Blake F. Smullen Arnell S. Forde James G. Flocks 20260610 SEG-Y, tabular, and raster digital data Blake F. Smullen Arnell S. Forde James G. Flocks 20260610 U.S. Geological Survey data release doi:10.5066/P1V6EDD5 St. Petersburg, Florida U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center https://doi.org/10.5066/P1V6EDD5 The U.S. Geological Survey (USGS) Coastal and Marine Hazards and Resources Program has actively collected geophysical and sedimentological data in the northern Gulf of America (Gulf of Mexico) for several decades, including shallow subsurface data in the form of high-resolution seismic reflection profiles (HRSP). Prior to the mid-1990s most HRSP data were collected in analog format as paper rolls of continuous profiles up to 25 meters long. As part of the National Geological and Geophysical Data Preservation Program (NGGDPP, https://www.usgs.gov/programs/national-geological-and-geophysical-data-preservation-program) scientists from the USGS St. Petersburg Coastal and Marine Science Center converted analog paper records to digital format using a large-format continuous scanner. The scanned image files were subsequently processed to fix distortions and crop out blank spaces prior to exporting them as industry standard Society of Exploration Geophysicists (SEG-Y) data exchange formatted files. This data release serves as an archive of HRSP profiles annotated with header information, converted SEG-Y files, navigation data, profile trackline files, and survey logbook. The HRSP data were collected between August 12 and August 19, 1990, for ERDA90-2, and May 15 and May 18, 1991, for MB91-1, using an EG&G Uniboom acoustic (boomer) system, onboard research vessel (R/V) ERDA 1 in Mobile Bay and into the Gulf of America. Data conversion methods are described in USGS Data Series 1047 (Bosse and others, 2017). The data release associated with this metadata record serves as an archive of ERDA90-2 and MB91-1 geophysical, navigational, and support data collected between August 12 and August 19, 1990, and May 15 and May 18, 1991, respectively. This data release is part of an ongoing USGS data rescue effort to preserve geologic data that facilitates easier access to legacy datasets by scientists and the public. The USGS-St. Petersburg Coastal and Marine Science Center (SPCMSC) currently holds 13 major geophysical surveys from the northern Gulf of America in its paper repository. Over 2,000 line-kilometers (km) of data are available. Paper copies of data are difficult and expensive to duplicate and share with other facilities and cannot be analyzed using standard geographic information systems (GIS) and interpretative software. Conversion of this data into a usable digital format is necessary to archive the geologic information that otherwise might be lost, requiring additional redundant and expensive marine geophysical surveys. The USGS National Geological and Geophysical Data Preservation Program (NGGDPP) addresses the need to preserve, catalog, and provide access to geological and geophysical data for scientific research and economic development. In addition to the current efforts under the NGGDPP, four geophysical investigations from the 1980s and 1990s were previously archived through a preservation project in collaboration with the Bureau of Ocean Energy Management (Harrison and others, 2007; Sanford and others, 2009a, b, c). The USGS-SPCMSC scans its analog HRSP holdings using a large-format continuous scanner. The