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FGDC Metadata

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Arnell S. Forde

Originator: James G. Flocks

Originator: Jack L. Kindinger

Originator: Julie C. Bernier

Originator: Kyle W. Kelso

Originator: Dana S. Wiese

Publication_Date: 2015

Title:

Archive of Digital Chirp Subbottom Profile Data Collected During USGS Cruise 13CCT04 Offshore of Petit Bois Island, Mississippi, August 2013

Geospatial_Data_Presentation_Form: Tabular, vector, and raster digital data

Series_Information:

Series_Name: U.S. Geological Survey Data Series

Issue_Identification: 924

Publication_Information:

Publication_Place: St. Petersburg, FL

Publisher: U.S. Geological Survey

Online_Linkage: <https://pubs.usgs.gov/ds/0924/>

Description:

Abstract:

In August of 2013, the U.S. Geological Survey conducted a geophysical survey offshore of Petit Bois Island, Mississippi to investigate the geologic controls on barrier island framework and long-term sediment transport. This report serves as an archive of unprocessed digital chirp subbottom data, trackline maps, navigation files, GIS information, and formal FGDC metadata. Gained digital images of the seismic profiles are provided. The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG Y revision 0 format (Barry and others, 1975) and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU). Example SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992) are also provided. These data are available for viewing using GeoMapApp (<http://www.geomapapp.org/>) and Virtual Ocean (<http://www.virtualocean.org/>) multi-platform open source software. In addition, the SEG Y files can also be downloaded from the USGS Coastal and Marine Geoscience Data System (<http://cmgds.marine.usgs.gov>).

Purpose:

To archive all digital chirp subbottom profile data and associated files collected during cruise 13CCT04.

Supplemental_Information:

The USGS Saint Petersburg Coastal and Marine Science Center (SPCMSC) - St. Petersburg, Fla., assigns a unique identifier to each cruise or field activity. For example, 13CCT04 indicates the data were collected in 2013 for the Coastal Change and Transport (CCT) study, during the fourth field activity for that project in that calendar year. Refer to <http://walrus.wr.usgs.gov/infobank/programs/html/definition/activity.html> for a detailed description of the method used to assign the cruise ID. The naming convention used for each subbottom line is as follows: yye##a, where 'yy' are the last two digits of the year in which the data were collected, 'e' is a 1-letter abbreviation for the equipment type (for example, c for 424 chirp; i for 512i chirp), '##' is a 2-digit number representing a specific track, and 'a' is a letter representing a section of the line if recording was prematurely terminated or rerun for quality or acquisition problems.
All Chirp systems use a signal of continuously varying frequency; the systems used during this survey produce high-resolution, shallow-penetration (typically less than 50-ms) profile images of sub-seafloor stratrigraphy. The towfish contains a transducer that transmits and receives acoustic energy and is typically towed 1–2 meters (m) below the sea surface. As transmitted acoustic energy intersects density boundaries, such as the seafloor or sub-surface sediment layers, some energy is reflected back 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 (2-D) vertical image of the shallow geologic structure beneath the towfish is produced.
The seismic source utilized during 13CCT04 consisted of an EdgeTech SB-424 and 512i towfish running Discover v. 3.51 acquisition software and towed about 4 m and 28 m, respectively, behind the Global Positioning System (GPS) antenna. The data were acquired using a frequency sweep of 4–20 kilohertz (kHz), a 43 kHz sample frequency, and approximately 65 ms record length. Based on survey speeds of 3.5 knots, the shot spacing was about 0.450 m.
The binary portion of the unprocessed seismic data is stored in SEG Y rev. 0 (Barry and others, 1975), IBM float 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 in American Standard Code for Information Interchange (ASCII) format instead of Extended Binary Coded Decimal Interchange Code (EBCDIC) format. The SEG Y formatted trace files have a .sgy extension. The SEG Y files may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU) (Cohen and Stockwell, 2010). Also provided are example SU scripts that allow the user to remove navigation fixes from the SEG Y headers, along with a fix for every 1,000 shots, and produce a printable, gained Graphics Interface Format (GIF) image of each profile. The printable profiles provided are GIF images that were gained using SU software. Refer to the Software page of this report for links to example SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992).

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20130813

Ending_Date: 20130823

Currentness_Reference: Data collection interval

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -88.541853

East_Bounding_Coordinate: -88.320964

North_Bounding_Coordinate: 30.192481

South_Bounding_Coordinate: 30.077500

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: geoscientificinformation

Theme_Keyword: oceans

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Geology

Theme_Keyword: Coastal information

Theme_Keyword: Marine

Theme_Keyword: Subbottom profile

Theme_Keyword: Seismic reflection

Theme_Keyword: Chirp

Theme_Keyword: Society of Exploration Geophysicists

Theme_Keyword: SEG Y

Theme_Keyword: Coastal Change and Transport

Theme_Keyword: 13CCT04

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Content

Place_Keyword: United States of America

Place_Keyword: Mississippi

Place_Keyword: Petit Bois Island

Place_Keyword: Gulf of Mexico

Access_Constraints: None. These data are held in the public domain.

Use_Constraints:

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

Browse_Graphic:

Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0924/maps/13cct04_location.jpg>

Browse_Graphic_File_Description:

Figure 2. Location map of all digital chirp subbottom data collected during USGS Field Activity 13CCT04. This map was created at a scale of 1:125,000.

Browse_Graphic_File_Type: JPEG

Data_Set_Credit:

Funding and (or) support for this study was provided by the USGS Coastal and Marine Geology Program, Mississippi Coastal Improvements Program (MsCIP), and the Northern Gulf of Mexico Ecosystem Change and Hazard Susceptibility Project. We thank Research Vessel (R/V) Tommy Munro captain Paul Beaugez and crew (University of Southern Mississippi/Gulf coast Research Laboratory - Biloxi, MS) for their assistance in data collection and Will Pfeiffer and Nancy DeWitt for their assistance with bathymetry data processing. This document was improved by the reviews of Marci Marot and Samantha Kuzma of the USGS - St. Petersburg, Fla. and Cherokee Nation Technology Solutions, respectively. Disc Image Credit: Descloitres, J., MODIS Land Rapid Response Team at the National Aeronautics and Space Administration Goddard Space Flight Center, 2001, Mississippi.A2001361.1640.250m.jpg. Available on-line at http://visibleearth.nasa.gov/view_rec.php?id=2364.

Cross_Reference:

Citation_Information:

Originator: Cohen, J.K., and Stockwell, J.W., Jr., CWP/SU

Publication_Date: 2010

Title:

Seismic Unix Release 41: A free package for seismic research and processing, Center for Wave Phenomena, Colorado School of Mines

Online_Linkage: <http://www.cwp.mines.edu/cwpcodes/>

Cross_Reference:

Citation_Information:

Originator: Zihlman, F.N., USGS

Publication_Date: 1992

Title:

DUMPSEGY V1.0: A program to examine the contents of SEG Y disk-image seismic data

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report

Issue_Identification: 92–590

Other_Citation_Details: 28 pages

Online_Linkage: <http://pubs.er.usgs.gov/usgspubs/ofr/ofr92590>

Cross_Reference:

Citation_Information:

Originator: Barry, K.M., Cavers, D.A., and 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: <http://www.seg.org/publications/tech-stand/>

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The validity or accuracy of marine subbottom 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.

Logical_Consistency_Report:

This dataset is from one field activity with consistent instrument calibrations.

Completeness_Report:

These data are collected along tracklines (2-D) and are therefore inherently incomplete. Due to system malfunctions, subbottom data using both the 512i and 424 systems.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

As the subbottom data were acquired, the position of the vessel was continuously determined by a CodaOctopus F190 DGPS [Digital Global Positioning System] and subsequently sent to Hypack 2010 navigation software to ensure a consistent grid spacing during data collection. Positions were recorded and written to trace headers in latitude and longitude coordinates about every 1 s using navigation from the CodaOctopus F190 receiver with OmniSTAR High Performance (HP) correction (accurate to within 20 cm). The approximately 4-m (424 chirp) and 28-m (512i chirp) offset between the chirp shot and ship's GPS was not accounted for during acquisition nor have the ASCII navigation files and trackline maps 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 (TWT) times shown on the printable profile images are relative to the chirp towfish position, not to the sea surface.

