q50thick: Grid of the thickness of sediment above the Pleistocene surface Q50, inner shelf and back-barrier from Virginia border to Cape Lookout, North Carolina (ESRI binary grid, 200 m cell size, UTM Zone 18N, WGS 84)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2013
Title:
q50thick: Grid of the thickness of sediment above the Pleistocene surface Q50, inner shelf and back-barrier from Virginia border to Cape Lookout, North Carolina (ESRI binary grid, 200 m cell size, UTM Zone 18N, WGS 84)
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2011-1015
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage:
<https://pubs.usgs.gov/of/2011/1015/data/seismics/interpretation/q50thick.zip>
Online_Linkage: <https://pubs.usgs.gov/of/2011/1015/data_catalog.html>
Larger_Work_Citation:
Citation_Information:
Originator: E.R. Thieler
Originator: D.S. Foster
Originator: D.M. Mallinson
Originator: E.A. Himmelstoss
Originator: J.E. McNinch
Originator: J.H. List
Originator: E.S. Hammar-Klose
Publication_Date: 2013
Title:
Quaternary Geophysical Framework of the Northeastern North Carolina Coastal System
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2011-1015
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <https://pubs.usgs.gov/of/2011/1015/>
Description:
Abstract:
The northeastern North Carolina coastal system, from False Cape, Virginia, to Cape Lookout, North Carolina, has been studied by a cooperative research program that mapped the Quaternary geologic framework of the estuaries, barrier islands, and inner continental shelf. This information provides a basis to understand the linkage between geologic framework, physical processes, and coastal evolution at time scales from storm events to millennia. The study area attracts significant tourism to its parks and beaches, contains a number of coastal communities, and supports a local fishing industry, all of which are impacted by coastal change. Knowledge derived from this research program can be used to mitigate hazards and facilitate effective management of this dynamic coastal system.
This regional mapping project produced spatial datasets of high-resolution geophysical (bathymetry, backscatter intensity, and seismic reflection) and sedimentary (core and grab-sample) data. The high-resolution geophysical data were collected during numerous surveys within the back-barrier estuarine system, along the barrier island complex, in the nearshore, and along the inner continental shelf. Sediment cores were taken on the mainland and along the barrier islands, and both cores and grab samples were taken on the inner shelf. Data collection was a collaborative effort between the U.S. Geological Survey (USGS) and several other institutions including East Carolina University (ECU), the North Carolina Geological Survey, and the Virginia Institute of Marine Science (VIMS).
The high-resolution geophysical data of the inner continental shelf were collected during six separate surveys conducted between 1999 and 2004 (four USGS surveys north of Cape Hatteras: 1999-045-FA, 2001-005-FA, 2002-012-FA, 2002-013-FA, and two USGS surveys south of Cape Hatteras: 2003-003-FA and 2004-003-FA) and cover more than 2600 square kilometers of the inner shelf. Single-beam bathymetry data were collected north of Cape Hatteras in 1999 using a Furuno fathometer. Swath bathymetry data were collected on all other inner shelf surveys using a SEA, Ltd. SwathPLUS 234-kHz bathymetric sonar. Chirp seismic data as well as sidescan-sonar data were collected with a Teledyne Benthos (Datasonics) SIS-1000 north of Cape Hatteras along with boomer seismic reflection data (cruises 1999-045-FA, 2001-005-FA, 2002-012-FA and 2002-013-FA). An Edgetech 512i was used to collect chirp seismic data south of Cape Hatteras (cruises 2003-003-FA and 2004-003-FA) along with a Klein 3000 sidescan-sonar system. Sediment samples were collected with a Van Veen grab sampler during four of the USGS surveys (1999-045-FA, 2001-005-FA, 2002-013-FA, and 2004-003-FA). Additional sediment core data along the inner shelf are provided from previously published studies.
A cooperative study, between the North Carolina Geological Survey and the Minerals Management Service (MMS cores), collected vibracores along the inner continental shelf offshore of Nags Head, Kill Devils Hills and Kitty Hawk, North Carolina in 1996. The U.S. Army Corps of Engineers collected vibracores along the inner shelf offshore of Dare County in August 1995 (NDC cores) and July-August 1995 (SNL cores). These cores are curated by the North Carolina Geological Survey and were used as part of the ground validation process in this study.
