FGDC Formal Seismic Metadata - Archive of Digital Boomer Seismic Reflection Data Collected During USGS Cruises 94CCT01 and 95CCT01, Eastern Texas and Western Louisiana, 1994 and 1995

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
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Identification_Information: Citation: Citation_Information: Originator: Karynna Calderon Originator: Shawn V. Dadisman Originator: Jack L. Kindinger Originator: James G. Flocks Originator: Robert A. Morton Originator: Dana S. Wiese Publication_Date: 2004 Title: Archive of Digital Boomer Seismic Reflection Data Collected During USGS Cruises 94CCT01 and 95CCT01, Eastern Texas and Western Louisiana, 1994 and 1995 Geospatial_Data_Presentation_Form: Seismic Reflection Profile Section Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 93 Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Description: Abstract: In June of 1994 and August and September of 1995, the U.S. Geological Survey, in cooperation with the University of Texas Bureau of Economic Geology, conducted geophysical surveys of the Sabine and Calcasieu Lake areas and the Gulf of Mexico offshore eastern Texas and western Louisiana. This report serves as an archive of unprocessed digital boomer seismic reflection data, trackline maps, navigation files, observers' logbooks, GIS information, and formal FGDC metadata. In addition, a filtered and gained GIF image of each seismic profile is provided. The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG-Y format (Barry and others, 1975) and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU). Examples of SU processing scripts and in-house (USGS) software for viewing SEG-Y files (Zihlman, 1992) are also provided. Processed profile images, trackline maps, navigation files, and formal metadata may be viewed with a web browser. Scanned handwritten logbooks and Field Activity Collection System (FACS) logs may be viewed with Adobe Reader. Purpose: The data archived here were collected as part of the USGS Coastal Change and Transport (CCT) Project. For further information about this study, refer to Morton and others (1999). Supplemental_Information: The USGS Florida Integrated Science Center (FISC) - Coastal and Watershed Studies in St. Petersburg, Florida, assigns a unique identifier to each cruise or field activity. The method used to assign the identifier for the activity is as follows: YYPPP##, where YY stands for the last 2 digits of the year in which the fieldwork is conducted, PPP is a 3-letter abbreviation for the project the data are collected for, and ## is a 2-digit event tag that represents a discreet leg or time period of fieldwork. For example, 94CCT01 indicates the data were collected in 1994 for the Coastal Change and Transport (CCT) Project and the data were collected during the first field activity for that project in that calendar year. The boomer is an acoustic energy source that consists of capacitors charged to a high voltage and then discharged through a transducer in the water. The transducer is towed on a sled at the sea surface and when discharged emits a short acoustic pulse, or shot, that propagates through the water and sediment column. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor), detected by the receiver, and recorded by a PC-based seismic acquisition system. This process is repeated at timed intervals (e.g., 0.25 s) and recorded for specific intervals of time (e.g., 100 ms). In this way, a two-dimensional vertical image of the shallow geologic structure beneath the ship track is produced. Huntec power supplies provided 60-135 joules (J) per shot for 94CCT01 and 35-100 J per shot for 95CCT01. Reflected energy was received by an ITI ST-5 streamer and recorded by Triton Elics Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced over a length of 6 m, all of which were used for 95CCT01. It is unknown which hydrophones were used for 94CCT01. For parts of 94CCT01 and all of 95CCT01 the streamer was positioned parallel to the boomer sled and laterally separated from it by about 7 m. Changes in 94CCT01 acquisition geometry occurred several times and are recorded in the operations logbook included with this archive (Data Series 93). The sample frequency of the data was 10 kHz for 94CCT01 and 12 kHz for 95CCT01. Trace length for all tracklines was 100 ms. Based on survey speeds of 3.5 - 4 knots and a shot rate of every 0.25 s, shot spacing was about 0.5 m. The original trace files for 94CCT01 lines SL627_1, SL628_6, SL629_13, and SL630_15 and 95CCT01 lines TEXSB_3 - TEXSB_11 were divided into two or more trace files (e.g., SL627_1 became SL627_1a and SL627_1b) because the original total number of traces exceeded the maximum allowed by the processing system. Only the first 7,500 of 44,873 shots were recoverable from the original digital file for 94CCT01 line SL629_12. The unprocessed seismic data were stored in SEG-Y format, which is a standard digital format that can be read and manipulated by most seismic processing software packages (Barry and others, 1975). The SEG-Y file format includes a 3,200-byte descriptive header that contains detailed information regarding the data acquisition and processing parameters. All data presented here are stored in SEG-Y, integer, Motorola format. The SEG-Y formatted trace files have a .TRA extension. Additional recording parameters for each trace file can also be found in the .PAR file associated with each .TRA file. However, the .PAR and .PLN files included here are only needed to process or display the data with Triton Elics Delph Seismic software. The original trace files were recorded in nonstandard ELICS format and later converted to SEG-Y format using Triton Elics software. Also included on these discs are example Seismic Unix scripts that allow the user to strip off navigation fixes from the SEG-Y headers, along with a fix for every 500 shots, and produce a filtered and gained GIF image of each profile. These images can then be displayed using a variety of shareware programs such as ImageMagick (Unix, Linux) or a web browser. For both cruises, GPS navigation was provided to the acquisition system by a Trimble Nav Graphics GPS receiver, whose accuracy is within 15 m. This was done about every 60 s for 95CCT01. The fix interval for 94CCT01 varied between 10 and 60 s. The data required some editing to remove or correct spurious data points and fix incorrectly recorded dates. The edited results were used to generate the trackline maps presented here. The navigation data have not been corrected to reflect any offset between the shotpoint and GPS antenna. This offset was 20 m for 95CCT01 and is unknown for 94CCT01. Position fixes for every 500 shots and for the start of lines are also provided as an aid for registering of the data after plotting. All navigation files are stored as ASCII text files. Navigation data are not available for the start of several 94CCT01 and 95CCT01 lines. No navigation was recorded for 95CCT01 line TEXSB_1. The trackline maps provided in this archive are set in geographic coordinates, NAD83 (unprojected). They were created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. These JPEG images are viewable with a web browser. Also included are ArcView map documents and shapefiles used to create the trackline maps presented here. The map documents, created with ArcView 8.1, are compatible with ArcGIS 8.1 (Windows). The shapefiles, created with ArcView 3.2, may be viewed with other versions of ArcView or public domain software ArcExplorer 2.0 (Windows) and 4.0 (Windows, Mac OS X, Unix, Linux), available from the ESRI website at <http://www.esri.com/software/arcexplorer/>. FACS logs and scanned versions of the handwritten logbooks are provided as PDF files. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19940627 Ending_Date: 19950906 Currentness_Reference: Data collection interval Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -94.013017 East_Bounding_Coordinate: -92.918667 North_Bounding_Coordinate: 30.027203 South_Bounding_Coordinate: 29.440250 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: marine seismic reflection Theme_Keyword: boomer Theme_Keyword: SEG-Y Theme_Keyword: 94CCT01 Theme_Keyword: 95CCT01 Theme_Keyword: Coastal Change and Transport Project Place: Place_Keyword_Thesaurus: None Place_Keyword: Sabine Lake Place_Keyword: Sabine Pass Place_Keyword: Neches River Place_Keyword: Black Bayou Place_Keyword: Calcasieu Lake Place_Keyword: Gulf of Mexico Place_Keyword: Texas Place_Keyword: Louisiana Access_Constraints: None. These data are held in the public domain. Use_Constraints: The U.S. Geological Survey requests to be acknowledged as the originator of the data in future products or derivative research. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jack L. Kindinger Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer 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) 803-8747, ext. 3018 Contact_Electronic_Mail_Address: jkindinger@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/all.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected during USGS Cruises 94CCT01 and 95CCT01. These data were collected in Sabine Lake, Sabine Pass, the Neches River, Black Bayou, Calcasieu Lake, and the Gulf of Mexico offshore eastern Texas and western Louisiana in June of 1994 and August and September of 1995. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:600,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The coastline layer was derived from 1:100,000 DLGs. The USGS is not the originator of all layers used in creating this map. The U.S. states layer is an Environmental Systems Research Institute (ESRI) dataset. The Texas hydrography layer is a Texas General Land Office (GLO)/Texas Department of Transportation (DOT) dataset. The Louisiana waterbodies layer is a Louisiana Oil Spill Coordinator's Office (LOSCO) dataset derived from ESRI/Geographic Data Technology, Inc. (GDT) data. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_a.