Metadata: Identification_Information: Citation: Citation_Information: Originator: Alicia F. Balster-Gee Originator: Daniel S. Brothers Originator: Christopher B. DuRoss Originator: Jared W. Kluesner Originator: Daniel C. Powers Originator: Jackson E. Currie Originator: Peter Dal Ferro Originator: Jessica A. Jobe Publication_Date: 20250904 Title: Chirp sub-bottom data collected in the Great Salt Lake, Utah, during USGS field activity 2021-615-FA Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P13FCNPJ Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: Balster-Gee, A.F., Brothers, D.S., DuRoss, C.B., Kluesner, J.W., Powers, D.C., Currie, J.E., Dal Ferro, P., Jobe, J.A., 2025, Chirp sub-bottom data collected in the Great Salt Lake, Utah during USGS field activity 2021-615-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P13FCNPJ. Online_Linkage: https://doi.org/10.5066/P13FCNPJ Description: Abstract: This data release contains 57 high-resolution chirp sub-bottom profiles collected in the southern Great Salt Lake, Utah. Data were collected by the U.S. Geological Survey (USGS) in June of 2021 during USGS field activity 2021-615-FA. Purpose: This high-resolution sub-bottom dataset was acquired in the Great Salt Lake, Utah, to investigate paleoseismic evidence associated with the Great Salt Lake Fault. The dataset aims to image subsurface sedimentary structures and stratigraphy to identify and characterize past earthquake events, contributing to a better understanding of the fault’s seismic history, recurrence intervals, and associated geohazards in the region. Supplemental_Information: Additional information about the field activity or activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-615-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20210619 Ending_Date: 20210702 Currentness_Reference: Ground condition at the time data were collected. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -112.482800239 East_Bounding_Coordinate: -112.183759519 North_Bounding_Coordinate: 41.120925762 South_Bounding_Coordinate: 40.747385234 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:68a39c7a-876d-4666-8540-adb177db983c 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: sub-bottom profiling Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: data processing Theme_Keyword: seismic reflection profiling Theme_Keyword: Global Positioning System (GPS) observations 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: Earthquake Hazards Program Theme_Keyword: EHP Theme_Keyword: Department of the Interior Theme_Keyword: DOI Theme_Keyword: field activity number 2021—615-FA Theme_Keyword: seismic reflection Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: State of Utah Place_Keyword: Great Salt Lake Access_Constraints: No access constraints 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. These data are marked with a Creative Common CC0 1.0 Universal License. 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: 2021-615-FA.GreatSaltLake.chirp.preview.png Browse_Graphic_File_Description: Map of chirp sub-bottom tracklines in the southern Great Salt Lake. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Field seismic data was collected with EdgeTech Discover acquisition software. Chirp lines 1-25 were acquired with and EdgeTech 424 subbottom profiler and lines 26-42 were acquired with an EdgeTech 216 subbottom profiler.Data were processed using Shearwater Reveal (v. 5.1) on a CentOS Linux 7 operating system. Seismic trackline navigation was processed using QGIS Desktop (v. 3.40.8) on a Windows 10 operating system. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Quality control of attribute accuracy was conducted during field data collection and processing workflows. Some seismic profiles have gaps in them due to system crashes. Minor swell correction artifacts exist at line starts and ends as well as in areas where lake floor amplitudes are low. 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: The 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: An Applanix POS-MV (Position and Orientation System for Marine Vessels) Elite was used to position the source vessel during data collection. The Applanix POS-MV Elite has a stated positional accuracy of 0.5-2 meters (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-ELITE.pdf). Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include the position and motion compensation system and navigation error. Lineage: Process_Step: Process_Description: Raw SEG-Y format seismic shots were imported into Shearwater Reveal 5 (seismic software), and navigational data was converted to UTM zone 12N and stored in header bytes 81 and 85 with a -1000 scalar (scalar recoded in header byte 71). Further processing included transforming to envelope, applying water column and bottom mute, and performing swell correction using the peak trace amplitude time-averaged over the swell period (typically between 21 and 55 traces). Sometimes, two passes of swell correction were required when there were mixed swell periods. SEG-Y files were named ###.swell.segy, where ### is the line number. SEG-Y files were zipped into the file 2021-615-FA.GreatSaltLake.chirp.data.zip. Process_Date: 20250716 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: 57 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 12 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -111.0 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 Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Seismic Shots 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: These data are available in SEG-Y format (###.swell.segy where ### is the line number) and are contained in a single zip file (2021-615-FA.GreatSaltLake.chirp.data.zip) accompanied by CSDGM FGDC-compliant metadata. 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: 8400 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P13FCNPJ Access_Instructions: Data can be downloaded using the Network_Resource_Name link and scrolling down to the Seismic 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: 20250904 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