Alicia F. Balster-Gee Patrick E. Hart Ray W. Sliter Thomas E. Parsons 20200422 seismic-reflection data in SEG-Y format data release DOI:10.5066/P92R2I8J Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P92R2I8J https://www.sciencebase.gov/catalog/file/get/5e71021fe4b01d5092682261 Alicia F. Balster-Gee Patrick E. Hart Ray W. Sliter Thomas E. Parsons 2020 data release DOI:10.5066/P92R2I8J Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P92R2I8J Multichannel minisparker and boomer seismic-reflection data were collected by the U.S. Geological Survey in September of 2013 in Port Valdez, Alaska. Data were collected aboard the USGS R/V Alaskan Gyre during field activity G-01-13-GA, using a 500-Joule SIG 2-mille minisparker or an Applied Acoustics triple plated S-Boomer sound source and a 24-channel Goemetrics hydrophone streamer. Sub-bottom acoustic penetration spans several hundreds of meters and is variable by location. High-resolution multichannel seismic-reflection data were acquired to support the U.S. Geological Survey Alaska coastal and marine hazards project to explore the sedimentary structure of tsunamigenic landslide deposits around an IODP drill site in Port Valdez. 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=G0113GA 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. 20130903 20130913 ground condition at time data were collected Complete None planned -146.850361 -145.923748 61.248782 60.939989 USGS Metadata Identifier USGS:5e71021fe4b01d5092682261 ISO 19115 Topic Category geoscientificinformation oceans Data Categories for Marine Planning Substrate Distributions USGS Thesaurus sub-bottom profiling geospatial datasets marine geophysics Marine Realms Information Bank (MRIB) keywords seismic reflection profiling seabed acoustic methods mapping geophysics 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) Gulf of Alaska State of Alaska Port Valdez Valdez Valdez Arm Lowe River Shoup Bay NGA GEOnet Names Server (GNS) North Pacific Ocean 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://www.sciencebase.gov/catalog/file/get/5e71021fe4b01d5092682261?name=G-01-13-GA_mcs_trackline_map.png&allowOpen=true G-01-13-GA MCS trackline map PNG We thank Peter Haeussler, Emily Roland, Rob Wesson, Chuck Worley, John Childs, Rob Wyland, Pete Dal Ferro, Jackson Currie, and Holly Ryan for assistance with survey planning and data acquisition. SEG-Y rev 1 Identified as best available version. No formal logical accuracy tests were conducted but quality control was conducted during data acquisition. 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. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. A formal accuracy assessment of the vertical positional information in the data set has not been conducted. Multichannel minisparker (MCS) and boomer seismic-reflection data were collected aboard the USGS R/V Alaskan Gyre using either a 500-Joule SIG 2-mille minisparker or an Applied Acoustics triple plated S-Boomer sound source and recorded using a 24-channel, 150-meter Geometrics digital hydrophone streamer. Source is noted as either boomer or minisparker in the SEG-Y file names within the zip file. Data were sampled at 125 microseconds. Processing steps included; conversion from SEGD to SEGY, geometry assignment, 80-800Hz bandpass filter, CDP sort, application of a spherical divergence gain, Normal Moveout at water velocity, stack, trace balancing, post stack time migration at water velocity and navigation conversion to UTM zone 6N (header bytes 81 and 85). 20131110 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 6N 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 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 Zip file contains mcs seismic-reflection (SEG-Y) data collected during USGS field activity G-01-13-GA. Data are presented by navigation line. 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 mcs seismic data per navigation line Winzip, 7-zip, or Winrar are free software that will open .zip files 987 https://www.sciencebase.gov/catalog/file/get/5e71021fe4b01d5092682261 https://www.sciencebase.gov/catalog/item/5e71021fe4b01d5092682261 https://doi.org/10.5066/P92R2I8J Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data, metadata, and a trackline map. The second link points to a landing page with the data, metadata, and trackline map. The third link points to a 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