Hart, Patrick E.Cooper, Alan K.2005GOM98LINE.SHP - Tracklines of Multichannel Seismics Survey Collected During USGS Cruise M1-98-GMWoods Hole Science Center, Woods Hole, MAU.S. Geological Survey, Coastal and Marine Geology ProgramOpen-File Report2005-1071gom98linevector digital dataTwichell, D.C.Cross, V.A.Paskevich, V.F.Hutchinson, D.R.Winters, W.J.Hart, P.E.2005GIS of selected geophysical and core data in the northern Gulf of Mexico continental slope collected by the U.S. Geological Survey1.0http://pubs.usgs.gov/of/2005/10711 DVD-ROMOpen-File Report2005-1071Woods Hole Science Center, Woods Hole, MAU.S. Geological Survey, Coastal and Marine Geology Programhttp://pubs.usgs.gov/of/2005/1071/data/seismic/1998/nav/gom98line.zip1.0Twichell, DavidShapefile showing tracklines of Multichannel Seismics Survey Collected During USGS Cruise M1-98-GM. This cruise was to the Mississippi Canyon region of the Gulf of Mexico, and data were collected along 555 km of tracklines.
During June 1998 and April 1999, the U.S. Geological Survey (USGS) conducted two research cruises in the northern Gulf of Mexico to acquire high-resolution seismic reflection data across the upper and middle continental slope as part of an investigation of the seismic character, distribution, and potential effects of naturally-occurring marine gas hydrates and related free gas within the gas hydrate stability zone. Over 1600 km of two-dimensional multichannel seismic reflection profiles were acquired during these two cruises. The specific objectives of this investigation are (a) to produce high-resolution images of the gas hydrate stability zone; (b) to study the distribution and character of potential seafloor failures and their relationship to known and inferred gas hydrate deposits; (c) to look at systematic variations in subsurface structure in gas hydrate and non-hydrate areas; and (d) to estimate, if possible, the amounts of hydrates present within the gas hydrate stability zone. The multichannel profiles provide high-quality images with approximately 5 meters of vertical resolution and up to 2 km of penetration. This report gives an overview of the acquisition and data processing of the multichannel seismic reflection profiles and provides references and links to reports with more detailed information. Geologic interpretations of these seismic profiles regarding gas hydrate occurrence and distribution within the study areas of this investigation are given in Hart and others (2002).
This GIS overlay is a component of the U.S. Geological Survey, Woods Hole Field Center's, Gulf of Mexico GIS database. The Gulf of Mexico GIS database is intended to organize and display USGS held data and provide on-line (WWW) access to the data and/or metadata.
en1998060119980630ground conditionAs needed-89.941090-88.99771028.65736028.026890-89.941090-88.99771028.02689028.657360Generalmultichannelhydrophonepolyline shapefilenavigationU.S. Geological SurveyUSGSCoastal and Marine Geology ProgramCMGPWoods Hole Science CenterWHSCInformation Archives Field Activity M1-98-GMR/V TOMMY MUNROoceans and estuarieslocationgeoscientificInformationISO 19115 Topic CategoryGeneralGulf of MexicoContinental SlopePublic domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Hart, PatrickU.S. Geological SurveyGeophysicistmailing address
345 Middlefield Road, MS 999
Menlo ParkCA94025USA650-329-5160650-329-5190hart@usgs.govMicrosoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535ShapefileHart, P.E.Cooper, A.K.Twichell, D.C.2002High-resolution multichannel seismic-reflection data acquired in the northern Gulf of Mexico, 1998-991.0Open-File Report02-368Western Coastal and Marine Geology, Menlo Park, CAU.S. Geological Survey, Coastal and Marine Geology Programhttp://geopubs.wr.usgs.gov/open-file/of02-368/Lee, M.Agena, W.Nonehttp://pubs.usgs.gov/of/2005/1071/data/seismic/1998/nav/gom98_line-thumb.gifThumbnail image showing the extent and coverage of the data layer.GIFhttp://pubs.usgs.gov/of/2005/1071/data/seismic/1998/nav/gom98_line.gifGIFImage showing the extent and coverage of the data layer.Alan CooperPatrick HartIngo Pecher1998Cruise Report for a Seismic Investigation of Gas Hydrates in the Mississippi Canyon Region, Northern Gulf of Mexico - Cruise M1-98-GMOpen-File Report98-506Western Coastal and Marine Geology, Menlo Park, CAU.S. Geological Survey, Coastal and Marine Geology Programhttp://geopubs.wr.usgs.gov/open-file/of98-506/David TwichellU.S. Geological SurveyOceanographermailing and physical address
