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Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: Arthur Grantz, Patrick E. Hart, and Steven D. May

Publication_Date: 2004

Title:

Seismic reflection and refraction data acquired in 1988, 1992, and 1993 in the Canada Basin, Northwind Ridge, and Northwind Basin, Arctic Ocean; USGS Open-File Report

Geospatial_Data_Presentation_Form:

Text report containing graphical map images and geophysical data images (no spatial referencing).

Online_Linkage: <http://pubs.usgs.gov/of/2004/1243/>

Description:

Abstract:

Seismic reflection and refraction data were collected in generally ice-covered waters of the Canada Basin and the eastern part of the Chukchi Continental Borderland of the Amerasia Basin, Arctic Ocean, during the late summers of 1988, 1992, and 1993. The data were acquired from a Polar class icebreaker, the U.S. Coast Guard Cutter Polar Star, using a seismic reflection system designed by the U.S. Geological Survey (USGS). The northernmost data extend to 78° 48' N latitude.

In 1988, 155 km of reflection data were acquired with a prototype system consisting of a single 195 cubic inch air gun seismic source and a two-channel hydrophone streamer with a 150-m active section. In 1992 and 1993, 500 and 1,900 km respectively of seismic reflection profile data were acquired with an improved six air gun, 674 to 1303 cubic inch tuned seismic source array and the same two-channel streamer. All data were recorded with a DFS-V digital seismic recorder. A 12-channel streamer with a 150-m active section was also used to record some data in 1993. Processed sections feature high quality vertical incidence images to more than 6 km of sub-bottom penetration in the Canada Basin.

Refraction data were acquired with U.S. Navy sonobuoys recorded simultaneously with the seismic reflection profiles. In 1988 eight refraction profiles were recorded with the single air gun, and in 1992 and 1993 a total of 47 refraction profiles were recorded with the six air gun array. The sonobuoy refraction records, with offsets up to 35 km, provide acoustic velocity information to complement the short-offset reflection data.

The report includes trackline maps showing the location of the data, as well as both digital data files (SEG-Y) and images (TIFF and JPEG) of all of the profiles.

Purpose:

These data are intended for science researchers, policy makers, and the general public.

Supplemental_Information:

Information for USGS Coastal and Marine Geology related activities are online at: <http://walrus.wr.usgs.gov/>

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19880801

Ending_Date: 19931001

Currentness_Reference: none

Browse_Graphic:

Browse_Graphic_File_Name: <http://pubs.usgs.gov/of/2004/1243/rjpg/93-04rp.html>

Browse_Graphic_File_Description: An example seismic reflection Line 93-04

Browse_Graphic_File_Type: JPEG

Status:

Progress: Complete

Maintenance_and_Update_Frequency: none planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -165.00000

East_Bounding_Coordinate: -137.00000

North_Bounding_Coordinate: +79.00000

South_Bounding_Coordinate: +71.00000

Keywords:

Theme:

Theme_Keyword_Thesaurus:

NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 4.2.2

Theme_Keyword:

Parameters Keywords > OCEANS > MARINE SEDIMENTS > STRATIGRAPHIC SEQUENCE

Theme_Keyword: Parameters Keywords > SOLID EARTH > ROCKS/MINERALS > SEDIMENTS

Theme_Keyword:

Parameters Keywords > SOLID EARTH > SEISMOLOGY > SEISMIC PROFILE

Theme_Keyword: Platform Keywords > SHIPS

Theme_Keyword: Instrument Keywords > AIRGUN ARRAYS

Theme_Keyword: Instrument Keywords > GEOPHONES

Theme_Keyword: Instrument Keywords > HYDROPHONES

Theme_Keyword: Instrument Keywords > SONOBUOYS

Theme_Keyword: Instrument Keywords > SEISMIC REFLECTION PROFILERS

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: marine geology

Theme_Keyword: seismic reflection

Theme_Keyword: seismic refraction

Theme_Keyword: airgun

Theme_Keyword: sediment thickness

Theme_Keyword: ice breaker

Place:

Place_Keyword_Thesaurus:

NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 4.2.2

Place_Keyword: Location Keywords > ARCTIC OCEAN

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS), USGS, Reston, VA

Place_Keyword: Arctic Ocean

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Canada Basin

Place_Keyword: Chukchi Basin

Place_Keyword: Chukchi Plateau

Place_Keyword: Northwind Ridge

Place_Keyword: Amerasian Basin

Place_Keyword: Alaska

Place_Keyword: USA

Access_Constraints: None

Use_Constraints:

These data are not intended for navigational purposes. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Patrick E. Hart

Contact_Organization:

United States Geological Survey (USGS) Coastal and Marine Geology (CMG)

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address

Address: USGS, MailStop 999, 345 Middlefield Road

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025-3561

Country: USA

Contact_Voice_Telephone: (650) 329-5160

Contact_Electronic_Mail_Address: phart@usgs.gov

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: Data have not been independently verified.

Logical_Consistency_Report: Undetermined

Completeness_Report: Reference the full report for a description of data coverage.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: 100.0 meters

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: Depths are referenced to sea level

Lineage:

Process_Step:

Process_Description:

Refer to report section "Data processing and archive" for full details of geophysical data processing sequences

Process_Date: 2004

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Patrick E. Hart

Contact_Organization:

United States Geological Survey (USGS) Coastal and Marine Geology (CMG)

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address

Address: USGS, MailStop 999, 345 Middlefield Road

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025-3561

Country: USA

Contact_Voice_Telephone: (650) 329-5160

Contact_Electronic_Mail_Address: phart@usgs.gov

Process_Step:

Process_Description:

Plotted tracklines of seismic reflection profiles using GMT to create Figure 4. Converted plot to Adobe SVG Viewer file to allow mouse over trackline details and links to profile displays.

Process_Date: 2004

Process_Step:

Process_Description:

Plotted tracklines of sonobuoy refraction profiles using GMT to create Figure 5. Converted plot to Adobe SVG Viewer file to allow mouse over trackline details and links to profile displays.

Process_Date: 2004

Process_Step:

Process_Description:

Plotted shot point map of cruises using GMT to create Figure 10. Broke area into three sections for better viewing. Converted plots to Adobe Acrobat PDF files for zooming in on sections.

Process_Date: 2004

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jon R. Childs

Contact_Organization:

United States Geological Survey (USGS) Coastal and Marine Geology (CMG)

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address

Address: USGS, MailStop 999, 345 Middlefield Road

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025-3561

Country: USA

Contact_Voice_Telephone: (650) 329-5195

Contact_Electronic_Mail_Address: jchilds@usgs.gov

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Azimuthal

Polar_Stereographic:

Straight-Vertical_Longitude_from_Pole: -155.0

Standard_Parallel: 90.0

False_Easting: 0.0

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.00001

Ordinate_Resolution: 0.00001

Planar_Distance_Units: degrees

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Locations of data profiles are shown as color-coded map images at an unspecified projection and scale. These map images are rendered in Scalable Vector Graphics (SVG). The images of the reflection and refraction profiles are rendered in TIFF and JPEG image formats.

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

United States Geological Survey (USGS) Information Services

Contact_Address:

Address_Type: mailing and physical address

Address: Box 25286

City: Denver

State_or_Province: CO

Postal_Code: 80225

Country: USA

Contact_Voice_Telephone: (888)ASK-USGS

Distribution_Liability:

Please recognize the U.S. Geological Survey (USGS) as the source of this information.

USGS-authored or produced data and information are in the public domain.

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user.

Neither the U.S. Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.

Trade, firm, or product names and other references to commercial products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: TIFF, JPEG, SEG-Y, ASCII

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://pubs.usgs.gov/of/2004/1243/>

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20030810

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jonathan R. Childs

Contact_Organization:

United States Geological Survey (USGS) Coastal and Marine Geology (CMG)

Contact_Position: Geophysicist

Contact_Address:

Address_Type: mailing and physical address

Address: USGS, MailStop 999, 345 Middlefield Road

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025-3561

Country: USA

Contact_Voice_Telephone: (650) 329-5195

Contact_Electronic_Mail_Address: jchilds@usgs.gov

Metadata_Standard_Name:

Content Standard for Digital Geospatial Metadata ("CSDGM version 2")

Metadata_Standard_Version: FGDC-STD-001-1998