Nearshore geophysical and core data were collected by the Virginia Institute of Marine Science. The nearshore is defined here as the region between the 10-m isobath and the shoreline. High-resolution bathymetry, backscatter intensity, and chirp seismic data were collected between June 2002 and May 2004. Vibracore samples were collected in May and July 2005.
Shallow subsurface geophysical data were acquired along the Outer Banks barrier islands using a ground-penetrating radar (GPR) system. Data were collected by East Carolina University from 2002 to 2005. Rotasonic cores (OBX cores) from five drilling operations were collected from 2002 to 2006 by the North Carolina Geological Survey as part of the cooperative study with the USGS. These cores are distributed throughout the Outer Banks as well as the mainland.
The USGS collected seismic data for the Quaternary section within the Albemarle-Pamlico estuarine system between 2001 and 2004 during six surveys (2001-013-FA, 2002-015-FA, 2003-005-FA, 2003-042-FA, 2004-005-FA, and 2004-006-FA). These surveys used Geopulse Boomer and Knudsen Engineering Limited (KEL) 320BR Chirp systems, except cruise 2003-042-FA, which used an Edgetech 424 Chirp and a boomer system. The study area includes Albemarle Sound and selected tributary estuaries such as the South, Pungo, Alligator, and Pasquotank Rivers; Pamlico Sound and trunk estuaries including the Neuse and Pamlico Rivers; and back-barrier sounds including Currituck, Croatan, Roanoke, Core, and Bogue.
Purpose:
This grid represents the thickness of sediment above Q50, a surface within the Pleistocene, derived from analysis of the high-resolution seismic stratigraphy from the offshore and back barrier of North Carolina, from the Virginia border to Cape Lookout. The purpose of this data set is to map the thickness of sediment above Q50 using high-resolution seismic reflection data. These data were collected by the U.S. Geological Survey during twelve separate research cruises beginning in 1999 and ending in 2004. Approximately 13,600 line-km of high-resolution seismic reflection data were collected along the inner continental shelf and back barrier of North Carolina. These data will be used to characterize the subsurface of the seafloor for regional geologic framework investigations.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19991007
Ending_Date: 20040709
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -76.063585
East_Bounding_Coordinate: -75.303740
North_Bounding_Coordinate: 35.949050
South_Bounding_Coordinate: 34.965678
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: seismic stratigraphy
Theme_Keyword: geologic framework
Theme_Keyword: isopach
Theme_Keyword: subbottom
Theme_Keyword: boomer
Theme_Keyword: chirp
Theme_Keyword: seismic stratigraphy
Theme_Keyword: geologic framework
Theme_Keyword: Pleistocene
Theme_Keyword: depth
Theme_Keyword: grid
Theme_Keyword: seafloor mapping
Theme_Keyword: marine geology
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: field activity serial number 1999-045-FA
Theme_Keyword: field activity serial number 2001-005-FA
Theme_Keyword: field activity serial number 2001-013-FA
Theme_Keyword: field activity serial number 2002-012-FA
Theme_Keyword: field activity serial number 2002-013-FA
Theme_Keyword: field activity serial number 2002-015-FA
Theme_Keyword: field activity serial number 2003-003-FA
Theme_Keyword: field activity serial number 2003-005-FA
Theme_Keyword: field activity serial number 2003-042-FA
Theme_Keyword: field activity serial number 2004-003-FA
Theme_Keyword: field activity serial number 2004-005-FA
Theme_Keyword: field activity serial number 2004-006-FA
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: oceans and estuaries
Theme_Keyword: oceans and coastal
Theme_Keyword: geoscientificInformation
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: North Carolina
Place_Keyword: NC
Place_Keyword: Outer Banks
Place_Keyword: inner shelf
Place_Keyword: back barrier
Place_Keyword: Albemarle Sound
Place_Keyword: Pamlico Sound
Place_Keyword: Duck
Place_Keyword: Cape Hatteras
Place_Keyword: United States
Place_Keyword: North America
Place_Keyword: North Atlantic
Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David S. Foster
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2271
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
<https://pubs.usgs.gov/of/2011/1015/data/seismics/interpretation/q50thick.jpg>
Browse_Graphic_File_Description: Image showing the thickness of sediment above Q50
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
The U.S. Geological Survey (USGS) must be referenced as the originator of the dataset in any future products or research derived from these data.