384 Woods Hole Rd.
Woods HoleMA02543-1598USA(508) 548-8700 x2266(508) 457-2310dtwichell@usgs.govDownloadable DataNoneSHP3.3ESRI Shapefile FormatThe SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The DBF file contains the attribute data in dBase format. The PRJ file contains the coordinate system information (optional). The AVL file contains the legend information (optional). The SBN and SBX files contain the spatial index of the geospatial data (optional). The XML file contains the metadata describing the data set <data set name>.shp.xml. An ASCII version of the metadata file. A browse graphic showing the data layer coverage and extent (optional).Zip0.0600.060http://pubs.usgs.gov/of/2005/1071/data/seismic/1998/nav/gom98line.zipData may be retrieved via any WWW browser.DVD-ROM4.75GbytesUDFThese data are available in Environmental Systems Research Institute (ESRI) 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 the importing data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.
Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. 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.2005David C. TwichellU.S. Geological SurveyOceanographermailing address
384 Woods Hole Road
Woods HoleMA02543-1598USA(508) 548-8700 x2266(508) 457-2310FGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998universal timeNoneNoneenhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile2004051714114400FALSE20060130141119002006013014114100{9F5A070B-84EF-4F4A-A19D-A23F48DC25DC}The navigation text file gm98nav.txt was imported form USGS Open-File Report 02-368. This ASCII file was imported to Microsoft Excel and then exported as a comma delimited text file. ArcView 3.3 was uses to add the comma delimited text to the project as a table, and the table then was saved as a shapefile.http://geopubs.wr.usgs.gov/open-file/of02-368/gm98nav.txt20040308gom98shtallg.shpVeeAnn CrossU.S. Geological SurveyMarine Geologistmailing and physical address384 Woods Hole RoadWoods HoleMA02543-1598USA(508) 548-8700 x2251(508) 457-2310vatnipp@usgs.govThe point shapefile (gom99shtallg.shp) was converted to a line file using an Avenue script "navpnts2line.ave" written by VeeAnn Cross.gom99shtallg.shp20040517VeeAnn CrossU.S. Geological SurveyMarine Geologistmailing and physical address384 Woods Hole RoadWoods HoleMA02543-1598USA(508) 548-8700 x2251(508) 457-2310vatnipp@usgs.govgom99lmcs.shpNo additional checks for topological consistency were performed on this data set. No duplicate features are present.Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535gom98line-89.94109-88.9977128.6573628.026891-89.94109-88.9977128.6573628.026891ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\VEECRODTXP\gomgis\data\seismic\1998\nav\gom98line.shpLocal Area Network0.060ShapefileVectorSimplePolylineFALSE41FALSEFALSEString41GCS_North_American_1983Decimal degrees0.0000000.000000North American Datum of 1983Geodetic Reference System 806378137.000000298.257222GCS_North_American_198341gom98lineFeature Class41Shapefile Attribute TableESRIFIDFIDOID400Internal feature number.ESRISequential unique whole numbers that are automatically generated.ShapeShapeGeometry000Feature geometry.ESRICoordinates defining the features.IDIDNumber11sequential numbersuser defined141integer1LINENUMLINENUMString5Number associated with each seismic survey lineUSGSCharacter string representing the survey lineIMAGEIMAGEString60Path to and name of image of seismic profile associated with each survey line.USGSCharacter stringin containing the relative path and name of image of seismic profile that is linked to this track line.LENGTHLENGTHNumber163length of trackline in metersSoftware Computed3282.79555944.282meters.00120060130