Digital data for depth to basement in the deep-sea basins of the Pacific continental margin (cowbsm) based on data collected in 1984.

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Muriel S. Grim
Originator: Florence L. Wong
Publication_Date: 2015
Title:
Digital data for depth to basement in the deep-sea basins of the Pacific continental margin (cowbsm) based on data collected in 1984.
Edition: Version 1.0, 2012
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz and Menlo Park, CA
Publisher: U.S. Geological Survey
Larger_Work_Citation:
Citation_Information:
Originator: Florence L. Wong
Originator: Muriel S. Grim
Publication_Date: 2015
Title:
Depth-to-basement, sediment-thickness, and bathymetry data for the Deep-Sea Basins offshore of Washington, Oregon, and California
Edition: 1
Geospatial_Data_Presentation_Form: GIS Data Project/Collection
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2015-1118
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2015/1118
Online_Linkage: https://doi.org/10.3133/ofr20151118
Description:
Abstract:
Digital vector data for the contours of depth to basement for the deep-sea basins of the Pacific continental margin offshore of Washington, Oregon, and California. The data were interpreted from GLORIA (Paskevich and others, 2011) sidescan data and related seismic-reflection data. The data were published as USGS maps in paper format (Gardner and others, 1992, 1993a, 1993b).
Purpose:
These data are intended for science researchers, students, policy makers, and the general public. The data can be to display geologic and oceanographic information.
Supplemental_Information:
Additional information about the field activities fromwhich this data set was derived are available online at
https://cmgds.marine.usgs.gov/fan_info.php?fan=f184sc https://cmgds.marine.usgs.gov/fan_info.php?fan=f284nc https://cmgds.marine.usgs.gov/fan_info.php?fan=f384nc https://cmgds.marine.usgs.gov/fan_info.php?fan=f484wo
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology.

------------------

(modified from Gardner and others, 1992)

The U.S. Geological Survey conducted a series of cruises in 1984, EEZSCAN 84 (EEZ-SCAN 84 Scientific Staff, 1986; U.S. Geological Survey activities F-1-84-SC, F-2-84-NC, F-3-84-NC, F-4-84-WO), to collect reconnaissance data on the newly proclaimed Exclusive Economic Zone (EEZ), the area out to 200 nautical miles from the coastline of the United States. The cruises systematically surveyed the entire conterminous United States west coast EEZ using the Geological Long-Range Inclined Asdic (GLORIA) side-scan sonar, a 160-cubic-inch airgun seismic-reflection profiler, a 3.5-kHz high-resolution seismic-reflection profiler, a 10-kHz echo sounder, and a proton-precession magnetometer. The nominal trackline spacing throughout the survey was 30 km.

Derivative maps of sediment thickness (Gardner and others, 1992a, 1993a, 1993b) and depth to basement (Gardner and others, 1992b, 1993c, 1993d)) in the basins of the west coast EEZ were compiled from both the sonar-image data and the deep-penetration seismic data obtained on these cruises. Only EEZ-SCAN 84 data were used for the map compilations because available data from other cruises in this region are sparsely located, have poor navigational control, or were obtained with seismic systems that were not powerful enough to resolve oceanic basement. Sediment thickness and depth to basement were determined only in the deep-ocean basin regions because the seismic system used on the EEZ-SCAN 84 cruises could not resolve oceanic basement beneath the thick sediments of the continental slope. All the data used to compile the maps are presented in the "Atlas of the Exclusive Economic Zone, Western Conterminous United States" (EEZ-SCAN 84 Scientific Staff, 1986) and are now available online (Paskevich and others, 2011).

Basement Outcrops

GLORIA imagery was used to locate areas of basement outcrop throughout the region. Where possible, sediment thickness on and immediately adjacent to basement outcrops was measured from seismic data. Where there was no bathymetric or seismic control, a seamount peak was assumed to have no sediment cover.

Data Reduction

Acoustic basement in the basins, invariably oceanic Layer 2, was observed on all of the seismic records. One-way traveltime was measured from the seafloor to acoustic basement. Because the trackline spacing of about 30 km is relatively large compared to the data density along track, the sediment thickness was measured every 0.5 hour or at an interval of approximately 7.5 km. Water depth was measured with a 10-kHz profiler. Depth to basement was calculated using the sea surface as the zero datum and adding the corrected water depth (Carter, 1980) to the sediment thickness. Acoustic travel times were converted to depths by first calculating a regression equation from the interval velocity versus depth data of Connard and others (1984). Their data base comprises a compilation of all available Deep Sea Drilling Project data plus wide-angle refraction data, which were collected in Cascadia Basin west of Oregon and represents the best data set available for the United States west coast EEZ. The regression equation was integrated to determine sediment thickness as a function of one-way traveltime. The resulting equation is

z = 1400t + 0 .5t ^ 2

where z is sediment thickness in meters, and t is one-way traveltime in seconds. Sediment thicknesses calculated using this equation were compared to values calculated from the general equation of Carlson and others (1986). Values for sediment thickness calculated by the two equations differed by no greater than 10 percent throughout the range of travel times.

