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What does this data set describe?

Title:
Geophysical data of field activity L-3-78-EG in Eastern Gulf of Alaska from 06/22/1978 to 07/04/1978
Abstract:
Chief Scientist: Terry Bruns. Geophysical data (airgun, 3dot5khz, minisparker, gravity, gradiometer, sonobuoy, airgunmonitor, magnetics, uniboom, 12khz, Digitrack, dopplersonar, integratednavigation, LoranC, RhoRho, radar, transitsatellite, 24channel) of field activity L-3-78-EG in Eastern Gulf of Alaska from 06/22/1978 to 07/04/1978, <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.meta.html>.
Supplemental_Information:

Equipment Used -
airgun single-channel airgun
3dot5khz 3.5 khz bathymetry
minisparker
gravity
gradiometer
sonobuoy
airgunmonitor single-channel airgun monitor
magnetics magnetometer
uniboom
12khz 12 khz bathymetry
Digitrack
dopplersonar
integratednavigation
LoranC
RhoRho Loran C Rho-Rho
radar
transitsatellite
24channel 24-channel seismic
Publications -
Bruns, Terry R., Mann, Dennis M., and Sliter, Ray W., 1987, Multichannel
seismic-reflection profiles collected in 1978 in the eastern Gulf of Alaska:
U.S. Geological Survey Open-File Report 87-0148, 5 p. 1 sheet.


Bruns, T.R., and Carlson, P.R., 1987, Geology and petroleum potential of the
southeast Alaska continental margin, in D. Scholl, A. Grantz, and J. Vedder,
editors, Geology and resource potential of the continental margin of W. No.
America and adjacent ocean basins: Houston, TX, Circum-Pacific Council for
Energy and Mineral Resources Earth Science Series, v. 6, p. 269-282.

Similar information is available for thousands of other USGS/CMG-related Activities.
If known, available are Activity-specific navigation, gravity, magnetics, bathymetry, seismic, and sampling data; track maps; and equipment information; as well as summary overviews, crew lists, and information about analog materials.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
Primary access to the USGS/CMG Information Bank's digital data, analog data, and metadata is provided through... <http://walrus.wr.usgs.gov/infobank/>
This page accomodates a variety of search approaches (e.g., by platform, by region, by scientist, by equipment type, etc.).
  1. How should this data set be cited?

    U.S. Geological Survey (USGS) <http://www.usgs.gov/>, Coastal and Marine Geology Program (CMGP) <http://marine.usgs.gov/>, 20131101, Geophysical data of field activity L-3-78-EG in Eastern Gulf of Alaska from 06/22/1978 to 07/04/1978: U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -147.13863
    East_Bounding_Coordinate: -133.89804
    North_Bounding_Coordinate: 59.18395
    South_Bounding_Coordinate: 54.65640

  3. What does it look like?

    <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.nav.gif> (GIF)
    Trackline map of L-3-78-EG
    <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.grav.gif> (GIF)
    Gravity data trackline map of L-3-78-EG
    <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.mag.gif> (GIF)
    Magnetics data trackline map of L-3-78-EG
    <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.bath.gif> (GIF)
    Bathymetry data trackline map of L-3-78-EG
    <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.seis.gif> (GIF)
    Seismic shot point data trackline map of L-3-78-EG

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 22-Jun-1978
    Ending_Date: 04-Jul-1978
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      Indirect_Spatial_Reference: Eastern Gulf of Alaska
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values


  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Bathymetry with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/bath.html>
    Entity_and_Attribute_Overview:
    Gravity with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/grav.html>
    Entity_and_Attribute_Overview:
    Magnetics with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/mag.html>
    Entity_and_Attribute_Overview:
    Navigation with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/nav.html>
    Entity_and_Attribute_Overview:
    Seismic Shots with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/seis.html>


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Beckie Larsen (Dafe Curator); Charlie Fitts (Navigator); Dave Aldridge (Watchstander); Dave Wilson (Geologist); Dennis Mann (Chief Watchstander); George Asunsion (Electronics Technician); Glen Barker (Mechanical Technician); Jack Lee (Electronics Technician); Jeff Rupert (Mechanical Technician); Jim Mackrow (Chief Mate); John Dunlavey (Navigator); K. Smith (Chief Engineer); Karen Denman (Watchstander); Ken Bayer (Geophysicist); Larry Maxey (Watchstander, Conservation); Paula Mackrow (Navigator); Phyllis Swenson (Watchstander); Terry Bruns (Chief Scientist); Terry Ruff (Ship Captain)

  3. To whom should users address questions about the data?

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>


Why was the data set created?

These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 27-May-2011 (process 1 of 4)
    Navigation Data
    /infobank/l/l378eg/nav/l-3-78-eg.051
    time/lat/long style, multi-record, in caps, without tabs
    Note: lines2times generated FAKE TIMES for line/shot point records
    
    Input was...
    05/27/2011 carolyn /infobank/l/l378eg/seis/l-3-78-eg.410_051
    /infobank/programs/time/lines2times/lines2times
    time/lat/long style, multi-record, in caps, without tabs
    temporal domain
    Note: lines2times generated FAKE TIMES for line/shot point records
    
    05/23/2011 florence /infobank/l/l378eg/seis/l-3-78-eg.410_fw
    placeholder 410 file formatted for Arc ffid.aml (produces arc/actidSEIS2)
          5/23/2011 fwong@usgs.gov
    string, lat, lon, line, ffid, shot, cdp
    needs to be updated to regular Infobank format
    
           1         2         3         4         5         6         7         8         9
    3456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
    
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Date: 31-Oct-1998 (process 2 of 4)
    Gravity Data
    10/31/1998  /tiger/l/l378eg/grav/l-3-78-eg.160_050
    /bear/programs/edit/automerge/automerge
    
    Input was...
    Converted to time format with year at start.
    
    05/01/86 CLINT DUA0:[DATA.L378EG]L378EG.160;
    DUA0:[DATA.L378EG]TEMP.EXE;
    
    Input was...
    Converted to time format with year at start.
    
    time, lat, long, time(sec) to nearest nav fix, data values
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Date: 21-Jun-2012 (process 3 of 4)
    Magnetics Data
    06/21/2012 carolyn l-3-78-eg.260_050
    
    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...
    10/31/1998  /tiger/l/l378eg/mag/l-3-78-eg.240_050
    /bear/programs/edit/automerge/automerge
    
    Converted to time format with year at start.
    
    01/02/86 CAROLYN DRS$DATA:[L378EG.M]L378EG.240;
    DRB0:[DRS.REFMT]REFORMAT.EXE;5
    from Barb's gravity dump of grvm files
    
    Converted to time format with year at start.
    
    time, lat, long, time(sec) to nearest nav fix, data values
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Date: 31-Oct-1998 (process 4 of 4)
    Bathymetry Data
    10/31/1998  /tiger/l/l378eg/bath/l-3-78-eg.336_050
    /bear/programs/edit/automerge/automerge
    
    Input was...
    Converted to time format with year at start.
    
    12/10/85 BECKIE DISK$USERDISK:[BECKIE.TEMP]L378EG.335;
    DRB0:[DRS.BAT]BATRED.EXE;1
    This file was hand-digetized in 2_way traveltime(secs).
    No Matthews correction.  Sound velocity assumed 1500m/sec.
    
    Input was...
    Converted to time format with year at start.
    
    time, lat, long, time(sec) to nearest nav fix, data values
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

  3. What similar or related data should the user be aware of?

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Unknown, USGS/CMG Information Bank <http://walrus.wr.usgs.gov/infobank/>: U.S. Geological Survey (USGS) <http://www.usgs.gov> Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Menlo Park, CA.

    Online Links:

    Other_Citation_Details:
    Bruns, Terry R., Mann, Dennis M., and Sliter, Ray W., 1987, Multichannel seismic-reflection profiles collected in 1978 in the eastern Gulf of Alaska: U.S. Geological Survey Open-File Report 87-0148, 5 p. 1 sheet.
    Bruns, T.R., and Carlson, P.R., 1987, Geology and petroleum potential of the southeast Alaska continental margin, in D. Scholl, A. Grantz, and J. Vedder, editors, Geology and resource potential of the continental margin of W. No. America and adjacent ocean basins: Houston, TX, Circum-Pacific Council for Energy and Mineral Resources Earth Science Series, v. 6, p. 269-282.



How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Identified as best available version.

  2. How accurate are the geographic locations?

    Unspecified

  3. How accurate are the heights or depths?

    Unspecified

  4. Where are the gaps in the data? What is missing?

    Start and end date/times of data

    Navigation Data (l-3-78-eg.051 [SINS])
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197801010000001    197801010000201
    197801020000001    197801020000118
    197801030000001    197801030000199
    197801040000001    197801040000208
    197801050000001    197801050000178
    197801060000001    197801060000215
    197801070000001    197801070000144
    197801080000001    197801080000137
    197801090000001    197801090000132
    197801100000001    197801100000157
    197801110000001    197801110000161
    197801120000001    197801120000047
    197801130000001    197801130000058
    197801140000001    197801140000117
    197801150000001    197801150000088
    197801160000001    197801160000026
    197801170000001    197801170000107
    197801180000001    197801180000122
    197801190000001    197801190000079
    197801200000001    197801200000087
    197801210000001    197801210000115
    197801220000001    197801220000212
    197801230000001    197801230000088
    197801240000001    197801240000091
    197801250000001    197801250000059
    197801260000001    197801260000303
    197801270000001    197801270000188
    197801280000001    197801280000450
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Gravity Data (l-3-78-eg.160_050)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197806222331480    197806230000000
    197806230016480    197806230101480
    197806230142480    197806230931480
    197806231001480    197806231345480
    197806231351300    197806231629300
    197806231735300    197806240258420
    197806240325420    197806241654480
    197806241800480    197806241900480
    197806242122480    197806250812480
    197806250859120    197806251358120
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Magnetics Data (l-3-78-eg.260_050)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197806240707060    197806260704140
    197806260912130    197806270414430
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Bathymetry Data (l-3-78-eg.336_050)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197806222335000    197806230231000
    197806230310000    197806230600000
    197806230623000    197806241054000
    197806241105000    197806241249000
    197806241346000    197806241952000
    197806242003000    197806242223000
    197806242312000    197806252100000
    197806252112000    197806252237000
    197806252351000    197806260944000
    197806260956000    197806270519000
    197806270531000    197806270531000
    197806270545000    197806270545000
    197806270600000    197806270834000
    197806270845000    197806271031000
    197806271102000    197806280045000
    197806280056000    197806280600000
    197806280625000    197806281843000
    197806281900000    197806281900000
    197806281915000    197807010001000
    197807010016000    197807010400000
    197807010431000    197807030054000
    197807030106000    197807030433000
    197807030448000    197807031518000
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Seismic Shots Data (l-3-78-eg.410_051)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197801010000001    197801010000201
    197801020000001    197801020000118
    197801030000001    197801030000199
    197801040000001    197801040000208
    197801050000001    197801050000178
    197801060000001    197801060000215
    197801070000001    197801070000144
    197801080000001    197801080000137
    197801090000001    197801090000132
    197801100000001    197801100000157
    197801110000001    197801110000161
    197801120000001    197801120000047
    197801130000001    197801130000058
    197801140000001    197801140000117
    197801150000001    197801150000088
    197801160000001    197801160000026
    197801170000001    197801170000107
    197801180000001    197801180000122
    197801190000001    197801190000079
    197801200000001    197801200000087
    197801210000001    197801210000115
    197801220000001    197801220000212
    197801230000001    197801230000088
    197801240000001    197801240000091
    197801250000001    197801250000059
    197801260000001    197801260000303
    197801270000001    197801270000188
    197801280000001    197801280000450
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    

  5. How consistent are the relationships among the observations, including topology?

    Unspecified


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
Physical materials are under controlled on-site access.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
Use_Constraints:
Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Physical materials are under controlled on-site access.
Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
This information is not intended for navigational purposes.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

  2. What's the catalog number I need to order this data set?

    Downloadable Data L-3-78-EG data set <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.meta.html>

  3. What legal disclaimers am I supposed to read?

    Please recognize the U.S. Geological Survey (USGS) as the source of this information.
    Physical materials are under controlled on-site access.
    Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
    This information is not intended for navigational purposes.
    Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

    • Availability in digital form:

Data format: ASCII Size: 0.4
Network links: <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.nav.html>

Data format: ASCII Size: 0.3
Network links: <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.grav.html>

Data format: ASCII Size: 5.2
Network links: <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.mag.html>

Data format: ASCII Size: 0.2
Network links: <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.bath.html>

Data format: ASCII Size: 0.4
Network links: <http://walrus.wr.usgs.gov/infobank/l/l378eg/html/l-3-78-eg.seis.html>

  • Cost to order the data: None


  • Who wrote the metadata?

    Dates:
    Last modified: 01-Nov-2013
    Metadata author:
    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Metadata standard:
    FGDC Content Standards for Digital Geospatial Metadata <http://www.fgdc.gov/> (FGDC-STD-001-1998 <http://www.its.nbs.gov/nbs/meta/meta.html>)


    Generated by mp version 2.9.13 on Fri Nov 1 13:59:59 2013