Metadata: Identification_Information: Citation: Citation_Information: Originator: Alicia F. Balster-Gee Originator: Daniel S. Brothers Originator: Jared W. Kluesner Originator: Nathan C. Miller Originator: Peter J. Haeussler Originator: Thomas F. O’Brien Originator: Rachel K. Marcuson Originator: Patrick E. Hart Originator: James E. Conrad Originator: Maureen L. Walton Originator: Alex R. Nichols Publication_Date: 20221223 Title: Multichannel sparker seismic reflection data collected offshore southeast Alaska during USGS Field Activity 2017-621-FA Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9QXL00L Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9QXL00L Larger_Work_Citation: Citation_Information: Originator: Alicia F. Balster-Gee Originator: Daniel S. Brothers Originator: Jared W. Kluesner Originator: Nathan C. Miller Originator: Peter J. Haeussler Originator: Thomas F. O’Brien Originator: Rachel K. Marcuson Originator: Patrick E. Hart Originator: James E. Conrad Originator: Maureen L. Walton Originator: Alex R. Nichols Publication_Date: 2022 Title: Multichannel sparker and chirp seismic reflection data collected offshore southeast Alaska during USGS Field Activity 2017-621-FA Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9QXL00L Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9QXL00L Description: Abstract: High-resolution multichannel seismic reflection data were collected by the U.S. Geological Survey in July and August 2017 offshore southeast Alaska to expand data coverage along the Queen Charlotte Fault system. Purpose: This dataset contains processed multichannel seismic-reflection SEG-Y data collected by the U.S. Geological Survey during field activity 2017-621-FA. Data were acquired to study earthquake hazards, fault mechanics and submarine mass wasting processes along the Queen Charlotte fault system, a 1200 km long transform boundary that separates the Pacific and North American tectonic plates. These data are intended for science researchers, students from elementary through college, policy makers, and general public. Supplemental_Information: Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-621-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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20170627 Ending_Date: 20170726 Currentness_Reference: ground condition at time data were collected Status: Progress: In work Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -138.07189 East_Bounding_Coordinate: -136.86450 North_Bounding_Coordinate: 58.54134 South_Bounding_Coordinate: 57.73123 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:d87e804a-34ae-4623-bbc8-ce639f40832f Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Theme_Keyword: location Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: substrate Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: marine geophysics Theme_Keyword: geospatial datasets Theme_Keyword: sub-bottom profiling Theme_Keyword: marine geophysics Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: seismic methods Theme_Keyword: seismic reflection profiling Theme_Keyword: data processing Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: field activity number 2017-621-FA Theme_Keyword: seismic navigation Theme_Keyword: seismic reflection Theme_Keyword: SEG-Y traces Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Pacific Ocean Place_Keyword: State of Alaska Place_Keyword: Palma Bay Place_Keyword: Yakobi Island Place_Keyword: Glacier Bay National Park and Preserve Place_Keyword: Graves Harbor Place: Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS) Place_Keyword: Alexander Archipelago Place_Keyword: Cross Sound Access_Constraints: None Use_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 originator of the dataset and in products derived from these data. This information is not intended for navigation purposes. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: 2017-621-FA_mcs_trackline_map.png Browse_Graphic_File_Description: Map of multichannel sparker seismic reflection profiles acquired during USGS field activity 2017-621-FA. Browse_Graphic_File_Type: PNG Data_Set_Credit: The authors acknowledge the crew of the R/V Ocean Starr and everyone involved in survey planning and execution. Native_Data_Set_Environment: MCS data were recorded in SEG-D rev. 2.1 format (https://seg.org/Portals/0/SEG/News%20and%20Resources/Technical%20Standards/seg_d_rev2.1.pdf) using Geometrics CNT-1 seismic acquisition software (version 5.64). Seismic data were recorded with a 450-meter 72-channel liquid GeoEel streamer with three Geospace depth control birds positioned at channels 8, 41, and aft of channel 72. An Applied Acoustics Delta Sparker (https://www.subseatechnologies.com/applied-acoustics/sub-bottom-profiling/sound-source-sparker/delta-sparker/) powered between 1.2 and 12 kilojoules was used as the sound source. Shearwater Reveal (v. 2021, https://www.shearwatergeo.com/4/reveal-software) software was used to process the data as described in the processing steps below. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Quality control was conducted during acquisition. Some seismic profiles have gaps in them due to system crashes, or intentional shutdowns as required under terms of our operating permit to protect marine mammals. Logical_Consistency_Report: Quality control was conducted during acquisition and processing to ensure consistency of SEG-Y header navigation and seismic-reflection data that matches bathymetry along the tracklines. Completeness_Report: 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. Data release will be updated with additional SEG-Y profiles as data are processed. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: +/- 0.6m 95 percent confidence (DGPS) (http://dev.wr.usgs.gov/idb/media/service_materials/2022/12/07/101121522789/Hemisphere_V100specsheet.pdf) Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Two-way travel time in milliseconds is recorded in SEG-Y files. Lineage: Process_Step: Process_Description: Raw SEG-D format seismic shots were imported into Shearwater Reveal seismic software for processing. Navigation data were converted to UTM zone 8N and offset geometry was calculated, and common midpoint (CMP) were binned at 3.125-meter intervals. The following processing steps were applied; 50-Hz highpass Butterworth filter, 40-50-900-1100Hz bandpass filter, FK amplitude coherence enhancement, despike, top mute, FK filter, velocity semblance analysis, normal moveout, two passes of pre-stack deconvolution, 60-80-900-1000Hz bandpass filter, trim statics, median gather filter, stack, bottom mute, trace kills, phase shift time migration at 1400m/s, post migration spiking deconvolution, and 200ms automatic gain control application. Processed data were exported to SEG-Y format with standard header byte locations. Common Midpoint (CMP) X and Y navigation points are written to header bytes 181 and 185 in UTM zone 8N coordinates. SEG-Y data files were compressed into the zip file 2017-621-FA.mcs.segy.zip. Process_Date: 20221114 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 7 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: WGS 1984 UTM Zone 8N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -135.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.0001 Ordinate_Resolution: 0.0001 Planar_Distance_Units: Meter Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Zip archive of seismic traces with Time Stamp in standard SEG-Y file format Entity_and_Attribute_Detail_Citation: Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - CMGDS Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: SEG-Y data are available in the zip file 2017-621-FA.mcs.segy.zip that contains seven standard SEG-Y format files of seismic traces with time stamp (Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards). Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: SEG-Y Format_Version_Number: SEG-Y rev 1 Format_Information_Content: Zip file contains the processed seismic data per navigation line. File_Decompression_Technique: The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip). Transfer_Size: 534.8 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P9QXL00L Access_Instructions: Data zip file (2017-621-FA.mcs.segy.zip) can be downloaded using the Network_Resource_Name link and scrolling to the sparker data section. Fees: None. Technical_Prerequisites: 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. Metadata_Reference_Information: Metadata_Date: 20221223 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998