Reprocessing of Multi-channel Seismic-Reflection Data Collected in the Beaufort Sea, by Warren F. Agena, Myung W. Lee, and Pat E. Hart

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
U.S. Geological Survey/Geologic Division/Central Energy Research Team
Publication_Date: 2000
Title:
Reprocessing of Multi-channel Seismic-Reflection Data Collected in the Beaufort Sea, by Warren F. Agena, Myung W. Lee, and Pat E. Hart
Edition: 1
Geospatial_Data_Presentation_Form: Section

Description:
Abstract:
Contained on this set of two CD-ROMs are stacked and migrated multi-channel seismic-reflection data for 65 lines recorded in the Beaufort Sea by the United States Geological Survey in 1977. All data were reprocessed by the USGS using updated processing methods resulting in improved interpretability. Each of the two CD-ROMs contains the following files: 1) 65 files containing the digital seismic data in standard, SEG-Y format; 2) 1 file containing navigation data for the 65 lines in standard SEG-P1 format; 3) an ASCII text file with cross-reference information for relating the sequential trace numbers on each line to cdps and shotpoint numbers; 4) 2 small scale graphic images (stacked and migrated) of a segment of line 722 in Adobe Acrobat (R) PDF format; 5) a graphic image of the location map, generated from the navigation file; 6) PlotSeis, an executable image that allows PC users to interactively view the included SEG-Y files; 7) A PlotSeis documentation file; and 8) an explanation of the processing used to create the final seismic sections (this document).
Purpose:
The data and associated support information contained on this CD-ROM are the complete, processed data set from 65 seismic lines recorded off the north slope of Alaska in the Beaufort Sea from August through October of 1977. The information contained here is sufficient to allow the user to load the data onto an interactive seismic interpretation workstation and interpret the data.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19770815
Ending_Date: 19771031

Currentness_Reference:
Field data collected in 1977 and assumed to be "constant" with time.

Status:
Progress: Complete
Maintenance_and_Update_Frequency: None Planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -159.74008
East_Bounding_Coordinate: -141.00226
North_Bounding_Coordinate: 72.733
South_Bounding_Coordinate: 69.754

Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Offshore Geophysics
Theme_Keyword: Seismic Reflection
Theme_Keyword: Geophones
Theme_Keyword: 2-dimensional Seismic Data
Theme_Keyword: Time migration
Theme_Keyword: Deconvolution
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Alaska
Place_Keyword: Beaufort Sea

Access_Constraints: None

Use_Constraints:
Please recognize the U.S. Geological Survey (USGS) as the source of this information. This Compact Disc (CD) publication is 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 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 necessarily 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 CD-ROM 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.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Organization: USGS/Geologic Division/Central Region Energy Team

Contact_Person: Warren F. Agena

Contact_Position: Geophysicist
Contact_Address:
Address_Type: Mailing and physical address
Address: USGS Energy Team
Address: Bldg. 25, Rm. 2827-D, MS-939, Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA

Contact_Voice_Telephone: 303-236-5751
Contact_TDD/TTY_Telephone: none
Contact_Facsimile_Telephone: 303-236-8822
Contact_Electronic_Mail_Address: wagena@usgs.gov

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of field data conform to digital seismic data recording standards, commercially available in 1977. The reprocessed data conform to accuracy in digital seismic data processing techniques and algorithms commonly available in 1999 through 2000.

Logical_Consistency_Report: Not Applicable

Completeness_Report:
Sufficient supporting data are included The SEG-Y data files, survey coordinates and a graphical image of the location map are sufficient to allow the user to load the data onto an interactive seismic interpretation workstation and interpret the data.

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The latitude and longitude of shotpoints were obtained using a Marconi (R) integrated sattelite-doppler sonar. Depending on the line, location positions were determined every 10th or 50th shotpoint.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
All data on this marine survey were shot and recorded at sea-level.

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
U.S. Geological Survey aboard the USGS research vessel Samuel P. Lee.
Title: Unpublished
Publication_Date: Unknown

Type_of_Source_Media:
Globe Universal Sciences(GUS) (R) formatted digital magnetic tape
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19770815
Ending_Date: 19771031

Source_Currentness_Reference: Observer log

Source_Citation_Abbreviation: None
Source_Contribution: Seismic data field tapes, Observers' logs, Survey notes

Process_Step:
Process_Description:
Orginal data were recorded onto magnetic tape using a Globe Universal Sciences (R) model 4200 digital recording instrument. The data were then demultiplexed by the USGS in Menlo Park, California. Processing steps for the data on these CD-ROMS included 1) geometry definition; 2) static corrections to remove deep-water delays; 3) pre-stack gain corrections; 4) pre-stack minimum phase spiking deconvolution; 5) velocity analysis and Normal Moveout (NMO) corrections; 6) trace weighting; 7) stack (nominally 12-fold); 8) post-stack deconvolution and wavelet processing; 9) F-K migration; and 10) SEG-Y data output.

Process_Date: 1999-2000

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
Map

Direct_Spatial_Reference: Survey Notes; calculated latitude and longitude 10th or 50th shotpoint, varying by line.

