U.S. Geological Survey, 2010, DH_SeismicShot_500: shot point navigation at even 500 shot intervals for EdgeTech SB-512i and SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey offshore of Massachusetts between Duxbury and Hull.: Open-File Report 2009-1072, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.This is part of the following larger work.Online Links:
- <https://pubs.usgs.gov/of/2009/1072/GIS/shapefile/DH_SeismicShot_500.zip>
- <https://pubs.usgs.gov/of/2009/1072/html/appendix1.html>
Barnhardt, Walter A. , Ackerman, Seth D. , Andrews, Brian D. , and Baldwin, Wayne E. , 2010, Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts.: Open-File Report 2009-1072, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.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
Character string of width 50
Range of values | |
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Minimum: | 1 |
Maximum: | 18270 |
Range of values | |
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Minimum: | 349381.99 |
Maximum: | 368175.97 |
Units: | meters |
Resolution: | 0.01 |
Range of values | |
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Minimum: | 4659939.66 |
Maximum: | 4689141.34 |
Units: | meters |
Resolution: | 0.01 |
Range of values | |
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Minimum: | -70.828283 |
Maximum: | -70.595783 |
Units: | Decimal degrees |
Resolution: | 0.000001 |
Range of values | |
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Minimum: | 42.0804 |
Maximum: | 42.339977 |
Units: | Decimal degrees |
Resolution: | 0.000001 |
Character string of width 5
Character string of width 10
Character string of width 15
Character string of width 25
Character string of width 5
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov
This dataset contains shot point navigation at even 500 shot intervals for approximately 1920 km of EdgeTech SB-512i and SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey during two Woods Hole Science Center cruises (06012 and 07001) offshore of Massachusetts between Duxbury and Hull.
Seismic-reflection data acquisition 07001: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-424 towfish (4-24 kHz), which was mounted on a rigid pole on the starboard side of the R/V Rafael of Woods Hole, MA. EdgeTech J-Star and Triton Imaging Inc. SB-Logger seismic acquisition software was used to control the Geo-Star topside unit and digitally log trace data in EdgeTech JSF and SEG-Y Rev. 1 formats, respectively. Data were acquired using a 0.25-s shot rate, a 10-ms pulse length, and a 4 to 16 kHz frequency sweep. Recorded trace lengths were approximately 250 ms. Tracklines were spaced 100 m apart in the shore parallel direction and between 200 m and 2 km apart in the shore perpendicular direction.
Person who carried out this activity:
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov
Person who carried out this activity:
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov
Person who carried out this activity:
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov
Person who carried out this activity:
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov
Person who carried out this activity:
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov
Person who carried out this activity:
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov
Using the Merge function in the Data Management > General toolbox in ArcMap (version 9.2), shapefiles containing even 500 shot interval point positions for field activities 06012 and 07001 were merged together into the single shapefile 'DH_SeismicShot_500.shp'.
Person who carried out this activity:
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov
Stockwell, John, 2008, CWP/SU: Seismic Uni*x: Center for Wave Phenomena - Colorado School of Mines, Golden, CO.Online Links:
Henkart, Paul, 2007, SIOSEIS: Scripps Institution of Oceanography, University of California - San Diego, LaJolla, CA.Online Links:
Michael W. Norris and Alan K. Faichney, 2002, SEGY Rev.1 Data Exchange Format1: Society of Exploration Geophysicists, Tulsa, OK.Online Links:
Barnhardt, Walter A. , Andrews, Brian D. , and Butman, Bradford, 2006, High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts: Open-File Report 2005-1293, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Ackerman, Seth D. , Butman, Bradford, Barnhardt, Walter A. , Danforth, William W. , and Crocker, James M. , 2006, High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts: Open-File Report 2006-1008, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Barnhardt, Walter A. , Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , and Hein, Christopher J. , 2009, High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts: Open-File Report 2007-1373, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
All attributes were checked in a consistent manner.
Field activity 06012: The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 30 - 40 m astern of the R/V Megan T. Miller. Position data were provided by a Global Positioning System (GPS) navigation receiver mounted on the catamaran, and data were transmitted to the acquisition computer on the vessel via a 2.4 GHz radio link. During some portions of the survey, technical difficulties caused the GPS system mounted on the catamaran to malfunction. In these instances Real Time Kinematic (RTK) GPS navigation was obtained from a receiver mounted above the interferometric sonar head (This applies to files l25f2000 through l84f2000 acquired during Julian days 218 through 222). Layback positions, which account for the linear distance between the shipboard RTK-GPS receiver and the towed catamaran vehicle, were calculated trigonometrically during post-processing (see processing step 3). While the vehicle mounted GPS antenna was operational, positional accuracy is assumed to be ± 10 m. While the vehicle mounted GPS was not operational, positional accuracy is assumed to be ± 20 m; increased uncertainty arises because layback calculations do not account for fish motion behind the vessel, which is caused by sea state and vessel speed induced changes in the angle and scope of the tow cable.
Field activity 07001: The SB-424 was mounted on a rigid pole, approximately 1 m below the sea surface on the starboard side of the R/V Rafael. Position data were provided by a RTK-GPS navigation receiver mounted directly above the interferometric sonar head. While the horizontal offset between the SB-424 and the RTK-GPS navigation receiver was not accounted for, this distance was less than 3 m, and the resulting positional accuracy is assumed to be ± 10 m.
Sections where navigation was recorded but no seismic data were logged are not included. Only the subsets of seismic-reflection data collected during field activities 06012 and 07001 that are within the study area between Duxbury and Hull have been included in this spatial dataset. Shot point data for approximately 945 km of additional seismic-reflection profiles collected south of Brant Rock, Massachusetts during these field activities will be published in a subsequent data release focused on Cape Cod Bay.
Any spurious data points were removed during processing.
Are there legal restrictions on access or use of the data?
- 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 source of this information.
508-548-8700 x2226 (voice)
wbaldwin@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: | Shot point navigation at even 500 shot intervals for EdgeTech SB-512i and SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey offshore of Massachusetts between Duxbury and Hull in format SHP (version ArcGIS 9.2) ESRI point shapefile Size: 0.3 Mb |
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Network links: |
<https://pubs.usgs.gov/of/2009/1072/GIS/shapefile/DH_SeismicShot_500.zip> |
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This zip file contains data available in Environmental Systems Research Institute (ESRI) point 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.
508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov