec Deep Tow System is a boomer mounted on a sled towed 25–100 m deep. The system has two receivers, an internal hydrophone and an external 10-element, 5-m hydrophone streamer. At the maximum energy of 550 J, the system produces a source bandwidth of ~0.6–6 kHz centered at 3.5 kHz. collection 19960707 Boomer sub bottom profiles were processed using Echos by Paradigm seismic software. Channel 1 was used and the deep-water delay trace header values (byte 109 DWD) were applied and record length extended. UTM zone 10N navigation was written to header bytes 73 and 77. processing 20190201 Corrections made to URLs in metadata, which were still pointing to the development site. No data were changed. (scochran@usgs.gov) 20200422 Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Horizontal X and Y locations for the seismic profile locations are provided in ASCII position files and are stored in the SEG-Y data trace headers in header bytes 73 and 77. WGS 1984 UTM Zone 10N 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.0001 0.0001 Meter D WGS 1984 WGS 1984 6378137.0 298.257223563 Local surface 0.1 meters Attribute values Navigation and seismic shots with time stamp in standard SEG-Y file format Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards] U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission Street

Santa Cruz CA 95060 1-831-427-4747 pcmsc_data@usgs.gov W196NC-boomer-sgy.zip This zip file contains boomer sub-bottom (SEG-Y) data collected during USGS field activity W-1-96-NC. These data are divided up and presented by navigation line, as reflected in the individual file names. 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. SEG-Y SEG-Y rev 1 Zip file contains the processed seismic data per navigation line Winzip, 7-zip, or Winrar are free software that will open .zip files 658.2 https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P950276G/dd52818abf5b47809f8f682cece00ddb/W196NC-boomer-sgy.zip https://doi.org/10.5066/P950276G Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data and metadata. The second link points to a landing page for the data release. None. Use of SEG-Y data requires specialized software, such as ProMax and Seisworks by Landmark Geophysical; FOCUS and SeisX by Paradigm Geophysical; SPW by Parallel Geoscience; VISTA by Seismic Image Software; SeiSee by Dalmorneftegeophysica (DMNG); amongst others. 20201019 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