analog to digital conversion process used for this dataset is similar to the processes used previously in Harrison and others (2007) and Sanford and others (2009a, b, c). The digital files were converted into Tagged Image File Format (TIFF) for standard accessibility by raster image processors. The TIFF images of the seismic profiles were also converted into SEG-Y format. This standard non-proprietary format is the accepted industry standard for seismic data and can be accessed by all major seismic data processing and interpretation systems. Accompanying the HRSP are navigation and metadata files, which are generated for use in GIS, database and Internet Message Access Protocol (IMAP) services. Processed seismic profile images are also provided. The processed profiles provided in this data release are Portable Document Format (.pdf) and Portable Network Graphics (.png) images that were created using Seismic Unix and/or ImageMagick software. The northern Gulf of America is a passive continental margin, where minimal structural change to the shallow stratigraphy has occurred during the last few thousand years (Anderson and others, 2004). Therefore, subsurface data collected from this environment for the purposes of geologic assessment can be considered useful in perpetuity. The geologic information collected by the USGS in the northern Gulf remains a valuable resource for sea floor and stratigraphic investigations and is continuously revisited by researchers interested in Holocene and recent earth processes. For example, decades-old geologic data are commonly used in sediment resource studies in coastal Louisiana (Kindinger and others, 2001; Kulp and others, 2002; Rogers and others, 2009) and previously collected datasets across the Mississippi-Alabama shelf have been used in recent geologic-framework assessments (Roberts and others, 2004; Greene and others, 2007; Flocks and others, 2009). Geophysical data were acquired using an EG&G Uniboom profiler. The transducer was mounted on a towed sled, with a power supply of 300 Joule. Data were recorded using an EPC 4100 recorder, with a bandpass of 0.4- 1.6 kilohertz (kHz). Navigation events, or shots, were recorded using mark events corresponding to approximately 18.75 meter (m) intervals along the preplotted line. Positioning was provided by long-range navigation (LORAN). A hyperbolic radio navigation system was used with an estimated accuracy of +/-0.02 to 0.08 km. Following SPCMSC data management protocols, these surveys were assigned a USGS field activity number (FAN), 1990-306-FA. Additional survey and data detail are available on the Coastal and Marine Geoscience Data System (CMGDS) at https://cmgds.marine.usgs.gov/services/activity.php?fan=1990-306-FA. 19900814 19910518 ground condition Complete None planned -88.1244 -87.7883 30.6487 30.2636 USGS Metadata Identifier USGS:0374c5a3-8854-48dc-ba0b-78f7d707fef2 ISO 19115 Topic Category geoscientificInformation oceans USGS Thesaurus marine geology geology sediment transport ocean processes coastal processes seismic reflection methods None Marine Society of Exploration Geophysicists SEG-Y R/V ERDA Geographic Names Information System (GNIS) Gulf of America Mobile Alabama Mobile Bay No access constraints. Please see 'Distribution Information' for details. These data are marked with a Creative Commons CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. James G. Flocks U.S. Geological Survey Emeritus mailing and physical