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.00001
Longitude_Resolution: 0.00001
Geographic_Coordinate_Units: Decimal degrees

Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Sea Level
Depth_Resolution: 4.0
Depth_Distance_Units: ms
Depth_Encoding_Method: attribute values

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: Technical Information in ASCII format
Entity_and_Attribute_Detail_Citation:
File "A_README.TXT" in ASCII format giving Abstract, Introduction, description of the reprocessing performed, navigation conventions used. References, 3 figure captions
Entity_and_Attribute_Overview: Technical Information in word processor format
Entity_and_Attribute_Detail_Citation:
File "Beaufort.DOC" in MS Word 2000 format giving Abstract, Introduction, description of the reprocessing performed, navigation conventions used. References, 3 figure captions. File contains hyperlinks to a survey map (Figure 1), and a segment of line 722 both stacked, (Figure 2) and migraged (Figure 3) all in a PDF-format.
Entity_and_Attribute_Overview: Technical Information in internet format
Entity_and_Attribute_Detail_Citation:
File "Beaufort.HTM" in ".html" (internet) format giving Abstract, Introduction, description of the reprocessing performed, navigation conventions used. References, 3 figure captions. File contains hyperlinks to a survey map (Figure 1), and a segment of line 722 both stacked, (Figure 2) and migrated (Figure 3) all in a PDF-format.
Entity_and_Attribute_Overview: Map file Figure1.PDF in Adobe Acrobat (R) PDF format
Entity_and_Attribute_Detail_Citation:
Map plotted from SEG-P1 format navigation file containing tracklines of the 65 lines included on thesed CD-ROMs
Entity_and_Attribute_Overview: Seismic Line Images in PDF-format
Entity_and_Attribute_Detail_Citation:
Two (2) Digital Images of Seismic Displays (Files Figure2.PDF and Figure3.PDF): Small scale displays of a segment of line 722 both stacked, and migrated, generated from a GEOGRAPHIX/SEISVISION work station.
Entity_and_Attribute_Overview:
Support Data - Navigation File BEAUFORT.SEG in SEG-P1 format (ASCII text)
Entity_and_Attribute_Detail_Citation:
This is the location data in SEG-P1 format, the standard format for latitude, longitude, x, and y coordinate, and surface elevation, as defined by the Society of Exploration Geophysicists. Navigation information is given for the first and last shotpoint of each line and depending on the line, every 10th or 50th shotpoint.
Entity_and_Attribute_Overview:
Support Data - Cross Reference File CDP_SP.TXT in ASCII text format
Entity_and_Attribute_Detail_Citation:
This file contains a table with cross-reference information for relating the sequential trace numbers on each line to cdps and shotpoint numbers.
Entity_and_Attribute_Overview:
SEG-Y format seismic data - vertical coordinate is two-way travel time.
Entity_and_Attribute_Detail_Citation:
Sixty-five (65) Seismic Data Files: CD-ROM 1 of 2 contains stacked versions, CD-ROM 2 of 2 contains migrated versions. These are the processed seismic data in SEG-Y format. The SEG-Y seismic data format standard was developed by the Society of Exploration Geophysicists (SEG) in 1975 and has been in common use throughout the geophysical industry since that time. The data samples are type 2: fixed point integer (2 bytes (16-bits) per sample); trace length is between 6 and 8 seconds two-way travel time; sample interval is 4 milliseconds.
Entity_and_Attribute_Overview: Display Software
Entity_and_Attribute_Detail_Citation:
2 files for displaying and examining the SEG-Y format seismic data: 1) Plotseis.exe: DOS program to display seismic data; 2) Plotseis.txt: Documentation for Plotseis.exe

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S.G.S. Earth Science Information Center (ESIC)
Contact_Address:
Address_Type: mailing and physical address
Address:
Box 25286 Building 810 Denver Federal Center
City: Denver
State_or_Province: Colorado
Postal_Code: 80225-0286
Country: USA
Contact_Voice_Telephone: 303-202-4200
Contact_Facsimile_Telephone: 303-202-4188
Contact_Electronic_Mail_Address: infoservices@usgs.gov
Hours_of_Service: 8 a.m. - 4 p.m. U.S. Rocky Mountain Time Zone
Resource_Description:
CD-ROM - "Reprocessing of Multi-channel Seismic-Reflection Data Collected in the Beaufort Sea": Processed, digital seismic data in SEG-Y format and navigation information in SEG-P1 format sufficient to allow the user to load the data onto an interactive seismic interpretation workstation. Also included are a digital map in PDF format, two(2) small graphical images of line 722 (stacked and migrated) in PDF format, a interactive viewer with associated documentation, and an ASCII text file with cross-reference information for relating the sequential trace numbers on each line to cdps and shotpoint numbers.
Distribution_Liability:
Although all data and software published on this CD-ROM 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 (Society of Exploration Geophyicists, Digital Exchange Format "Y")
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Fees: Unknown
Ordering_Instructions:
To order the CD-ROM, contact U.S.G.S. Earth Science Information Center (ESIC) by mail or call 1-800-USA-MAPS.
Technical_Prerequisites:
IBM/PC-compatible software is included on the CD-ROM for viewing the data only. To process or interpret the data you must have software capable of reading SEG-Y format seismic data disk images.
Metadata_Reference_Information:
Metadata_Date: 20001016
Metadata_Review_Date: 20001016
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Agena, Warren F.
Contact_Organization: U.S. Geological Survey - Central Region - Geologic Division
Contact_Position: Geophysicist
Contact_Address:
Address_Type: Mailing and physical address
Address: Bldg. 25, Rm. 2827-D, MS-939, Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA
Contact_Voice_Telephone: 303-236-5751
Contact_Facsimile_Telephone: 303-236-8822
Contact_Electronic_Mail_Address: wagena@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 19940608
Generated by mp on Tue Oct 17 09:25:11 2000