Lineage:

Process_Step:

Process_Description:

Chirp processing: The SEG Y data were processed with Seismic Unix to produce gained GIF images of the subbottom profiles included in this report. A representative chirp data processing sequence consisted of (1) stripping off navigation data for each shot and converting to SU format, (2) applying automatic gain control, (3) generating a PostScript image of the traces, and (4) converting the PostScript image to a GIF image. For additional SU processing and script details, please refer to <https://pubs.usgs.gov/ds/0924/software/su/readme.txt>.

Source_Used_Citation_Abbreviation: SEG Y

Process_Date: 2013

Source_Produced_Citation_Abbreviation: printable/SEG Y.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

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 processing: Shotpoint navigation, start of line, and 1,000-shot-interval location files were extracted using Seismic Unix software and output as ASCII text files; they were then processed with PROJ.4.7.0 (<http://trac.osgeo.org/proj/>) to generate Universal Transverse Mercator (UTM) coordinates (WGS84, Zone 16, meters) from latitude and longitude coordinates. Text files for each seismic line were concatenated into comma-delimited text files (for use with ESRI (Environmental Systems Research Institute) software); one containing unique shotpoint positions (13cct04.txt), another containing the 1,000-shot-interval locations (s13cct04.txt), and the last containing start of line locations (13cct04_s); which can be viewed within the nav folder.

Source_Used_Citation_Abbreviation: 13c**.txt, 13i**.txt

Process_Date: 2013

Source_Produced_Citation_Abbreviation: 13cct04.txt

Source_Produced_Citation_Abbreviation: s13cct04.txt

Source_Produced_Citation_Abbreviation: 13cct04_s.txt

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

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:

All concatenated, comma-delimited text files were imported into ArcGIS and saved as either a point or polyline file in the ESRI shapefile format. Trackline map creation: The trackline maps were created using ESRI ArcGIS 10.1 software. The processed navigation file, 13cct04.txt, was imported into ArcMap 10.1 and processed using the ArcScript, Points to Lines, to create a line shapefile of the cruise tracklines (13cct04_trkln). The 1,000-shot-interval file, s13cct04.txt, and the start of line file, 13cct04_s.txt, were imported into ArcMap as point shapefiles 13cct04_shots and 13cct04_sol. Please refer to the shapefile metadata included in the ArcGIS map document in the Software section of this archive for additional details. All maps were exported to Adobe Illustrator v. 14 for further editing converted into JPEG format by Adobe Dreamweaver v. 10 Build 4117. The maps are unprojected (geographic coordinates, WGS84). The USGS is the originators of all layers used. Please see the ArcGIS readme file for detailed information about the GIS files used in this report.

Source_Used_Citation_Abbreviation: 13cct04.txt

Source_Used_Citation_Abbreviation: s13cct04.txt

Source_Used_Citation_Abbreviation: 13cct04_s.txt

Process_Date: 2013

Source_Produced_Citation_Abbreviation: 13cct04_trkln.shp

Source_Produced_Citation_Abbreviation: 13cct04_shots.shp

Source_Produced_Citation_Abbreviation: 13cct04_sol.shp

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

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:

Data Series preparation: In addition to the process steps described above, the following steps were taken to produce this Data Series report: the handwritten cruise logs were scanned and saved as a PDF file, digital logs were created by J. Bernier using the cruise logs and the personal accounts of crew members and saved as PDF files, and an HTML-based format was used to present the various parts of this archive.

Process_Date: 2013

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

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:

Indirect_Spatial_Reference:

Horizontal X and Y locations (latitude and longitude and Zone 16 UTM coordinates) for each shot are provided as ASCII text files, along with the date and time time (Universal Coordinated Time (UTC)) the shot was recorded.

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0197881408

Longitude_Resolution: 0.0227546261

Geographic_Coordinate_Units: Decimal Degrees

Geodetic_Model:

Horizontal_Datum_Name: WGS84

Ellipsoid_Name: WGS_1984

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: 13cct04.txt, s13cct04.txt, and 13cct04_s.txt

Entity_Type_Definition: Shotpoint navigation files

Entity_Type_Definition_Source: SEG Y headers (<http://www.seg.org/publications/tech-stand>).