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 jflocks@usgs.gov Native_Data_Set_Enviroment: Environment as of Metadata Creation: Microsoft Windows 11 Enterprise Version 23H2; Environmental Systems Research Institute (Esri) ArcGIS Pro 3.4.3; Seismic Unix (Relase 44); Adobe Photoshop Creative Cloud 2024; Microsoft Word for Office 365 version 16. Anderson, J.B., Rodriguez, A., Abdulah, K.C., Fillon, R.H., Banfield, L.A., McKeown, H.A., and Wellner, J.S. 20040101 Society for Sedimentary Geology 79 pages 1-23 https://doi.org/10.2110/pec.04.79.0001 Barry, K.M., Cavers, D.A., and Kneale, C.W. 197504 Geophysics v. 40, no. 2 pages 344-352 https://library.seg.org/doi/pdf/10.1190/1.1440530 Bosse, S.T., Flocks, J.G., and Forde, A.S. 20170421 U.S. Geological Survey Data Series 1047 https://doi.org/10.3133/ds1047 Flocks, J.G., Ferina, N.F., and Kindinger, J.L. 2009 College Station, Texas, Texas A&M University Press 3 pages 157-173 https://muse.jhu.edu/book/1783 Greene, D.L., Jr., Rodriquez, A.B., and Anderson, J.B. 20070201 Journal of Sedimentary Research 77 pages 139-158 https://doi.org/10.2110/jsr.2007.016 Harrison, A.S., Dadisman, S.V., Kindinger, J.L., Morton, R.A., Blum, M.D., Wiese, D.S., and Subino, J.A. 2007 U.S. Geological Survey Data Series 296 https://doi.org/10.3133/ds296 Kindinger, J.L., Flocks, J.G., Kulp, M.A., Penland, P.S., and Britsch, L.D. 2001 U.S. Geological Survey Open-File Report 2001-384 69 pages https://doi.org/10.3133/ofr01384 Kulp, M.A., Howell, P.D., Adiau, S., Penland, P.S., Kindinger, J.L., and Williams, S.J. 2002 Gulf Coast Association of Geological Societies Transactions 52 pages 573-582 https://archives.datapages.com/data/gcags/data/052/052001/0573.htm Roberts, H.H., Fillon, R.H., Kohl, B., Robalin, J.M., and Sydow, J.C. 2004 Society for Sedimentary Geology 79 pages 142-189 https://archives.datapages.com/data/sepm_sp/SP79/Depositional_Architecture_of_the_Lagniappe_Delta.pdf Rogers, B.E., Kulp, M.A., and Miner, M.D. 20090916 Geo-Marine Letters 29 pages 379-394 https://doi.org/10.1007/s00367-009-0162-6 Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G. 2009 U.S. Geological Survey Data Series 429 2009a https://doi.org/10.3133/ds429 Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G. 2009 U.S. Geological Survey Data Series 428 2009b https://doi.org/10.3133/ds428 Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G. 2009 U.S. Geological Survey Data Series 370 2009c https://doi.org/10.3133/ds370 Trabant, P.K. 1984 Dordrecht, Netherlands Springer Netherlands https://doi.org/10.1007/978-94-009-6493-8 The validity or accuracy of boomer seismic profiling data is highly qualitative and depends on equipment and operating condition variables. Visual inspection of the images rendered from the data did not show any major anomalies. For the ERDA90-2 and MB91-1 navigation data files (.csv), the time stamps were 4 hours off the time stamps written on the profiles. Times in the navigation data files were adjusted to match the times written on the profiles. This dataset is from the USGS SPCMSC archive and has consistent instrument calibrations. This dataset is considered complete for the information presented. All analog seismic profiles collected during the original survey, except line 16 in MB91-1, were successfully scanned and converted to digital format. The seismic profiles provide a two-dimensional (2D) representation of the subsurface along the acquisition tracklines. Users are advised to read the rest of the metadata record carefully for additional details. As the seismic reflection data were acquired, the position of the vessel was recorded using a LORAN-A navigation system. The accuracy of the LORAN-A varied from 0.2 to 0.8 kilometer (km). Positions were recorded in latitude and longitude coordinates (in the World Geodetic System of 1984 [WGS84] coordinate system) at various intervals and appear on the seismic profiles as incremental, hand-annotated vertical event marks. Each vertical line represents a 305-meter (m) or 1000-foot (ft) interval. For this cruise, the time between starting and ending times were interpolated. These data are not to be used for bathymetry. Two-way travel (TWT) times shown on the printable profile images are relative to local sea level at the time of data acquisition. Raw data scanning - The seismic data collected from this survey is housed in the USGS SPCMSC archive. The analog boomer data are in the form of 30 centimeter (cm)-wide paper and vellum rolls. The various rolls can be up to 6 m long and contain multiple seismic tracklines. The rolls contain the seismic profile image with pertinent collection characteristics annotated during acquisition, such as shot number and time and may also include environmental conditions and equipment details. Horizontal lines across the profiles represent TWT time in milliseconds (ms), and vertical lines represent navigation fixes acquired and annotated as the survey was underway. The vellum rolls were scanned using NextImage. The lines were then saved at 200 dots per inch (dpi), grey scaled, in TIFF files. Paper and vellum rolls 2025 TIFF Blake F. Smullen U.S. Geological Survey Student Services Contractor mailing and physical address