Native_Data_Set_Environment:
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: Grid values are floating point format
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: 0.1 meters
Attribute_Accuracy_Explanation:
The original data used for gridding were rounded to the nearest 0.1 meter.
Logical_Consistency_Report:
This grid represents interpolated data; processed to account for gaps that occurred along-track and between adjacent survey lines.
Completeness_Report:
All of the original boomer and chirp seismic reflection data were used from U.S. Geological Survey inner shelf and back-barrier cruises 1999-045-FA, 2001-005-FA, 2001-013-FA, 2002-012-FA, 2002-013-FA, 2002-015-FA, 2003-003-FA, 2003-005-FA, 2003-042-FA, 2004-003-FA, 2004-005-FA, and 2004-006-FA.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
All boomer seismic lines from cruises 20010-13-FA, 2002-015-FA, 2003-005-FA, 2004-005-FA, and 2004-006-FA were positioned using Differential GPS (DGPS), with accuracy less than 5 meters. The positions (layback) of the seismic source and receiver were not factored in the shotpoint position. The shotpoint position is relative to the position of the DGPS antenna, not the seismic source. Accuracy is assumed to be approximately 10 meters.
For cruises 1999-045-FA, 2001-045-FA, 2002-012-FA, 2002-013-FA Teledyne Benthos (Datasonics) SIS-1000 chirp lines were positioned using Differential GPS (DGPS), with accuracy less than 5 meters. The position (layback) were factored in the shotpoint position. Uncertainty of layback corrections likely degraded accuracy. The shotpoint position is relative to the DGPS antenna.
For cruises 2003-003-FA and 2004-003-FA a GPS receiver was mounted on the Edgetech 512i Chirp that was towed aft of the ship, one meter below the water surface and positioned without differential corrections resulting in about 30 meters accuracy. Therefore total uncertainty is approximately 30 meters.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Time zero of two-way travel time is relative to local sea surface. No corrections for sea level or tide variation (which is less than 2 meters offshore and less than one meter in Pamlico and Albemarle Sounds) are applied. Vertical resolution of less than one meter of the seismic reflection systems are less than the tidal ranges. Vertical accuracy of the final derived grid is also a function of the vertical accuracy of the NOAA Coastal Relief Model (CRM).
Lineage:
Source_Information:
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19991007
Ending_Date: 20040807
Source_Currentness_Reference: ground condition
Source_Contribution:
1999-045-FA: October 7-27, 1999 2001-005-FA: July 1-18, 2001 2001-013-FA: August 1-17, 2001 2002-012-FA: June 20 - July 5, 2002 2002-013-FA: July 7-20, 2002 2002-015-FA: July 29 - August 16, 2002 2003-003-FA: June 17 - July 1, 2003 2003-005-FA: July 20 - August 10, 2003 2003-043-FA: July 22 - August 10, 2003 2004-003-FA: June 16 - July 9, 2004 2004-005-FA: July 18 - August 07, 2004 2004-006-FA: July 18-31, 2004
Process_Step:
Process_Description:
For boomer data: Back-barrier (2001-013-FA, 2002-015-FA, 2003-005-FA, 2003-042-FA, 2004-005-FA) and inner shelf (1999-045-FA, 2001-005-FA, 2002-012-FA, 2002-013-FA) surveys were acquired using a Triton-Elics Delph Seismic acquisition system. The data were recorded in 16-bit integer standard SEG-Y format. DGPS navigation data were input in realtime to the acquisition system through HYPACK navigation software. The data are stored in the SEG-Y trace headers as UTM Zone 18 coordinates (meters).
