The geophysical mapping utilized a suite of high-resolution instrumentation to map the surficial sediment distribution, depth and sub-surface geology: dual-frequency 100/500 KHz sidescan-sonar system, 234-KHz interferometric sonar, and 500 Hz -12 KHz chirp sub-bottom profiler. The survey was conducted aboard the M/V Megan Miller August 9-13, 2007. The study area covers 35 square kilometers from about 0.2 km to 5-km offshore of the south shore of Martha's Vineyard, and ranges in depth from ~ 5 to 20 meters.
U.S. Geological Survey, 2009, SEISMIC_TRKNAV.SHP: Trackline navigation of chirp seismic-reflection data collected of the southern shore of Martha's Vineyard, MA, 2007 (ESRI POLYLINE SHAPEFILE).: Open-File Report 2008-1288, U.S. Geological Survey, Woods Hole, MA.This is part of the following larger work.Online Links:
- <https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Tracklines/seismic_trknav.zip>
- <https://pubs.usgs.gov/of/2008/1288/html/gis.html>
Denny, J.F., Danforth, W.W., Foster, D.S., and Sherwood, C.R., 2009, Geophysical Data Collected off the South Shore of Martha's Vineyard, Massachusetts: Open-File Report 2008-1288, U.S. Geological Survey, Woods Hole.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
Naming convention for the JSF format seismic data. Format: L1F1_000, where L=Line, 1= Line number, f=file, 1=file number, and '_000' is an optional JSF line incrementor.
Character Set
Frequency range used during seismic data acquisition.
Value | Definition |
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250 ms | shot rate in milliseconds |
Directory structure pointing to a JPEG image of a specific seismic line.
Value | Definition |
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07011 | USGS Cruise Identification Number, where the first two digiits represent the calendar year and the last three digits represent the cruise number |
Range of values | |
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Minimum: | 0.684543 |
Maximum: | 7.08901 |
Units: | Kilometers |
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
This dataset contains trackline navigation for approximately 680 km of EdgeTech SB-512i chirp seismic-reflection data collected by the U.S. Geological Survey during Woods Hole Science Center cruise 07011 off the southern shore of Martha's Vineyard, 2007. These lines, in conjunction with the shot-point navigation can be used to correlate the seismic-reflection profiles with other data in the GIS.
.
Person who carried out this activity:
(508) 548-8700x2271 (voice)
5084572310 (FAX)
dfoster@usgs.gov
Person who carried out this activity:
(508) 548-8700x2271 (voice)
5084572310 (FAX)
dfoster@usgs.gov
Person who carried out this activity:
(508) 548-8700x2271 (voice)
5084572310 (FAX)
dfoster@usgs.gov
ArcGIS 9.2
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Stockwell, John, 2007, Seismic Un*x: Center for Wave Phenomena - Colorado School of Mines, Golden, CO.Online Links:
Norris, Michael W., and Faichney, Alan K., 2002, SEGY Rev.1 Data exchange Format1: Society of Exploration Geophysicists, Tulsa, OK.Online Links:
All attributes were evaluated during processing as standard quality control to ensure attributes contain accurate and relevant information and values.
The EdgeTech SB-0512i was towed approximately 5 meters astern and approximately 1.5 meters below the sea surface. A GPS navigation receiver was mounted on the seismic sled to provide seismic navigation. GPS positions were sent, via radio modem, to a receiver positioned on the aft roof of the acquisition van aboard the R/V Megan Miller. GPS positions were sent directly to the EdgeTech J-Star seismic acquisition software. The horizontal accuracy of GPS is assumed to be ± 10 m (<http://www.navcen.uscg.gov/>).
Trackline navigation for all seismic data were used to generate this shapefile. Line 92 was saved as l91f1_001 during acquisition.
Seismic trackline navigation was generated from unique shot navigation for the seismic system. The unique shot navigation data were evaluated during processing for spurious points; all spurious points were removed prior to generating the trackline navigation.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- The U.S. Geological Survey asks to be referenced as the originator of the dataset in any future publications.
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Downloadable Data
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.
Data format: | This WinZip file contains a shapefile of 512i seismic-reflection profile trackline navigation and associated metadata. in format WinZip (version 9.0) Size: 2 MB |
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Network links: |
<https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Tracklines/seismic_trknav.zip> |
Digital copies of the chirp seismic data may also be obtained in the SEG-Y Rev. 1 standard format upon request. The data would be packaged on DVD, and contain the chirp-processed, envelope traces.
This zip file contains data available in Environmental Systems Research Institute (ESRI) polyline shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov