U.S. Geological Survey Coastal and Marine Geology Program 2013 tab-delimited ASCII text files Menlo Park, CA U.S. Geological Survey http://www.ngdc.noaa.gov/mgg/trk/trackline/farnella/f484wo/mgd77/ Wm. Clinton Steele Carolyn H. Degnan Gary B. Deeter Jean A. Riordan 1980 1.0 Digital Document U.S. Geological Survey Open File Report 167 Menlo Park, CA U.S. Geological Survey http://pubs.usgs.gov/of/1989/0167/report.pdf Single-beam bathymetry and magnetics data along with DGPS navigation data was collected as part of field activity F-4-84-WO in Washington, Oregon from 07/11/1984 to 08/15/1984, http://walrus.wr.usgs.gov/infobank/f/f484wo/html/f-4-84-wo.meta.html The geophysical source was a Knudsen 12 kHz 320B/R echosounder. These data are reformatted from space-delimited ASCII text files located in the Coastal and Marine Geology Program (CMGP) InfoBank field activity catalog at http://walrus.wr.usgs.gov/infobank/f/f484wo/html/f-4-84-wo.bath.html into MGD77T format provided by the NOAA's National Geophysical Data Center(NGDC). The MGD77T format includes a header (documentation) file (.h77t) and a data file (.m77t). More information regarding this format can be found in the publication listed in the Cross_reference section of this metadata file. These data and information are intended for science researchers,students, policy makers, and general public. These data are not to be used for navigation purposes. The data are reformatted into MGD77T standard format for inclusion into NOAA's NGDC geophysical database. From there the data will be made available to GeoMapApp ( http://www.geomapapp.org/ ) and Virtual Ocean ( http://www.virtualocean.org/ ) Earth-browsing software. Access to the data is also provided via the USGS Coastal and Marine Geoscience Data System ( http://cmgds.marine.usgs.gov/ ). The navigation data are digitally collected using a Satellite Integrated Navigation (SINS) system. The system is a space-based satellite navigation maintained by the United States government and is accessible using a satellite receiver. This system provides navigational accuracy of approximately 200 m.The Data Acquistion, Processing, and Storage (DAPS) group performs a number of processing steps to the navigation data once it is collected which can vary by cruise. These steps are outlined within the header information in each individual digital navigation (.05x) space-delimited ASCII data file. The header information rows are indicated by lines beginning with the character "!". There is no information on how the single-beam bathymetry, gravity, and magnetic data were collected. For each data gathering cruise leg, the available data in the following categories are forwarded to NGDC: navigation, gravity, magnetics, bathymetry, and seismic shot points. The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC. 19840711 19840815 ground condition Complete None planned -131.00500 -124.49700 48.45270 42.86480 USGS Metadata Identifier USGS:e707af71-3369-4348-b2b4-3916fe7d90a9 ISO 19115 Topic Category geoscientificinformation oceans None Marine Geology Marine Geophysics Marine Magnetic Field Magnetic Anomalies Bathymetry Water Depth Seafloor Topography Data Categories for Marine Planning distributions bathymetry and elevation Marine Realms Information Bank (MRIB) keywords single-beam echo sounder magnetic field observations marine geophysics USGS Thesaurus single-beam echo sounder bathymetry measurement bathymetry magnetometer measurement marine geophysics Geographic Names Information System (GNIS) Juan de Fuca Ridge North Pacific Ocean Northern Pacific Ocean OR USA WA Washington / Oregon Washington, Oregon Washington-Oregon None. These data are held in the public domain. This information is not intended for navigational purposes.Read and fully comprehend the metadata prior to data use. Uses of thesedata should not violate the spatial resolution of the data. Wherethese data are used in combination with other data of different resolution,the resolution of the combined output will be limited by the lowestresolution 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. GeologicalSurvey. Gregory K. Miller U.S. Geological Survey Physical Scientist mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 803-8747, ext. 3020 gmiller@usgs.gov Monty Hampton (Chief Scientist, USGS Western Region) Hittelman, Allen M., Groman, Robert C., Haworth, Richard T., Holcombe, Troy L., McHendrie, Graig, Smith, Stuart M., and Metzger, Dan R. 2010 Boulder, CO National Geophysical Data Center, National Oceanic and Atmospheric Administration 25 p. http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.pdf The validity or accuracy of bathymetry and navigation data is highly qualitative and depends on equipment and operating condition variables. Data quality is unknown, MGD77T files were formatted from InfoBank files identified as best available version. This data set is from one field activity with unknown instrument calibrations. Processed bathymetric depths were spot checked based on latitude and longitude against the Global Multi-Resolution Topography (GMRT) grid within GeoMapApp to ensure reasonable values. Start and end date/times of data >Navigation Data (f-4-84-wo.072) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198407111802000 198408142330000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (f-4-84-wo.220_072) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198407112256000 198407282006000 >198407290424000 198408071258000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (f-4-84-wo.334_072) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198407112024000 198407282154000 >198407290442000 198408071258000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST Unspecified Unspecified Navigation Data >Converted to time format with year at start. > >03/18/85 KAYE USR$DISK:[DRS.DATA.F4.N]NEW.071; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through FILTER > 19990416 U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) Carolyn H. Degnan Geophysicist mailing and physical address

USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

Santa Cruz CA 95060-5792 USA (831) 460-7452 (831) 427-4748 infobank@octopus.wr.usgs.gov Magnetics Data >07/23/2012 carolyn f-4-84-wo.220_072 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM http://www.ngdc.noaa.gov/IAGA/vmod/igrf11.f >with IGRF-11 coeffiecients integrated into the source code. >/infobank/programs/mag/magred11/magred11.for >Using geodetic coordinate system (Earth shape approximated by spheriod) >with altitude 0.0 km (for sea level). > >Input was... >infobank/f/f484wo/mag/f-4-84-wo.200_072 >time/data style, multi-record, in caps, without tabs >temporal data >reformatted f-4-84-wo.230_072 to isolate observed value for reprocessing > >11/04/2008 carolyn f-4-84-wo.230_072 >/infobank/programs/edit/automerge/automerge > >Converted to time format with year at start. > >03/20/85 CAROLYN USR$DISK:[DRS.DATA.F4.M]F484WO.230; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >data processed elsewhere, given to us by Jim Gardner >reformatted from tape, values originally without decimal points > >Converted to time format with year at start. > >03/18/85 KAYE USR$DISK:[DRS.DATA.F4.N]NEW.071; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through FILTER > >time, lat, long, time(sec) to nearest nav fix, data values 20120723 U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) Carolyn H. Degnan Geophysicist mailing and physical address

USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

Santa Cruz CA 95060-5792 USA (831) 460-7452 (831) 427-4748 infobank@octopus.wr.usgs.gov Bathymetry Data >11/03/2008 jpaz /infobank/f/f484wo/bath/f-4-84-wo.334_072 >/infobank/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/21/87 CAROLYN DRS$DATA:[F484WO.B]F484WO.334; >DUA0:[DRS.BAT]BATRED.EXE;1 >extracted edited field & back calculated travel time from depth >data originally went from 193/2024 to 227/2300, but >220/1300 - 221/1859 goes to F384NC >221/1900 - 222/2259 goes to F284NC >222/2300 - 227/2300 goes to F184SC >data now goes from 193/2024 to 220/1258 > >05/11/87 CAROLYN DRS$DATA:[F484WO]F484WO.333; >DUA0:[DRS.EDIT]MERGEIT.EXE;1 > >05/11/87 CAROLYN DRS$DATA:[F484WO]F484WO.330; >DUA0:[DRS.BAT]BATRED.EXE;1 >back calculating travel times from depths > >05/06/87 EDM DUA0:[DATA.F484WO]F484WO.330; >DUA0:[DRS.EDIT]REFARN.EXE; > >05/06/87 EDM DUA0:[DATA.F484WO]F484WO.330; >DUA0:[DRS.EDIT]REFARN.EXE; > >Input was... >Converted to time format with year at start. > >03/18/85 KAYE USR$DISK:[DRS.DATA.F4.N]NEW.071; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through FILTER > >time, lat, long, time(sec) to nearest nav fix, data values 20081103 U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG) Carolyn H. Degnan Geophysicist mailing and physical address

USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

Santa Cruz CA 95060-5792 USA (831) 460-7452 (831) 427-4748 infobank@octopus.wr.usgs.gov MGD77 file creation - The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC. 20120620 U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Carolyn H. Degnan Geophysicist mailing and physical address

USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive

Santa Cruz CA 95060-5792 USA (831) 460-7452 (831) 427-4748 infobank@octopus.wr.usgs.gov Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. 20170201 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Washington, Oregon Point Point 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.25722210100002 f484wo.m77t MGD77T single-beam bathymetry and magnetics data file for F484WO NOAA's National Geophysical Data Center, See Hittelman and others (2010) Cross_Reference section above for details about the MGD77T format and citation information. SURVEY_ID Survey identifier supplied by the contributing organization NGDC This identifier varies in format and is supplied by the contributing organization TIMEZONE Time-zone correction NGDC In our datasets, no correction was applied. All values equal 0. DATE YYYYMMDD NGDC 19840711 19840807 Year, month, day TIME Time NGDC 0 2359 hours and decimal minutes LAT Latitude World Geodetic System 1984 Geographic Coordinate System 42.86480 48.45270 decimal degrees LON Longitude World Geodetic System 1984 Geographic Coordinate System -131.00500 -124.49700 decimal degrees POS_TYPE Indicates how lat/lon was obtained NGDC 1 3 1 = observed fix, 3 = interpolated fix, nil = unspecified BAT_TTIME Bathymetry, 2-way travel time U.S. Geological Survey 0.346 5.633 seconds CORR_DEPTH Bathymetry, corrected depth U.S. Geological Survey 257.4 4215.7 decimal meters BAT_CPCO Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth NGDC 63 63 01-55 Matthews' Zones with zone , 59 Matthews' Zones, no zone specified, 60 S. Kuwahara Formula, 61 Wilson Formula, 62 Del Grosso Formula, 63 Carter's Tables, 88 Other (see Add. Doc.), 97 Computed using 1500 meters/sec, 98 Unknown if Corrected, 99 Unspecified BAT_TYPCO Bathymetry type code - indicates how the bathymetric value was obtained NGDC 1 3 1 - Observed, 3 - Interpolated (Header Seq. 12), 9 - Unspecified MAG_TOT Magnetics total field - 1st sensor NGDC 51814 55815 gammas MAG_RES Magnetics residual field field NGDC -697 1458 gammas Bathymetry and navigation data for U.S. Geological Survey bathymetry survey F484WO in MGD77T format. Attributes are obtained from MGD77T data files created from the navigation gravity, magnetic, and bathymetry best files. MGD77T is the standard, defined data format used for geophysical data in the National Geophysical Data Center. See Cross_Reference section above for citation details. U.S. Geological Survey mailing and physical address

345 Middlefield Road MS 999

Menlo Park CA 94025 USA (650) 329-5078 (650) 329-5190 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. MGD77t 10 MGD77 tab-delimited ASCII text files. 2.8 http://www.ngdc.noaa.gov/mgg/trk/trackline/farnella/f484wo/mgd77/ Data are available for download on the World Wide Web (WWW). None 20201019 Gregory K. Miller U.S. Geological Survey Physical Scientist mailing and physical address

U.S. Geological Survey, 600 Fourth Street South

St. Petersburg FL 33701 USA (727) 803-8747, ext. 3020 gmiller@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998