Attribute:

Attribute_Label: FID*

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape*

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: UTMX

Attribute_Definition: UTM-X coordinate (Zone 16)

Attribute_Definition_Source: Universal Transverse Mercator Geographic Coordinate System

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 369084

Range_Domain_Maximum: 370236

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: UTMY

Attribute_Definition: UTM-Y coordinate (Zone 16)

Attribute_Definition_Source: Universal Transverse Mercator Geographic Coordinate System

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 3335225

Range_Domain_Maximum: 3335365

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Line

Attribute_Definition: Trackline number

Attribute_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Unrepresentable_Domain:

The naming convention used for each subbottom line is as follows: yye##a, where 'yy' are the last two digits of the year in which the data were collected, 'e' is a 1-letter abbreviation for the equipment type (for example, c for 424 chirp; i for 512i chirp), '##' is a 2-digit number representing a specific track, and 'a' is a letter representing a section of the line if recording was prematurely terminated or rerun for quality or acquisition problems.

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: 19000

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: -88.359261

Range_Domain_Maximum: -88.347286

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: 30.141444

Range_Domain_Maximum: 30.142586

Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: YEAR

Attribute_Definition: Year

Attribute_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2013

Range_Domain_Maximum: 2013

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

Overview_Description:

Entity_and_Attribute_Overview:

Binary data file: Trace data are available as binary files in SEG Y format. These files have a .sgy extension and range in size from 4 to 217 MB. These data can be found by going to <http://cmgds.marine.usgs.gov>.

Entity_and_Attribute_Overview:

Graphic image file: Printable versions of the subbottom profiles are available as GIF images; links to these images can be found on the Profiles page of this report or by going to <https://pubs.usgs.gov/ds/0924/profiles/printable/>.

Entity_and_Attribute_Overview:

Navigation file: Navigation files are available as ASCII text files. Provided are raw (unprocessed) shotpoint navigation files (13c**.txt and 13i**.txt), processed shotpoint navigation (13cct04.txt), processed 1,000-shot-interval location (s13cct04.txt), and a start of line file (13cct04_s.txt). Fields/Attributes [FID, Shape] marked above with an asterisk (*) were created by ESRI ArcGIS and are used exclusively by the shapefiles created from the three aforementioned .txt files; these fields are not included in the original navigation files. All remaining attributes listed above, in the Entity_and_Attribute_Information section, that do not have an accompanying asterisk are found in 13cct04.txt, s13cct04.txt, and 13cct04_s.txt. Raw and processed navigation data files can be found by going to <https://pubs.usgs.gov/ds/0924/nav/>.

Entity_and_Attribute_Overview:

GIS file: The GIS project used to create the trackline maps is provided as a .zip file composed of ESRI map documents, shapefiles, and metadata.

Entity_and_Attribute_Detail_Citation: Information is derived from SEG Y headers.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Arnell 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:

All of this report is available online. The SEG Y files are downloadable from the Coastal and Marine Geoscience Data System (<http://cmgds.marine.usgs.gov>).

Resource_Description: U.S. Geological Survey Data Series 924

Distribution_Liability:

This DVD publication was prepared by an agency of the United States Government. Although these data have been 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 rev. 0

Format_Information_Content:

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 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: 8.96 GB

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: map document, shapefile, metadata

Format_Information_Content:

The GIS project used to create the trackline maps is composed of map documents, shapefiles, and metadata. Map documents were created with ESRI ArcGIS 10.1 software. The shapefiles provided may also be viewed using other versions of ESRI desktop software including their free software or ArcGIS Explorer (<http://www.esri.com/software/arcgis/explorer/>).

File_Decompression_Technique: unzip

Transfer_Size: 138 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <https://pubs.usgs.gov/ds/0924/software/arc/arc.zip>

Fees: None, if obtained online; otherwise, prices vary.

Ordering_Instructions:

Publications are available from USGS Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, e-mail: infoservices@usgs.gov).

Technical_Prerequisites:

Use of SEG Y data requires specialized seismic processing software, such as public domain software Seismic Unix (<http://www.cwp.mines.edu/cwpcodes/>).

Metadata_Reference_Information:

Metadata_Date: 20150226

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Arnell 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