Metadata: Identification_Information: Citation: Citation_Information: Originator: Nealon, Jeffrey Publication_Date: 1999 Title: Seismic Reflection Results from the Gyre 1997 Cruise at the Bryant Canyon of the Louisiana Gulf Coast Series_Information: Series_Name: Open-File Report Issue_Identification: 99-449 Publication_Information: Publication_Place: Woods Hole, MA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/ofr99449 Larger_Work_Citation: Citation_Information: Originator: Jeffrey W. Nealon Originator: William P. Dillon Originator: David Twichell Publication_Date: 2000 Title: Seismic reflection results from the GYRE 1997 cruise of the Bryant Canyon on the Louisiana Gulf Coast Edition: 1 Series_Information: Series_Name: Open-File Report Issue_Identification: 99-449 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/ofr99449 Description: Abstract: This CD-ROM contains digital high resolution seismic-reflection data collected during the USGS GYRE 97006 cruise. The coverage is the offshore Louisana continental slope, Gulf of Mexico. The seismic-reflection data are stored as IBM 4 bit interger SEG-Y format that can be read and manipulated by most seismic-processing software. Much of the information specific to the data are contained in the headers of the SEG-Y format files. The file system format is ISO 9660 which can be read with DOS, Unix, and MAC operating systems with the appropriate CD-ROM driver software installed. This directory contains the processed (using Promax 7.2) and unprossesd (RAW) GI air gun data collected on the GYRE 97006 cruise. These data were collected using a Seismic Systems Inc. generated injected (GI) air gun source. On this cruise the GI gun was configured with two 105 cu. in. chambers, a total of 210 cu. in. The GI gun works by using one chamber for a primary pulse and the second chamber injects a pulse near the maximum expansion of the primary pulse. This results in a dampening effect on the collapse of the primary bubble pulse. The data were logged on an Intel based PC computer (Mudseis system). The data are two-channel (two traces per shot). Purpose: The seismic-reflection data are being archived so that further digital processing can be done for the seafloor mapping project: TECTONICS AND SEDIMENTARY PROCESSES OF THE SALT DEFORMED TEXAS-LOUISIANA CONTINENTAL SLOPE. This project proposes (1) mapping the surficial geology of a large part of the TX-LA slope using advanced processing techniques and existing GLORIA and multibeam data, (2) conducting a higher resolution sidescan and sampling cruise to refine the understanding of tectonic, sediment supply, and oceanographic controls on sedimentary processes, (3) linking the surficial geology with the subsurface structures and stratigraphy for modern and ancient comparison of sedimentary systems, and (4) integrating data into a three-dimensional model of depositional systems in this complex environment. Supplemental_Information: The publication contains both the raw and processed SEG-Y files, as well as navigation and JPEG images of the profiles. These data were acquired on U.S. Geological Survey field activity 1997-006-FA. More information is available from: https://cmgds.marine.usgs.gov/fan_info.php?fan=1997-006-FA. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19970409 Beginning_Time: 045227 Ending_Date: 19970413 Ending_Time: 131459 Currentness_Reference: not available from original metadata - assumed to be the start and end of the data acquisition Status: Progress: In work Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -92.833333 East_Bounding_Coordinate: -91.916667 North_Bounding_Coordinate: 27.5 South_Bounding_Coordinate: 26.25 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:7217f3c2-ece9-4b06-838b-d00dd646863f Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: seismic reflection Theme_Keyword: Seismic Systems Inc. Theme_Keyword: GI Air Gun Theme_Keyword: SEG-Y Theme_Keyword: ISO 9660 CD-ROM Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: sub-bottom profiling Theme_Keyword: marine geophysics Theme_Keyword: navigational data Theme_Keyword: seismic reflection methods Theme_Keyword: image collections Theme_Keyword: marine geology Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: None Place_Keyword: Gulf of Mexico Place_Keyword: Louisiana Place_Keyword: LA Place_Keyword: continental slope Place_Keyword: R/V GYRE Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Twichell, Dave Contact_Organization: U.S. Geological Survey Contact_Position: Seafloor Mapping Project Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey Woods Hole Field Center 384 Woods Hole Road Quissett Campus City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dtwichell@usgs.gov Data_Set_Credit: D. Twichell, D. Nichols, T. O'Brien, B. Irwin, V. Cross, M. Taylor D. Foster, B. Danforth, S. Harrison, J. Brand, C. Spagnuolo Native_Data_Set_Environment: ISO 9660 Data_Quality_Information: Logical_Consistency_Report: information not available from original metadata Completeness_Report: archive of SEG-Y format seismic data Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The ship was navigated with differential GPS The GI air gun was towed 10 m aft of the ship The two-channel streamer was towed 100 m aft of the ship. Each channel consisted of a 25 m length of streamer. accurate within 5-10 meters Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Value: 10 Horizontal_Positional_Accuracy_Explanation: the ship position is accurate within 5-10 meters Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The air gun was towed at depth of 1 meter. The streamer was towed at a depth of 5 meters. Vertical resolution of the seismic data is about 1-2 meters. There was no correction to a datum such as mean sea level. Quantitative_Vertical_Positional_Accuracy_Assessment: Vertical_Positional_Accuracy_Value: 2 Vertical_Positional_Accuracy_Explanation: The accuracy is assumed to be within 1-2 meters Lineage: Process_Step: Process_Description: The original SEG-Y files were acquired from David C. Twichell on CD-ROM. Flow 1 : load file and geometry 2D Marine geometry spreadsheet Seg-Y Input File to input: Raw.seg-y Store Processing History:Yes Input Auxiliary Traces: Yes Get Channel Number from Trace Headers: Yes Input Trace Format: Get from Headers Display ensemble Formation: No Data Input Sample Rate: 0.5 msec Maximum Time to input: variable Is this Stacked Data: No Max Traces Per Ensemble: 120 Primary Sort Header Word: SHOT Input Primary Selection Choice:Input all Input secondary selection Choice:None Input global XY coordinates: No Use coordinate Scalar: Yes Remap Seg-Y header Values: No Inline Geometry header Load water velocity: 1525 Primary header to match database: FFID Secondary Header to match database: None Match by Valid trace Number: NO Drop traces with Null CDP headers: No Drop Traces with Null receiver Headers: No Verbose Diagnostics: YES Trace header Math select Mode:fixed equation Mode define header equation:FFID =CDP Disk Data Output output dataset file Name: geom New or existing file:New record length to output:0(default parameter means include all) Trace sample format:16 bit Skip primary disk storage:No Flow 2: Mute and Deconvolution Disk Data Input Read data from other lines/surveys:No Select input file: geom Trace read option: Get all Read data multiple times: No Input trace headers only: No Override input datas sample interval:No Trace Muting Reapply Previous mutes: no Mute time reference:Time 0 Type of Mute: TOP Starting ramp:30 Extrapolate mute times:No Get Mute Times from Database:Yes Select Database:Topmute(Horizon picked ~300 ms above seafloor) True Amplitude recovery Apply spherical divergence corrections: NO Apply inelastic attenuation correction: NO Apply db/sec corrections:YES DB per second constant:6 Apply time raise to a power corrections:NO Time power constant:NO Apply effect to data or remove function:APPLY Maximum application Time: 3500-4000 Spiking Predictive decon Type of deconvolution:MIN PHASE SPIKING Decon Operator length:80 Operator white noise level:.1 window rejection length:2 Time gate reference:DATABASE FILE Select decon gate from Database: Yes Select database:DECON Output traces or filters:TRACES Apply a band pass filter after decon:NO Reapply mutes after decon:YES Disk Data Output Output dataset file Name:decon New or existing file:New record length to output:0(default parameter means include all) Trace sample format:16 bit Skip primary disk storage:No Flow 3 Stack Disk Data Input Read data from other lines/surveys: No Select input file:decon Trace read option:sort Primary Sort header word:CDP Secondary sort header word:NONE Sort order dataset:*/ Presort in memory or disk:Memory Read data multiple times:No Input trace headers only: No Override input datas sample interval:No CDP Ensemble Stack sort order of input ensembles:CDP Method of trace summing:Mean root Power scalar for stack normalization:0.5 Apply final datum statics after Stack:Yes Has NMO been applied:No Disk Data Output Output dataset file Name:stack New or existing file:New record length to output:0(default parameter means include all) Trace sample format:16 bit Skip primary disk storage:No Disk Data Input Read data from other lines/surveys:No Select input file:stack Trace read option:get all Read data multiple times:No Input trace headers only:No Override input data's sample interval:No Bandpass Filter Type of Filter:single filter Type of filter specification:ormsby bandpass Phase of filter:Zero domain of filter application:Frequency Percent zero padding for FFT:25 Apply notch filter:no Ormbsby bandpass filter values:4-8-100-150 Reapply trace mute after filter:yes Seg-Y Output type of seg-y:standard file name:line1pro.sgy Retrieve history form header:yes copy reel header:default job id for binary header:9999 line number for binary header:9999 desired trace format:4 bit integer maximum time to output:variable remap seg-y header values:no Process_Date: unknown Process_Step: Process_Description: Add the larger work citation to incorporate all the authors. Fixed errors flagged by MP, which results in "information not available from original metadata" in some instances. Added the field activity to the supplemental information. Added USGS Thesaurus and ISO 19115 Topic Category theme keywords. Removed the source citation information - and moved the brief information to the first process step. Removed empty, non-required fields. Updated the distribution information. Modified the distribution information to include the data formats and links to the data. The metadata date (19970408), but not the contact (except email and contact instructions) was updated. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. Process_Date: 20220119 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20240806 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Gulf of Mexico, Louisiana Continental Slope Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 15 Transverse_Mercator: Scale_Factor_at_Central_Meridian: .9997 Longitude_of_Central_Meridian: -93 Latitude_of_Projection_Origin: 0 False_Easting: 0 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 5 Ordinate_Resolution: 5 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298257 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: assumed sea level Altitude_Resolution: 1 Altitude_Distance_Units: two-way travel time Altitude_Encoding_Method: Attribute values Depth_System_Definition: Depth_Datum_Name: fish depth below sea level (local surface) Depth_Resolution: 1 Depth_Distance_Units: meters Depth_Encoding_Method: Attribute values Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Direct_spatial_Reference_method: raster Raster_Object Information: Raster_Object_Type: Voxel Row_Count: > 10000 Column_Count: 1 Vertical Count: 4096 Entity_and_Attribute_Detail_Citation: Based on the direct spatial reference method in the original metadata that didn't meet the standard formatting requirements. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Soderberg, Nancy Contact_Organization: U.S. Geological Survey Contact_Position: Data Library Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey Woods Hole Field Center 384 Woods Hole Road Quissett Campus City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: nsoderberg@usgs.gov Resource_Description: U.S. Geological Suvey Internal CD-ROM Data Archive Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: SEG-Y Format_Information_Content: SEG-Y for both the raw and processed data. File_Decompression_Technique: none Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://pubs.usgs.gov/of/1999/of99-449/disc1/seg_y/ Network_Resource_Name: https://pubs.usgs.gov/of/1999/of99-449/disc2/seg_y/ Network_Resource_Name: https://pubs.usgs.gov/of/1999/of99-449/disc3/seg_y/ Network_Resource_Name: https://doi.org/10.3133/ofr99449 Access_Instructions: The first link is to access the SEG-Y data on disc 1. The second link is to access the SEG-Y data on disc 2. The third link is to access the SEG0Y data on disk 3. The fourth link is to the main landing page of the publication. Offline_Option: Offline_Media: CD-ROM Recording_Capacity: Recording_Density: 512 Recording_Density_Units: bytes Recording_Format: ISO 9660 Compatibility_Information: UNIX, DOS, MAC Digital_Form: Digital_Transfer_Information: Format_Name: JPEG Format_Information_Content: JPEG images of the processed seismic data. Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://pubs.usgs.gov/of/1999/of99-449/disc1/html_docs/images.html Network_Resource_Name: https://doi.org/10.3133/ofr99449 Access_Instructions: The first link is to the landing page of the profile images. The second link is to the main landing page of the publication. Digital_Form: Digital_Transfer_Information: Format_Name: TEXT Format_Information_Content: Text files of the navigation data. Includes raw navigation files (*.raw), space-delimited formatted navigation files (*.txy), and tab-delimited shot point navigation (*.txt). Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://pubs.usgs.gov/of/1999/of99-449/disc1/html_docs/nav.html Network_Resource_Name: https://pubs.usgs.gov/of/1999/of99-449/disc1/nav/ Network_Resource_Name: https://doi.org/10.3133/ofr99449 Access_Instructions: The first link is to the landing page of the navigation files. The second link is online folder of the navigation files because the link to the shot-point navigations files is broken from the navigation landing page. The third link is to the main landing page of the publication. Fees: none for the online data Metadata_Reference_Information: Metadata_Date: 20240806 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Foster, David Contact_Organization: U.S. Geological Survey Contact_Position: Geophysics Group Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey Woods Hole Field Center 384 Woods Hole Road Quissett Campus City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS. Metadata_Standard_Name: FGDC Content Standard Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: universal time