References Cited

Carlson, R.L., Gangi, A.F., and Snow, K.R., 1986, Empirical reflection-traveltime/ depth and velocity/depth functions for the deep-sea sediment column: Journal of Geophysical Research, v. 91, no. B8, p. 8249-8266.

Carter, D.J.T., 1980, Echo-sounding correction tables: Taunton, United Kingdom, Hydrographic Department, Ministry of Defence, 150 p.

Chase, T.E., Wilde, Pat, Normark, W.R, Miller, C.P., Seekins, B.A., and Young, J.D., 1981, Offshore topography of the Western United States between 32 and 49 North latitudes: U.S. Geological Survey Open-File Report 81-443, scale 1:864,518 at 38 latitude, 2 sheets, http://pubs.er.usgs.gov/publication/ofr81443

Connard, G., Couch, R., Keeling , K., Roy, J., and Troseth, S., 1984, Abyssal plain and continental net-objective sedimentary thicknesses, in Kulm, L.D., and others, eds., Western North America continental margin and adjacent ocean floor off Oregon and Washington, Atlas 1 of Regional Atlas Series, Ocean Margin Drilling Program: Woods Hole, Mass., Marine Science International, sheet 7.

EEZ-SCAN 84 Scientific Staff, 1986, Atlas of the Exclusive Economic Zone, Western Conterminous United States: U.S. Geological Survey Miscellaneous Investigations Series I-1792, scale 1:500,000, 152 p., http://pubs.er.usgs.gov/publication/i1792
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1984
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -131.0851
East_Bounding_Coordinate: -119.0350
North_Bounding_Coordinate: 48.3066
South_Bounding_Coordinate: 30.7495
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:a759520f-d522-4014-b4f9-fcf06acfc3c2
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: marine geology
Theme_Keyword: seismic reflection methods
Theme_Keyword: maps and atlases
Theme_Keyword: stratigraphic thickness
Theme_Keyword: geospatial datasets
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: GLORIA
Theme_Keyword: EEZ
Theme_Keyword: exclusive economic zone
Theme_Keyword: depth to basement
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: Oceans > marine geophysics
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Washington
Place_Keyword: Oregon
Place_Keyword: California
Place_Keyword: USA
Place_Keyword: Pacific Ocean
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: north Pacific Ocean
Place_Keyword: northeastern Pacific
Access_Constraints: None
Use_Constraints:
These data are not to be used at scales greater than 1:500,000.

This information is not intended for navigational purposes.

Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.

Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.

This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.

Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: US
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2015/1118/cowbsm.jpg
Browse_Graphic_File_Description: thumbnail image of cowbsm.shp
Browse_Graphic_File_Type: JPEG
Native_Data_Set_Environment:
Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.2 (Build 3552) Service Pack [N/A] (Build [N/A])
Cross_Reference:
Citation_Information:
Originator: Gardner, J.V.
Originator: Cacchione, D.A.
Originator: Drake, D.E.
Originator: Edwards, B.D.
Originator: Field, M.E.
Originator: Hampton, M.A.
Originator: Karl, H.A.
Originator: Kenyon, N.H.
Originator: Masson, D.G.
Originator: McCulloch, D S
Originator: Grim, M S
Publication_Date: 1992
Title:
Map showing depth to basement in the deep-sea basins of the Pacific continental margin, Point Conception to Point Loma
Geospatial_Data_Presentation_Form: paper map
Series_Information:
Series_Name: Miscellaneous Investigations Series
Issue_Identification: I-2089-A, 1 sheet
Other_Citation_Details: scale: 1:1,000,000; Gardner and others (1992)
Online_Linkage: http://pubs.usgs.gov/imap/2089/a/
Cross_Reference:
Citation_Information:
Originator: Gardner, J.V.
Originator: Cacchione, D.A.
Originator: Drake, D.E.
Originator: Edwards, B.D.
Originator: Field, M.E.
Originator: Hampton, M.A.
Originator: Karl, H.A.
Originator: Kenyon, N.H.
Originator: Masson, D.G.
Originator: McCulloch, D S
Originator: Grim, M S
Publication_Date: 1993
Title:
Map showing depth to basement in the deep-sea basins of the Pacific continental margin, Cape Mendocino to Point Conception
Geospatial_Data_Presentation_Form: paper map
Series_Information:
Series_Name: Miscellaneous Investigations Series
Issue_Identification: I-2090-A, 1 sheet
Other_Citation_Details: scale: 1:1,000,000; Gardner and others (1993a)
Online_Linkage: http://pubs.usgs.gov/imap/2090/a/
Cross_Reference:
Citation_Information:
Originator: Gardner, J.V.
Originator: Cacchione, D.A.
Originator: Drake, D.E.
Originator: Edwards, B.D.
Originator: Field, M.E.
Originator: Hampton, M.A.
Originator: Karl, H.A.
Originator: Kenyon, N.H.
Originator: Masson, D.G.
Originator: McCulloch, D S
Originator: Grim, M S
Publication_Date: 1993
Title:
Map showing depth to basement in the deep-sea basins of the Pacific continental margin, Strait of Juan de Fuca to Cape Mendocino
Geospatial_Data_Presentation_Form: paper map
Series_Information:
Series_Name: Miscellaneous Investigations Series
Issue_Identification: I-2091-A, 1 sheet
Other_Citation_Details: scale: 1:1,000,000; Gardner and others (1993b)
Online_Linkage: http://pubs.usgs.gov/imap/2089/a/
Cross_Reference:
Citation_Information:
Originator: Paskevich, Valerie F.
Originator: Wong, Florence L.
Originator: O'Malley, John J.
Originator: Stevenson, Andrew J.
Originator: Gutmacher, Christina E.
Publication_Date: 2011
Title:
GLORIA sidescan-sonar imagery for parts of the U.S. Exclusive Economic Zone and adjacent areas
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2010-1332
Publication_Information:
Publication_Place: Menlo Park, California
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2010/1332/
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: Not available.
Logical_Consistency_Report: Attributes mean the same thing throughout the data set.
Completeness_Report: Complete
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Comparison of lines delimiting seamounts and ETOPO1 contours indicate a horizontal offset of as much as 10 km in random directions.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Not determined.
Lineage:
Process_Step:
Process_Description:
Muriel Grim digitized and edited mylar source maps provided by J.V. Gardner. Original data were formatted for MAPGEN application (Evenden, 1985; Grim, 1992). Processing date is approximated.
Process_Date: 1990
Process_Step:
Process_Description:
Florence Wong converted data files to ArcInfo format. Processing date is approximated.
Process_Date: 1993
Process_Step:
Process_Description:
ArcInfo coverage converted to shapefile and projected to geographic coordinate system.
Process_Date: 2011
Process_Step:
Process_Description:
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
Process_Date: 20201019
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:
Edited metadata to add USGS Thesaurus keywords and perform minor edits to bring the metadata up to current PCMSC standards. No data were changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent.
Process_Date: 20211021
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Susan Cochran
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-460-7545
Contact_Electronic_Mail_Address: scochran@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 1257
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal seconds
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
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: Attribute Table
Entity_Type_Definition:
Table containing attribute information associated with the data set.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: LTYPE
Attribute_Definition: Vector line feature type
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: depth2bsmt
Enumerated_Domain_Value_Definition: contour of depth to basement
Enumerated_Domain_Value_Definition_Source: Producer defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: nodata
Enumerated_Domain_Value_Definition: seamount boundary, depth unknown
Enumerated_Domain_Value_Definition_Source: Producer defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: scratch
Enumerated_Domain_Value_Definition: boundary enclosing data
Enumerated_Domain_Value_Definition_Source: Producer defined
Attribute:
Attribute_Label: DEPTH_M
Attribute_Definition: depth to basement
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -5400
Range_Domain_Maximum: -800
Attribute_Units_of_Measure: meter
Attribute:
Attribute_Label: LENGTH_M
Attribute_Definition: Vector length
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 46
Range_Domain_Maximum: 1040810
Attribute_Units_of_Measure: meter
Overview_Description:
Entity_and_Attribute_Overview:

Additional DEPTH_M values:
 -9999 = scratch boundary
 -9998 = boundary of seamount peak (mapped from GLORIA imagery) with undefined depth

Seamount peaks were mapped only for the central area between Cape Mendocino and Point Conception.
Entity_and_Attribute_Detail_Citation:
The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Florence L. Wong
Contact_Position: Geologist, GIS Coordinator
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) 329-5327
Contact_Facsimile_Telephone: (650) 329-5190
Contact_Electronic_Mail_Address: fwong@usgs.gov
Resource_Description: cowbsm_shp.zip
Distribution_Liability:
This information is not intended for navigational purposes.

This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.

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: shapefile
Format_Version_Number: Esri ArcGIS 10.2.2
Format_Information_Content:
This WinZip (v.14) file contains the shapefile of the contours of depth to basement, browse graphic, ArcGIS layer file, and the associated metadata files.
Transfer_Size: 0.6
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: None. No fees are applicable for obtaining the data set.
Metadata_Reference_Information:
Metadata_Date: 20211021
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: US
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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