Back-barrier survey 2004-006-FA was acquired with a Delph Seismic Plus acquisition system with geographic coordinates in the SEG-Y header.
For chirp data: Inner shelf chirp (Edgetech 512i) surveys 2003-003-FA and 2004-003-FA were acquired with an Edgetech JStar acquisition system with geographic coordinates in Edgetech JSF header. All JSF files were then converted to SEG-Y format.
This process step and all subsequent steps were performed by the same person: David S. Foster.
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David S. Foster
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2271
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Process_Step:
Process_Description:
Unique UTM coordinates and associated shot point number were extracted from each SEG-Y header using Seismic Unix. Output was formatted with an AWK script for all surveys except 2003-003-FA and 2004-003-FA and 2004-006-FA. For these surveys geographic coordinates and associated shot point number were extracted from the SEG-Y header using Seismic Unix. Geographic coordinates were projected into UTM coordinates using Proj 4.0, then formatted for output with an AWK script.
Process_Step:
Process_Description:
Each SEG-Y data file was processed, filtered, and gain enhanced using Seismic Unix and SIOSIES and Promax software.
Process_Step:
Process_Description:
The UTM coordinate pairs and two-way travel time attribute for the horizon data were imported into Landmark Graphics seismic interpretation software SeisWorks R3000 (field activities 1999-045-FA, 2001-005-FA, 2002-012-FA, 2002-013-FA) and SeisVision R2003 (field activities 2003-003-FA and 2004-003-FA), and Kingdom Suite (2001-013-FA, 2002-015-FA, 2003-042-FA, and 2004-005-FA. The data was exported as an ASCII X, Y, and Z (two-way travel time) file.
Process_Step:
Process_Description:
The ASCII data were converted to EarthVision 7.0 (Dynamic Graphics, Inc.) scattered data format with an AWK script.
Process_Step:
Process_Description:
The scattered data were gridded with EarthVision 7.0. The gridded surface of Q50 was edited using the the graphic editor. Large areas of the grid that represented interpolation over NODATA areas were set to null values.
Process_Step:
Process_Description:
A difference grid was created with a 200 meter grid cell spacing. A modified version of the NOAA coastal relief model was converted to a two-way travel time grid using a velocity of 1700 m/s and was used as a base, and the difference was calculated between the base and the two-way travel time grid of depth to Q50. All grid calculations were done with EarthVision 7.0 Formula Processor.
Process_Step:
Process_Description:
The isochron grid was converted to thickness in meters using a velocity of 1700 m/s with EarthVision 7.0 Formula Processor.
Process_Step:
Process_Description:
The thickness of sediment above Q50 was exported from EarthVision 7.0 as an ASCII x, y, and z file.
Process_Step:
Process_Description:
The X, Y, and Z ASCII file was converted to a Arc format grid using xyz2grid.aml in Arc/Info workstation 9.1.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 543
Column_Count: 341
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 18
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -75.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 200.000000
Ordinate_Resolution: 200.000000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David S. Foster
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2271
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Resource_Description: Downloadable Data
Distribution_Liability:
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: WinZip
Format_Version_Number: 9.0
Format_Information_Content:
Zip file containing ESRI GRID format raster, accessory info files and associated metadata for grid of sediment thickness above the Pleistocene surface Q50, inner shelf and back-barrier from Virginia border to Cape Lookout, North Carolina
File_Decompression_Technique: zip archive
Transfer_Size: 1.101
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<https://pubs.usgs.gov/of/2011/1015/data/seismics/interpretation/q50thick.zip>
Network_Resource_Name: <https://pubs.usgs.gov/of/2011/1015/data_catalog.html>
Access_Instructions:
Data are downloadable via the World Wide Web (WWW). This grid was compressed from a folder that contains other grids. Therefore, the accessory "info" folder contains data applicable to each individual grid. If the grids are saved to the same folder structure as outlined in the data catalog, it is safe to overwrite the "info" file, when prompted. All "info" files are identical and contain the required information for each grid within this directory structure.
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20130617
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David S. Foster
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2271
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: dfoster@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.6 on Mon Jun 17 12:30:45 2013