Alicia F. Balster-Gee Daniel S. Brothers Emily C. Roland Jared W. Kluesner Patrick E. Hart James E. Conrad Emma K. Myers Daniel R. Ebuna Joel H. Edwards 20200327 seismic-reflection data in SEG-Y format data release DOI:10.5066/P9BLAJ72 Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9BLAJ72 https://www.sciencebase.gov/catalog/file/get/5e42eb9ee4b0edb47be84547 Alicia F. Balster-Gee Daniel S. Brothers Emily C. Roland Jared W. Kluesner Patrick E. Hart James E. Conrad Emma K. Myers Daniel R. Ebuna Joel H. Edwards 2020 data release DOI:10.5066/P9BLAJ72 Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P9BLAJ72 This data release contains 41 chirp sub-bottom profiles that were collected in February of 2016 from the Catalina Basin offshore southern California by the U.S. Geological Survey Pacific and Coastal Marine Science Center in cooperation with the University of Washington. Data were collected aboard the University of Washington’s R/V Thomas G. Thompson on USGS cruise 2016-616-FA. Chirp profiles were collected to image the Catalina and San Clemente fault systems as well as the San Gabriel Canyon system. Data were acquired to support USGS geologic hazards projects to aide hazard assessment of southern California’s offshore Catalina and San Clemente fault zones. Data collection was funded by UW Student Ship Funds. High-resolution multichannel seismic-reflection data, high-resolution multibeam bathymetry, and backscatter data (Dartnell and others, 2017) were collected coincidentally. 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: https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-616-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. 20160222 20160226 ground condition at time data were collected Complete None planned -119.13 -118.10986328 33.69320931 32.642971 USGS Metadata Identifier USGS:5e42eb9ee4b0edb47be84547 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 continental Margin None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC chirp Geographic Names Information System (GNIS) Pacific Ocean State of California Santa Catalina Island San Clemente Island San Nicolas Island Sant Barbara Island Two Harbors Avalon City of Long Beach City of San Diego City of Encinitas City of Huntington Beach Santa Barbara Channel Gulf of Santa Catalina NGA GEOnet Names Server (GNS) Catalina Basin Emery Knoll Catalina Canyon Catalina Escarpment Osborn Bank 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 and the University of Washington as the originators 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://www.sciencebase.gov/catalog/file/get/5e42eb9ee4b0edb47be84547?name=2016-616-FA_chirp_trackline_map.png&allowOpen=true Chirp track line map PNG SEG-Y Rev 1 Peter Dartnell Emily C. Roland Daniel Brothers James E. Conrad Nicole A. Raineault Renato R. Kane Christopher M. Castillo Jared W. Kluesner Maureen A.L. Walton 2017 Dartnell, P., Roland, E.C., Raineault, N.A., Castillo, C.M., Conrad, J.E., Kane, R.R., Brothers, D.S., Kluesner, J.W., Walton, M.A.L., 2017, Multibeam bathymetry and acoustic-backscatter data collected in 2016 in Catalina Basin, southern California and merged multibeam bathymetry datasets of the northern portion of the Southern California Continental Borderland: U.S. Geological Survey data release, https://doi.org/10.5066/F7DV1H3W https://doi.org/10.5066/F7DV1H3W Identified as the best available version Chirp subbottom data were collected during USGS field activity 2016-616-FA using a hull-mounted Knudsen 3260/320BR operated with a 3.5kHz sweep at 10KW power. Quality control was conducted during the collection process. Note that the Knudsen auto-water bottom tracker sometimes lost the seafloor and recorded the water column. Delay header can be found in byte 109. 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 Differential Global Positioning System (DGPS) 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. Deep water delay header values are recorded in header byte 109. Knudsen chirp sub-bottom profiles were acquired using a hull-mounted Knudsen 3260/320BR operated with a 3.5kHz sweep at 10KW power. Note that some files are small and only contain a few traces. 20160226 Typo in Longitude of Central Meridian (longcm) tag was corrected. No data were changed. 20200531 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7545 scochran@usgs.gov 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 each seismic profile location are provided in ASCII position files and are stored in the SEG-Y data trace headers in header bytes 81 and 85. WGS 1984 UTM Zone 11N 0.9996 -117.0 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 two-way travel time in milliseconds 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 - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov 2016-616-FA_chirp.zip This zip file contains chirp sub-bottom (SEG-Y) data collected during USGS field activity 2016-616-FA. 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 raw seismic data per navigation line. Winzip, 7-zip, or Winrar are free software that will open .zip files 968.41 https://www.sciencebase.gov/catalog/file/get/5e42eb9ee4b0edb47be84547 https://www.sciencebase.gov/catalog/item/5e42eb9ee4b0edb47be84547 https://doi.org/10.5066/P9BLAJ72 Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of chirp data and metadata. The second link points to a landing page with the chirp data, metadata, and a browse image of the tracklines. The third link points to the landing page for the entire data release. None. Use of SEG-Y data requires specialized software, such as Reveal by Shearwater Geophysical; 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