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area A (refer to Area A of the full survey area map) during USGS Cruise 94CCT01. These data were collected in Sabine Lake of eastern Texas and western Louisiana in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The coastline layer was derived from 1:100,000 DLGs. The USGS is not the originator of all layers used in creating this map. The Texas hydrography layer is a Texas GLO/Texas DOT data set. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_b.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area B (refer to Area B of the full survey area map) during USGS Cruise 94CCT01. These data were collected in Sabine Lake, the Neches River, and Black Bayou of eastern Texas and western Louisiana in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The Texas hydrography layer is a Texas GLO/Texas DOT data set. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_c.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area C (refer to Area C of the full survey area map) during USGS Cruises 94CCT01 and 95CCT01. These data were collected in the Gulf of Mexico offshore eastern Texas and western Louisiana in June of 1994 and August and September of 1995. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The coastline layer was derived from 1:100,000 DLGs. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_d.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area D (refer to Area D of the full survey area map) during USGS Cruise 95CCT01. These data were collected in the Gulf of Mexico offshore western Louisiana in September of 1995. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The coastline layer was derived from 1:100,000 DLGs. The USGS is not the originator of all layers used in creating this map. The Louisiana waterbodies layer is a LOSCO dataset derived from ESRI/GDT data. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_e.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area E (refer to Area E of the full survey area map) during USGS Cruise 95CCT01. These data were collected in the Gulf of Mexico offshore eastern Texas and western Louisiana in September of 1995. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_f.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area F (refer to Area F of the full survey area map) during USGS Cruise 95CCT01. These data were collected in the Gulf of Mexico offshore eastern Texas and western Louisiana in September of 1995. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_g.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area G (refer to Area G of the full survey area map) during USGS Cruise 95CCT01. These data were collected in Calcasieu Lake, Louisiana, in September of 1995. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The coastline layer was derived from 1:100,000 DLGs. The USGS is not the originator of all layers used in creating this map. The Louisiana waterbodies layer is a LOSCO dataset derived from ESRI/GDT data. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_h.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area H (refer to Area H of the full survey area map) during USGS Cruise 95CCT01. These data were collected in the Gulf of Mexico offshore western Louisiana in September of 1995. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The coastline layer was derived from 1:100,000 DLGs. The USGS is not the originator of all layers used in creating this map. The Louisiana waterbodies layer is a LOSCO dataset derived from ESRI/GDT data. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: DVD/maps/area_i.jpg Browse_Graphic_File_Description: Trackline map of boomer seismic reflection data collected in Area I (refer to Area I of the full survey area map) during USGS Cruise 95CCT01. These data were collected in the Gulf of Mexico offshore western Louisiana in September of 1995. This map is set in geographic coordinates, NAD83 (unprojected), and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The coastline layer was derived from 1:100,000 DLGs. The USGS is not the originator of all layers used in creating this map. The Louisiana waterbodies layer is a LOSCO dataset derived from ESRI/GDT data. Browse_Graphic_File_Type: JPEG Data_Set_Credit: Funding and/or support for this study were provided by the USGS Coastal and Marine Geology Program and the University of Texas Bureau of Economic Geology. At the time of data collection, author R. Morton was with the UT Bureau of Economic Geology. We thank R/V G.K. Gilbert Captains Keith A. Ludwig of the USGS in St. Petersburg, Florida, and J. Green of the NOAA Corps in Washington, DC, for their assistance in data collection. This document was improved by the reviews of Virginia H. Garrison and John T. Lisle of the USGS in St. Petersburg, Florida. Native_Data_Set_Environment: SEG-Y

Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The validity or accuracy of marine seismic reflection profiles 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. The original trace files for 94CCT01 lines SL627_1, SL628_6, SL629_13, and SL630_15 and 95CCT01 lines TEXSB_3 - TEXSB_11 were divided into two or more trace files (e.g., SL627_1 became SL627_1a and SL627_1b) because the original total number of traces exceeded the maximum allowed by the processing system. Only the first 7,500 of 44,873 shots were recoverable from the original digital file for 94CCT01 line SL629_12. Logical_Consistency_Report: These data sets are from two different field activities. Differences occur in navigation, acquisition equipment, and acquisition geometry between vessels and field activities. Horizontal accuracy varies with navigation equipment used, and signal-to-noise ratio of the data changes with hydrophone streamers used. However, for most purposes, the profile data are comparable for all systems used. Refer to the Supplemental Information section for details of equipment and geometry used for each seismic line. Completeness_Report: These data are collected along tracklines (2D) and are therefore inherently incomplete. Geologic details between lines must be inferred. Record length for both cruises is 100 ms. Only the first 7,500 of 44,873 shots were recoverable from the original digital file for 94CCT01 line SL629_12. Navigation data are not available for the start of several 94CCT01 and 95CCT01 lines. No navigation was recorded for 95CCT01 line TEXSB_1. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Positional accuracy was determined with a Trimble Nav Graphics GPS receiver, whose accuracy is within 15 m. The GPS string was fed to the Delph Seismic acquisition system about every 60 s for 95CCT01 and varying between every 10 and 60 s for 94CCT01. Navigation fixes were recorded in latitude and longitude in the trace headers. The navigation data have not been corrected to reflect the offset between the shotpoint and GPS antenna. This offset was 20 m for 95CCT01 and varied for 94CCT01. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Boomer data are relative to sea level. However, varying recorded static shifts of the data have been known to occur. Therefore, these data are not to be used for bathymetry. Lineage: Process_Step: Process_Description: Boomer processing: Triton Elics software was used to convert the original trace files from nonstandard ELICS format to standard SEG-Y format. During the format conversion process, the original trace files for those lines which exceeded 32,767 shots were divided into two or more trace files (e.g., SL627_1 became SL627_1a and SL627_1b). The SEG-Y data were then processed with Seismic Unix (SU) to produce the GIF seismic profile images included in this report. A representative SU processing sequence consisted of: 1) Bandpass filter: 300-500-2500-3000 Hz, 2) Automatic gain control, 3) Postscript display, and 4) Conversion of Postscript image to a GIF image. Process_Date: 2003 Process_Step: Process_Description: Positional (navigation) data: As the seismic reflection data were acquired, the position of the vessel was continuously determined by a GPS receiver. Positions were recorded and written to the trace headers about every 60 s for 95CCT01 and varying between every 10 and 60 s for 94CCT01. Some editing to the original navigation for several lines was required before being reinjected into the headers using Triton Elics software. Unique navigation fixes were extracted from the headers during the format conversion process, and 500-shot interval navigation files were later extracted from the SEG-Y headers using Seismic Unix scripts. Process_Date: 2003 Process_Step: Process_Description: Editing navigation: ASCII navigation files were extracted from the trace headers and edited to remove or correct spurious data points and fix incorrectly recorded dates. The data were then processed using PROJ.4 (http://www.remotesensing.org/proj) to generate Zone 15 UTMs from latitude and longitude and reformat the data for use with ESRI's ArcView GIS software. Both sets of coordinates are provided for all lines. Process_Date: 2003 Process_Step: Process_Description: Data Series preparation: The original trace files were recorded in nonstandard ELICS format and later converted to standard SEG-Y format using Triton Elics software. No processing has been done to the SEG-Y data files provided on these discs, with the exception of dividing the original trace files for 94CCT01 lines SL627_1, SL628_6, SL629_13, and SL630_15 and 95CCT01 lines TEXSB_3 - TEXSB_11 into two or more trace files (e.g., SL627_1 became SL627_1a and SL627_1b) because the original total number of traces exceeded the maximum allowed by the processing system. The data were displayed as 8-bit grayscale Postscript files using the Seismic Unix 'psimage' algorithm. The Postscript images were then converted to GIF images. Process_Date: 2003

Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Horizontal X and Y locations (both latitude and longitude and Zone 15 UTMs) for each shot are provided in ASCII position files, along with the date and time (Greenwich Mean Time) the shot was recorded.

Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0000027 Longitude_Resolution: 0.0000027 Geographic_Coordinate_Units: decimal degrees Geodetic_Model: Horizontal_Datum_Name: WGS84 Ellipsoid_Name: WGS84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Binary data file: Trace data are available as a binary file in Society of Exploration Geophysicists (SEG) SEG-Y format. The SEG-Y file is useful only if you have access to specialized software designed to process and display seismic reflection data. These SEG-Y files have a .TRA extension and range in size from 3.3 to 84.5 MB. Entity_and_Attribute_Detail_Citation: Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards for digital tape formats: Geophysics, v. 40, n.2, p. 344-352. Also available online at: <http://www.seg.org/publications/tech-stand>. Entity_and_Attribute_Detail_Citation: Morton, R.A., Kindinger, J.L., Flocks, J.G., and Stewart, L.B., 1999, Climatic and eustatic control of Holocene nearshore parasequence development, southeastern Texas coast: Transactions Gulf Coast Association of Geological Societies, v. 49, p. 384-395. Entity_and_Attribute_Detail_Citation: Zihlman, F.N., 1992, DUMPSEGY V1.0: A program to examine the contents of SEG-Y disk-image seismic data: U.S. Geological Survey Open-File Report 92-590, 28 p. Entity_and_Attribute_Overview: Graphic image file: Each profile is available as a GIF image. These profiles range in size from 210 KB to 4.2 MB. The trackline maps are JPEG images that contain hotlinks to the seismic profile GIF images. The maps range in size from 39 to 108 KB. Entity_and_Attribute_Overview: Navigation files: Navigation files are available as ASCII text files. Raw navigation files range in size from 1 to 34 KB. Edited navigation files range in size from 156 to 221 KB. Edited 500-shot interval navigation files range in size from 48 to 77 KB. Entity_and_Attribute_Overview: GIS files: The GIS project used to create the trackline maps in this archive is provided as a zip file composed of map documents, shapefiles, and metadata. The map documents range in size from 244 to 546 KB. The shapefiles range in size from 2.68 KB to 29 MB.

Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Shawn V. Dadisman 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) 803-8747, ext. 3029 Contact_Electronic_Mail_Address: sdadisman@usgs.gov Contact_Instructions: Data may be available on-line only by special arrangement with the distributor above. Resource_Description: U.S. Geological Survey Data Series 93 Distribution_Liability: This DVD publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report or represents that its use would not infringe privately owned rights. Reference therein 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. Although all data and software published on this DVD have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: SEG-Y Format_Information_Content: The SEG-Y standard format (Barry et al., 1975) 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. File_Decompression_Technique: None Transfer_Size: 2,220 MB Digital_Transfer_Option: Offline_Option: Offline_Media: DVD Recording_Format: ISO 9660 Compatibility_Information: UNIX, LINUX, DOS, Macintosh Digital_Form: Digital_Transfer_Information: Format_Name: ESRI map documents, shapefiles, metadata Format_Information_Content: GIS project used to create the trackline maps presented in this archive and associated metadata File_Decompression_Technique: unzip Transfer_Size: 29.8 MB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: DVD/software/arc/arc.zip Fees: Prices vary. Ordering_Instructions: Publications are available from USGS Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, email: infoservices@usgs.gov). Technical_Prerequisites: Use of SEG-Y data requires specialized seismic processing software, such as Unix or Linux-based public domain software Seismic Unix developed by the Colorado School of Mines Center for Wave Phenomena and downloadable at <http://www.cwp.mines.edu/cwpcodes/>.

Metadata_Reference_Information: Metadata_Date: 20040701 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Karynna Calderon Contact_Organization: ETI Professionals, Inc. Contact_Position: Geographer, Data Management Group Contact_Address: Address_Type: mailing and physical Address: U.S. Geological Survey, 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 803-8747, ext. 3143 Contact_Electronic_Mail_Address: kcalderon@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998