Metadata: Identification_Information: Citation: Citation_Information: Originator: Arnell S. Forde Publication_Date: 20221018 Title: Archive of Chirp Subbottom Profile, Imagery, and Geospatial Data Collected in 2015 Offshore of Dauphin Island, Alabama Geospatial_Data_Presentation_Form: SEG-Y, tabular, vector, and raster digital data Larger_Work_Citation: Citation_Information: Originator: Arnell S. Forde Originator: James G. Flocks Originator: Stanley D. Locker Publication_Date: 20221018 Title: Archive of Chirp Subbottom Profile Data Collected in 2015 From Dauphin Island, Alabama Series_Information: Series_Name: U.S. Geological Survey data release Issue_Identification: doi:10.5066/P9YTIG6G Publication_Information: Publication_Place: St. Petersburg, Florida Publisher: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Online_Linkage: https://doi.org/10.5066/P9YTIG6G Description: Abstract: From September 16 through 23, 2015, researchers from the U.S. Geological Survey (USGS) conducted an offshore geophysical survey to map the shoreface and determine Holocene stratigraphy near Dauphin Island, Alabama (AL). The Alabama Barrier Island Restoration Feasibility Study project objective includes the investigation of nearshore geologic controls on surface morphology. This publication serves as an archive of high-resolution chirp subbottom trace data, survey trackline map, navigation files, geographic information system (GIS) data, and formal Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Processed subbottom profile images are also provided. The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG-Y revision 0 format (Barry and others, 1975). In addition to this data release, the SEG-Y files can be downloaded from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov. Coastal multibeam bathymetry and sidescan sonar data were collected and processed for this project by the U.S. Army Corps of Engineers (USACE). Purpose: The purpose of this data release is to archive of digital chirp subbottom profile data and associated files collected during USGS Field Activity Number 2015-330-FA. Additional survey and data details are available from the USGS CMGDS at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-330-FA. Supplemental_Information: Chirp systems use a signal of continuously varying frequency; the system used during this survey produces high-resolution, shallow-penetration (typically less than 75-milliseconds [ms]) profile images of sub-seafloor stratigraphy. The towfish contains a transducer that transmits and receives acoustic energy and is typically towed 1–2 meters (m) below the sea's surface. As transmitted acoustic energy intersects density boundaries, such as the seafloor or sub-surface sediment layers, energy is reflected toward the transducer, received, and recorded by a PC-based seismic acquisition system. This process is repeated at regular intervals (for example, 0.125 seconds [s]) and returned energy is recorded for a specific duration (for example, 50 ms). In this way, a two-dimensional (2D) image of the shallow geologic structure beneath the towfish is produced. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20150916 Ending_Date: 20150923 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -88.328428 East_Bounding_Coordinate: -88.040933 North_Bounding_Coordinate: 30.247492 South_Bounding_Coordinate: 30.158725 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:1a930493-a788-4e85-b03c-843f96197369 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: oceans Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: sub-bottom profiling Theme_Keyword: marine geology Theme_Keyword: geology Theme_Keyword: coastal processes Theme_Keyword: navigational data Theme_Keyword: geospatial datasets Theme_Keyword: field activity logs Theme_Keyword: image collections Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: distributions Theme_Keyword: physical habitats and geomorphology Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords Theme_Keyword: seismic reflection profiling Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: seismic reflection Theme_Keyword: chirp Theme_Keyword: Society of Exploration Geophysicists Theme_Keyword: SEG-Y Theme_Keyword: barrier island mapping Theme_Keyword: 2015-330-FA Place: Place_Keyword_Thesaurus: Common Geographic Areas Place_Keyword: Little Dauphin Island Place_Keyword: Alabama Place_Keyword: Mobile Bay Place_Keyword: Gulf of Mexico Access_Constraints: None. These data are held in the public domain. Use_Constraints: Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of the data in future products or derivative research. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Arnell S. Forde Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: Saint Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: aforde@usgs.gov Data_Set_Credit: Funding and (or) support for this study were provided by the USGS Coastal and Marine Hazards and Resources Program. The authors thank Captains Fred Roberts and Reid Boa of the USACE for their assistance in data collection and piloting the Research Vessel (R/V) Irvington. This document was improved by scientific/editorial and metadata reviews from Julie Bernier and Breanna Williams of the St. Petersburg Coastal and Marine Science Center. Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft Windows 10 Version 6.2 (Build 9200); Environmental Systems Research Institute (Esri) ArcMap 10.7.1.11595; Seismic Unix (Release 44). Cross_Reference: Citation_Information: Originator: Barry, K.M. Originator: Cavers, D.A. Originator: Kneale, C.W. Publication_Date: 1975 Title: Recommended standards for digital tape formats Series_Information: Series_Name: Geophysics Issue_Identification: v. 40, no. 2 Other_Citation_Details: pages 344-352 Online_Linkage: https://doi.org/10.1190/1.1440530 Cross_Reference: Citation_Information: Originator: Cohen, J.K. Originator: Stockwell, J.W., Jr. Publication_Date: 2010 Title: Seismic Un*x Release No. 44: An open source software package for seismic research and processing Publication_Information: Publication_Place: Golden, Colorado Publisher: Center for Wave Phenomena, Colorado School of Mines Online_Linkage: https://github.com/JohnWStockwellJr/SeisUnix Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The validity or accuracy of marine subbottom profiles is highly qualitative and dependent on equipment and operating condition variables. Logical_Consistency_Report: These datasets are from one field activity with consistent instrument calibrations. Completeness_Report: A total of 118 seismic lines were collected during this field activity. Line JD-264.01 was corrupted during acquisition; JD-260, JD-264.003, and 2015-330-FA were partial lines (< 1 megabyte [MB]) containing no usable data; lines 2015-330-FA.001 and 2015-330-FA.002 were test lines. All of the aforementioned lines were excluded from this data release (Forde and others, 2022). Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: As the subbottom profile data were acquired, the position of the vessel was continuously determined by an Applanix POS MV Wavemaster II inertial aided navigation system (IANS), which is accurate to within 0.5-2 meters (m). To ensure consistent spacing between survey lines acquired aboard the R/V Irvington, pre-determined trackline locations were imported into the vessel's navigation software and followed during seismic data collection. Trimble Differential Global Positioning System (DGPS) provided vessel and chirp navigation. During acquisition, positions from the POS MV IANS were recorded and written to seismic trace headers in arcseconds every 1 second (s) and were subsequently converted to latitude and longitude coordinates (World Geodetic System of 1984, WGS84, realization G1762). The approximately 19-m offset between the chirp shot position and ship's global positioning system (GPS) antenna reference point were not accounted for during acquisition, nor have the American Standard Code for Information Interchange (ASCII) navigation files and trackline map been corrected to reflect the offset. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: These data are not to be used for bathymetry. Two-way travel times (TWT) shown on the printable profile images are relative to the chirp towfish position (below the sea surface), not to the sea surface. Lineage: Process_Step: Process_Description: Chirp acquisition - Subbottom data were acquired from the chirp towfish, which was towed by the 54-foot research vessel R/V Irvington and positioned approximately 1 m below the water surface. The seismic source utilized during 2015-330-FA was an EdgeTech SB-512i running DISCOVER version 4.09 acquisition software and towed directly behind the vessel, approximately 19 m behind the GPS reference point. The data were acquired at 6 hertz (Hz), which equates to a roughly 0.2 s sample interval, using a frequency sweep of 0.7-12 kilohertz (kHz), and recording length was 66.47 ms. Based on survey speeds of about 4 knots, the shot spacing is approximately 0.450 m. The binary portion of the seismic data is stored in SEG-Y rev. 0, IBM 32-bit float [big-endian byte order] format, which is a standard digital format that can be read and manipulated by most seismic processing software packages; the first 3,200 bytes of the file header are in ASCII format instead of Extended Binary Coded Decimal Interchange Code (EBCDIC) format. The SEG-Y formatted trace files have a .sgy extension and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU) (Cohen and Stockwell, 2010). The printable profiles provided are chirp subbottom profile images that were processed using SU software. Survey Field Activity Collection System (FACS) logs and acquisition geometry are also provided as supplemental information in the download file, 2015-330-FA_logs.zip. Process_Date: 20150923 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: James G. Flocks Contact_Organization: U.S. Geological Survey Contact_Position: Research Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: jflocks@usgs.gov Process_Step: Process_Description: Chirp processing - The SEG-Y data were processed with Seismic Unix (Release 44) software to produce gained Graphics Interchange Format (GIF) images of the subbottom profiles included in this data release. A representative chirp data processing sequence consisted of (1) applying a 3000-4000-10,000-12,000 bandpass filter to the analytic data to remove noise from the raw data, prior to creating the envelope seismic data file (corrected files included in this publication have "env_bp" appended to the line name), (2) removing raw [vessel] navigation data for each shot and converting the SEG-Y file to SU format, (3) applying automatic gain control, (4) trimming the trace data TWT to 30 ms (no observable features, aside from multiples, were encountered below that point in the profiles), (5) generating a PostScript image of the traces, and (6) converting the PostScript image to a GIF image. Source_Used_Citation_Abbreviation: *.sgy Process_Date: 20220311 Source_Produced_Citation_Abbreviation: *.gif Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Arnell S. Forde Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: aforde@usgs.gov Process_Step: Process_Description: Navigation acquisition and processing - An Applanix POS MV IANS (positioned amidship) was used for positioning onboard the R/V Irvington. Real-time positions from the POS MV were recorded and written to the seismic trace headers via a RS232 cable running from the POS MV receiver to the topside unit of the chirp system every second. During subbottom processing, location data were extracted from the SEG-Y headers of the processed chirp profiles, using Seismic Unix (Cohen and Stockwell, 2010) software and output as ASCII text files; PROJ.5.1.0 (https://proj.org/) software was used to project WGS84 latitude and longitude coordinates to Universal Transverse Mercator (UTM) northings and eastings (WGS84, Zone 16 North [N], meters). Navigation files for each subbottom line, saved by line number, were concatenated into comma-delimited text files so they could be represented geospatially using Esri ArcGIS software. The final output files are as follows: (1) 2015-330-FA_nav.csv contains unique shotpoint positions (along each line) for the entire survey, (2) 2015-330-FA_1000sht.csv includes the 1,000-shot-interval locations that were generated to correlate shot locations on the trackline map with evenly spaced 1,000-shot index markers along the top of the printable profile images, and (3) 2015-330-FA_sol.csv has the start-of-line locations for each trackline. The concatenated, comma-delimited text files were later imported into ArcMap and saved as either a point or polyline file (in Esri's shapefile format) for use in the map document (.mxd) included in this archive. Source_Used_Citation_Abbreviation: *env_bp.txt Process_Date: 20220311 Source_Produced_Citation_Abbreviation: 2015-330-FA_nav.csv Source_Produced_Citation_Abbreviation: 2015-330-FA_1000sht.csv Source_Produced_Citation_Abbreviation: 2015-330-FA_sol.csv Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Arnell S. Forde Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: aforde@usgs.gov Process_Step: Process_Description: Trackline map creation - 2015-330-FA_location.mxd and associated shapefiles (.shp) were created with Esri ArcMap 10.7 software. The survey navigation file, 2015-330-FA_nav.csv, was imported into ArcMap 10.7.1.11595 and processed using the ArcScript "Points to Line" to create a polyline shapefile of the cruise tracklines called 2015-330-FA_trkln. The 1,000-shot-interval and start-of-line files, 2015-330-FA_1000sht.csv and 2015-330-FA_sol.csv, were imported into ArcMap and saved as point shapefiles. A non-proprietary version of the location map was created by utilizing the ArcToolbox "Map to KML" tool, which converted each layer included in the map document (.mxd) to keyhole markup language (.kml) format prior to them being compressed (zipped) and saved as a .kmz file. The ArcGIS and Google Earth geospatial files provided in this publication are unprojected (geographic coordinates, WGS84). For detailed information about the GIS files provided in this data release, please refer to the individual metadata records (*_metadata.txt and *.shp.xml) accompanying each shapefile and the readme file included in 2015-330-FA_gis.zip. Source_Used_Citation_Abbreviation: 2015-330-FA_nav.csv Source_Used_Citation_Abbreviation: 2015-330-FA_1000sht.csv Source_Used_Citation_Abbreviation: 2015-330-FA_sol.csv Process_Date: 20220322 Source_Produced_Citation_Abbreviation: 2015-330-FA_trkln.shp Source_Produced_Citation_Abbreviation: 2015-330-FA_shots.shp Source_Produced_Citation_Abbreviation: 2015-330-FA_sol.shp Source_Produced_Citation_Abbreviation: 2015-330-FA.kmz Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Arnell S. Forde Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: aforde@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0197878895 Longitude_Resolution: 0.0227703311 Geographic_Coordinate_Units: Decimal Degrees Geodetic_Model: Horizontal_Datum_Name: WGS_1984 Ellipsoid_Name: WGS_84 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 2015-330-FA_nav.csv (954061 data records), 2015-330-FA_1000sht.csv (893 data records), 2015-330-FA_sol.csv (113 data records). Entity_Type_Definition: These files, which are located in 2015-330-FA_nav.zip, represent the September 2015 subbottom navigation data. The attributes described below are for the survey's shotpoint navigation file, 2015-330-FA_nav.csv. For detailed information specific to the ArcGIS data, please see the associated shapefile metadata. Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: UTMX Attribute_Definition: UTM-X coordinate (Zone 16N) Attribute_Definition_Source: Universal Transverse Mercator Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 372146.246 Range_Domain_Maximum: 399816.057 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: UTMY Attribute_Definition: UTM-Y coordinate (Zone 16N) Attribute_Definition_Source: Universal Transverse Mercator Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3336845.782 Range_Domain_Maximum: 3346776.388 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: Line Attribute_Definition: Trackline name Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Line numbers were automatically assigned by the EdgeTech 512i chirp topside unit during data acquisition. The naming convention used for each subbottom line is as follows: xy_env_bp, where 'x' is an alphanumeric identifier indicating a specific trackline (for example, JD-262 or JD-265b), 'y' is a number (such as, .001, .002, etc.) representing a new line if recording was prematurely terminated or reran for quality or acquisition problems, and 'env_bp' denotes that the seismic traces were output as an envelope and a bandpass filter was applied. Attribute: Attribute_Label: Shot Attribute_Definition: Shotpoint number Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 33113 Attribute: Attribute_Label: Lon Attribute_Definition: Longitude (decimal degrees) Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -88.328428 Range_Domain_Maximum: -88.040933 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Lat Attribute_Definition: Latitude (decimal degrees) Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 30.158725 Range_Domain_Maximum: 30.247492 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: YEAR Attribute_Definition: Year of data acquisition Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2015 Range_Domain_Maximum: 2015 Attribute: Attribute_Label: DOY:HR:MIN:SEC Attribute_Definition: Day of year:hour:minute:second Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Day of year, hour, minute and second of data acquisition, in Coordinated Universal Time (UTC). Overview_Description: Entity_and_Attribute_Overview: Navigation file: Navigation files are available as ASCII delimited text files in comma-separated values (CSV) file format. The final navigation files are provided in 2015-330-FA_nav.zip (Forde and others, 2022) and represent the reprojected survey shotpoint navigation, 1,000-shot-interval locations, and start of line files. Entity_and_Attribute_Overview: Binary data file: Seismic trace data are available as binary files in SEG-Y format (113 files). These files have a .sgy extension and range in size from 1.8 to 70.8 MB. These data are included in the download file, 2015-330-FA_segy.zip, and can also be found by going to the USGS CMGDS at, https://cmgds.marine.usgs.gov. The SEG-Y rev. 0 format (Barry and others, 1975) data presented here consists of the following: a 3,600-byte reel identification header, with the first 3,200 bytes consisting of an ASCII header block followed by a 400-byte binary header block, both of which include information specific to line and reel number; a trace data block that follows the reel identification header, with the first 240 bytes of each trace block consisting of the binary trace identification header; and seismic data samples that follow the trace identification header. Entity_and_Attribute_Overview: Graphic image file: Printable versions of the processed subbottom profiles are available as GIF images (113 files) and are included in the download file, 2015-330-FA_seisimag.zip. Entity_and_Attribute_Overview: GIS file: The GIS data associated with this survey are provided as a compressed zip file, 2015-330-FA_gis.zip, which is composed of an Esri map document, shapefiles, individual shapefile metadata, a Google Earth KMZ file, a folder of processed subbottom profile images, and a readme file. Entity_and_Attribute_Detail_Citation: The entity and attribute information were generated by the individual and/or agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Arnell S. Forde Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: aforde@usgs.gov Contact_Instructions: The SEG-Y files included in this data release are also downloadable from the Coastal and Marine Geoscience Data System at, https://cmgds.marine.usgs.gov. Distribution_Liability: This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: SEG-Y Format_Version_Number: Revision 0 Format_Information_Content: The ZIP file contains the SEG-Y data and support information. File_Decompression_Technique: Winzip or 7zip Transfer_Size: 2210 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P9YTIG6G/data/2015-330-FA_segy.zip Digital_Form: Digital_Transfer_Information: Format_Name: Comma-delimited ASCII Format_Information_Content: The ZIP file contains the survey navigation data and support information. File_Decompression_Technique: Winzip or 7zip Transfer_Size: 4.8 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P9YTIG6G/data/2015-330-FA_nav.zip Digital_Form: Digital_Transfer_Information: Format_Name: Shapefile, MXD, KMZ, GIF Format_Information_Content: The ZIP file contains the survey navigation data represented geospatially as GIS files (shapefile, MXD, KMZ), a folder of processed subbottom profile images (GIF, accessible via hyperlinks included in the MXD), and supporting information. File_Decompression_Technique: Winzip or 7zip Transfer_Size: 113.1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P9YTIG6G/data/2015-330-FA_gis.zip Digital_Form: Digital_Transfer_Information: Format_Name: GIF Format_Information_Content: The ZIP file contains images of the processed subbottom profile data and support information. File_Decompression_Technique: Winzip or 7zip Transfer_Size: 110.2 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P9YTIG6G/data/2015-330-FA_seisimag.zip Fees: None Technical_Prerequisites: Use of SEG-Y data requires specialized seismic processing software, such as public domain software Seismic Unix (https://github.com/JohnWStockwellJr/SeisUnix). Metadata_Reference_Information: Metadata_Date: 20220912 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Arnell S. Forde Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: aforde@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998