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 bsmullen@contractor.usgs.gov Image cropping - The scanned TIFF images were imported into Adobe Photoshop (Ps) Creative Cloud 2024 and blank edge areas were cropped out to further reduce file size. For rolls that included more than one line of seismic data, the file was separated into individual lines. Separation was completed by cropping everything except for the line of interest, determined by the raw navigation information, from the original scan and saving it as a new file with its associated line name. The file naming convention is as follows: CruiseID_trackline#_an.tif (for example, ERDA90-2_15_an.tif). It includes the cruise identification (ERDA90-2), and trackline number (sometimes this also includes a subsection letter after the line number for tracklines split between multiple rolls). TIFF 2025 Blake F. Smullen U.S. Geological Survey Student Services Contractor mailing and physical address

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 bsmullen@contractor.usgs.gov Image headers - Each image of the scanned seismic profiles also includes a header with associated information including cruise- and line-specific information and processing details. The header files were created in Microsoft Word for Office 365 version 16, exported as PDF files, appended to the far left of the image frame in Adobe Ps, and then flattened onto the image to reduce file size. 2025 CruiseID_*_an.tif James G. Flocks U.S. Geological Survey Emeritus mailing and physical address

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 jflocks@usgs.gov Correcting scan distortion - Distortion correction was necessary because it was difficult to ensure vellum/paper rolls were fed into the scanner straight. Distortion correction practices occur in Ps and was obtained by placing a guideline over the 0 ms line (water level) on the scan. It was important that horizontal lines were perpendicular to the vertical lines on the scans or the image to SEG-Y conversion will not be accurate. The distortion was corrected by using the Rectangular Marquee Tool in Adobe Ps to select and create a new layer of the distorted area of the scan. A skewed transform was performed, and the corrected images were saved into a new folder without layers (flattened) to reduce file size (Bosse and others, 2017 and Barry and others, 1975). CruiseID_*_an.tif 2025 Blake F. Smullen U.S. Geological Survey Student Services Contractor mailing and physical address

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 bsmullen@contractor.usgs.gov Creation of .csv files - Each cruise has an associated comma-separated values (.csv) file with the date, time (hour, minute, second), latitude, longitude, shot number, associated line, and fix. The .csv files were needed for the creation of the shapefile (.shp). Data for the .csv files were generated using the logbooks and the LORAN-A navigation system. Each shot was logged as a fixed point in Excel then saved and exported as a .csv file. 2025 CruiseID_nav.csv Jim G. Flocks U.S. Geological Survey Emeritus mailing and physical address

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 jflocks@usgs.gov Creation of .shp file - The shapefiles (.shp) were created in ArcGIS Pro using the associated .csv for each cruise. The .csv files were imported into ArcGIS Pro as data tables. The tables were then converted into a point feature class using the "XY Table to Point" geoprocessing tool. Then, the "Points to Line" geoprocessing tool was used to create tracklines for each cruise. Each line was merged into a single feature class. The feature class was then exported to shapefiles using the "Feature Class to Shapefile" tool. 2025 CruiseID_Tracklines.shp Blake F. Smullen U.S. Geological Survey Student Services Contractor mailing and physical address

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 bsmullen@contractor.usgs.gov Image to SEG-Y - The scanned, distortion-corrected images were converted to digital SEG-Y (the .seg file extension was used, which has the same properties as .sgy) format revision 0 (Barry and others, 1975) using the proprietary software ImageToSEGY 2.2 from Chesapeake Technology. The scanned images were opened in ImageToSEGY and the export area was defined by assigning values to the top, bottom, left, and right pixel locations using the imaged water surface (0 milliseconds (ms)), maximum TWT time (for example, 112.5 ms) and raw navigation data for each line. Trace amplitudes in the scanned profiles are represented by pixels, so each pixel becomes a trace sample and the sample rate of the converted SEG-Y version is the record length divided by the number of vertical pixels in the profile. For example, if the profile is 4,435 pixels vertically and the two-way travel time is 112.5 ms, then the sample rate for the SEG-Y file version is 0.000025 seconds (s). The file naming convention is as follows: CruiseID_Trackline#.seg (for example, ERDA_90-2_5.seg). It includes the cruise identification (ERDA90-2) and trackline number (sometimes this also includes a subsection letter after the line number for tracklines split between multiple rolls). A text (.txt file) copy of the data is also published alongside the .seg data using the same file naming convention. CruiseID_*_an.tif 2025 CruiseID_*.seg CruiseID_*.txt Blake F. Smullen U.S. Geological Survey Student Services Contractor mailing and physical address

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 bsmullen@contractor.usgs.gov Seismic processing: The SEG-Y data were processed with Seismic Unix (SU, Release 44) software to produce PDF images of the seismic profiles included in this data release. A representative data processing sequence consisted of (1) converting the SEG-Y file to SU format, (2) applying horizontal (number of traces) and vertical (TWT time) scales and generating a PostScript image of the traces, (3) converting the header file to a PostScript image then merging with the seismic profile image, and (4) converting the merged PostScript image to a .pdf. The file naming convention is as follows: CruiseID_Trackline#_PWS.pdf (for example, MB91-1_5_PWS.pdf). It includes the cruise identification (ERDA90-2), trackline number, and data type (profile with scale [PWS]). A .png copy of the data is also published alongside the .seg data using the same naming convention. CruiseID_*.seg 2025 CruiseID_*_PWS.pdf CruiseID_*_PWS.png James G. Flocks U.S. Geological Survey Research Geologist mailing and physical address

600 4th Street South

St. Petersburg FL 33701 (727) 502-8000 jflocks@usgs.gov Point String 384 0.0197864699 0.0228595953 Decimal degrees D_WGS_1984 WGS_1984 6378137.0 298.257223563 erda_90-2-nav.csv Navigation file (.csv) containing seismic profile data for cruise ERDA90-2. Time stamps in the data file were 4 hours off the time stamps written on the profiles. Times in the data file were adjusted to match the times written on the profiles. USGS j.d. Julian date associated with each shot USGS 226 231 date Date associated with each shot USGS 8/14/1990 8/19/1990 hour Hour value of time that shot was recorded, in 24-hour time format USGS 12 21 min Minute value of time that shot was recorded USGS 00 57 long Longitude degree value of position of vessel when shot was recorded USGS -88.1244 -87.7883 lat Latitude degree value of location of position of vessel when shot was recorded USGS 30.2636 30.6487 shot Shot number USGS Numbers from 1 to 24 followed by a letter (A,B, or C) when the line was interrupted due to a turn, course change, a pause in operations to fix equipment, the end of the tape or paper, or the changing of the event numbers. Lines with shots followed by a letter have the specific causes noted in the logbook. line Line number USGS Numbers from 1 to 24 followed by a letter (A,B, or C) when the line was split into multiple segments mb91-1_nav.csv Navigation file (.csv) containing seismic profile data for cruise MB91-1. Time stamps in the data file were 4 hours off the time stamps written on the profiles. Times in the data file were adjusted to match the times written on the profiles. USGS J.D. Julian date associated with each shot USGS 135 140 Hour Hour value of time that shot was recorded, in 24-hour time format USGS 12 21 Min Minute value of time that shot was recorded USGS 8 17 Sec Second value of time that shot was recorded USGS 0 55 Lat Latitude degree value of location of position of vessel when shot was recorded USGS 30.2210 30.3732 Long Longitude degree value of position of vessel when shot was recorded USGS -88.3284 -87.8200 Line Line number USGS Numbers from 1 to 16 followed by a letter (A) when the line was split into multiple segments Shot Shot number USGS 0 43 ERDA90-2_Tracklines.shp GIS polyline shapefile (.shp) for cruise ERDA90-2. USGS FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Shape type of feature Esri Polyline A line represented by an array of points Esri Shape_Leng Length of line segment in degrees Esri 0.001342 0.157396 line Line number USGS Numbers from 1 to 24. Some line numbers are also followed by a letter (A, B, or C), when the line was split into multiple segments. MB91-1_Tracklines.shp GIS polyline shapefile (.shp) for cruise MB91-1. USGS FID Internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape Shape type of feature Esri Polyline A line represented by an array of points Esri Shape_Leng Length of line segment in degrees Esri 0.001342 0.157396 Line Line number USGS 1 16 U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center USGS SPCMSC Data Management mailing and physical

600 4th Street South

Saint Petersburg FL 33701 United States 727-502-8000 gs-g-spcmsc_data_inquiries@usgs.gov ERDA90-2_Tracklines.shp, erda_90-2_nav.csv, ERDA90-2_#_PWS.pdf, EDRA90-2_#.png, ERDA90-2_#.seg, ERDA90-2_#.txt, MB91-1_Tracklines.shp, mb91-1_nav.csv, MB91-1_*_an.tif, MB91-1_#_PWS.png, MB91-1_#.seg, MB91-1_#.txt 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. SEG-Y The SEG-Y rev. 0 format (Barry and others, 1975) presented here consists of the following: a 3,600-byte reel identification header, with the first 3,200 bytes consisting of an American Standard Code for Information Interchange (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. Unzip using 7zip for PC users and BetterZip for Mac users. 3080 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/ERDA90-2_SEGY.zip None Portable Document Format, PNG Processed seismic profile images with axis scales and headers for cruise ERDA90-2 (.pdf). Unzip using 7zip for PC users and BetterZip for Mac users. 2550 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/ERDA90-2_ProfilesWithScales.zip None TIFF Printable seismic profiles with headers containing cruise, line, and scanning information for cruise ERDA90-2 (.tif). Unzip using 7zip for PC users and BetterZip for Mac users. 2470 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/ERDA90-2_ProfilesWithHeaders.zip None comma-delimited text ERDA90-2 cruise navigation data (.csv). Unzip using 7zip for PC users and BetterZip for Mac users. 0.024 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/ERDA90-2_Navigation.zip None shapefile Trackline shapefile of ERDA90-2 cruise (.shp). Unzip using 7zip for PC users and BetterZip for Mac users. 0.040 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/ERDA90-2_Tracklines.zip None SEG-Y The SEG-Y rev. 0 format (Barry and others, 1975) presented here consists of the following: a 3,600-byte reel identification header, with the first 3,200 bytes consisting of an American Standard Code for Information Interchange (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. Unzip using 7zip for PC users and BetterZip for Mac users. 745 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/MB91-1_SEGY.zip None Portable Document Formant, PNG Processed seismic profile images with axis scales and headers for cruise MB91-1 (.pdf). Unzip using 7zip for PC users and BetterZip for Mac users. 1050 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/MB91-1_ProfilesWithScales.zip None TIFF Printable seismic profiles with headers containing cruise, line, and scanning information for cruise MB91-1 (.tif). Unzip using 7zip for PC users and BetterZip for Mac users. 564 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/MB91-1_ProfilesWithHeaders.zip None comma-delimited text MB91-1 cruise navigation data (.csv). Unzip using 7zip for PC users and BetterZip for Mac users. 0.024 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/MB91-1_Navigation.zip None sahpefile Trackline shapefile of MB91-1 cruise (.shp). Unzip using 7zip for PC users and BetterZip for Mac users. 0.084 https://coastal.er.usgs.gov/data-release/doi-P1V6EDD5/data/ERDA90-2_Tracklines.zip None The geospatial files were created for use with Esri ArcGIS Pro 3.2.1 software. They may also be viewed with QGIS (https://www.qgis.org/en/site/, 2024), Google Earth (https://earth.google.com/, 2024), or other GIS software capable of importing the data. Use of SEG-Y data requires specialized seismic processing software, such as public domain software Seismic Unix (https://github.com/JohnWStockwellJr/SeisUnix). 20260610 U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center USGS SPCMSC Data Management mailing and physical

600 4th Street South

Saint Petersburg FL 33701 United States 727-502-8000 gs-g-spcmsc_data_inquiries@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998