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What does this data set describe?

Title:
Geophysical data of field activity I-4-77-NP in Middle America Trench, off Guatemala from 04/23/1977 to 05/23/1977
Abstract:
University of Texas,United States Geological Survey, Menlo Park, California. Chief Scientist: John Ladd. Geophysical data (bathymetry, magnetics) of field activity I-4-77-NP in Middle America Trench, off Guatemala from 04/23/1977 to 05/23/1977, <http://walrus.wr.usgs.gov/infobank/i/i477np/html/i-4-77-np.meta.html>.
Supplemental_Information:

Equipment Used -
bathymetry
magnetics
Publications -
Ladd, J.W., Ibrahim, A.K., McMillen, K.J., Latham, G.V., Worzel, J.L., von Huene, R.E.,
Watkins, J.S., and Moore, J.C., 1978, Structures and tectonics associated with the Middle
America Trench, offshore Guatemala: Geological Society of America Abstracts with Programs,
v. 10, no. 7, p. 439.<BR>
<HR>
Ladd, J.W., Ibrahim, A.K., McMillen, K.J., Latham, Gary V., and von Huene, Roland, 1982,
Interpretation of seismic-reflection data of the Middle America Trench offshore Guatemala, in
Orlofsky, Susan, ed., Initial Reports of the Deep Sea Drilling Project covering Leg 67 of the
cruises of the drilling vessel Glomar Challenger, Manzanillo, Mexico to Puntarenas, Costa Rica:
Initial Reports of the Deep Sea Drilling Project, v. 67, p. 675-689.<BR>
<HR>
International Symposium on the February 4th, 1976, Guatemalan Earthquake
and the Reconstruction Process:<BR><A HREF="<http://igsrglib02.er.usgs.gov/webpac-bin/wgbroker?0104132554040016400+1+search+select++7+4">
<HR>

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/>, 20131029, Geophysical data of field activity I-4-77-NP in Middle America Trench, off Guatemala from 04/23/1977 to 05/23/1977: 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: -92.23440
    East_Bounding_Coordinate: -84.78140
    North_Bounding_Coordinate: 13.85680
    South_Bounding_Coordinate: 9.30700

  3. What does it look like?

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

    Beginning_Date: 23-Apr-1977
    Ending_Date: 23-May-1977
    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: Middle America Trench, off Guatemala
      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:
    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>


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?

    John Ladd (Chief Scientist, University Of Texas); Roland Von Huene (Unspecified, USGS Western Region); Otis Murray (Ship Captain, Ida Green)

  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: 05-Dec-1995 (process 1 of 3)
    Navigation Data
    Converted to time format with year at start.
    
    05/01/86 CLINT DUA0:[DATA.IDAGREEN]I477NP.050;
    DUA0:[DATA.IDAGREEN]TEMP.EXE;
    
    

    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: 20-Jun-2012 (process 2 of 3)
    Magnetics Data
    06/20/2012 carolyn i-4-77-np.220_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/i/i477np/mag/i-4-77-np.200_050
    /bear/programs/edit/automerge/automerge
    
    Converted to time format with year at start.
    
    05/01/86 CLINT DUA0:[DATA.IDAGREEN]I477NP.200;
    DUA0:[DATA.IDAGREEN]TEMP.EXE;
    
    Converted to time format with year at start.
    
    05/01/86 CLINT DUA0:[DATA.IDAGREEN]I477NP.050;
    DUA0:[DATA.IDAGREEN]TEMP.EXE;
    
    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 3 of 3)
    Bathymetry Data
    10/31/1998  /tiger/i/i477np/bath/i-4-77-np.300_050
    /bear/programs/edit/automerge/automerge
    
    Input was...
    Converted to time format with year at start.
    
    05/01/86 CLINT DUA0:[DATA.IDAGREEN]I477NP.300;
    DUA0:[DATA.IDAGREEN]TEMP.EXE;
    
    Input was...
    Converted to time format with year at start.
    
    05/01/86 CLINT DUA0:[DATA.IDAGREEN]I477NP.050;
    DUA0:[DATA.IDAGREEN]TEMP.EXE;
    
    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:
    Ladd, J.W., Ibrahim, A.K., McMillen, K.J., Latham, G.V., Worzel, J.L., von Huene, R.E., Watkins, J.S., and Moore, J.C., 1978, Structures and tectonics associated with the Middle America Trench, offshore Guatemala: Geological Society of America Abstracts with Programs, v. 10, no. 7, p. 439. Ladd, J.W., Ibrahim, A.K., McMillen, K.J., Latham, Gary V., and von Huene, Roland, 1982, Interpretation of seismic-reflection data of the Middle America Trench offshore Guatemala, in Orlofsky, Susan, ed., Initial Reports of the Deep Sea Drilling Project covering Leg 67 of the cruises of the drilling vessel Glomar Challenger, Manzanillo, Mexico to Puntarenas, Costa Rica: Initial Reports of the Deep Sea Drilling Project, v. 67, p. 675-689. International Symposium on the February 4th, 1976, Guatemalan Earthquake and the Reconstruction Process:<BR><A HREF="<http://igsrglib02.er.usgs.gov/webpac-bin/wgbroker?0104132554040016400+1+search+select++7+4">



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 (i-4-77-np.050 [SINS])
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197704232356000    197705181850000
    197705181915000    197705192020000
    197705192100000    197705200320000
    197705200350000    197705201030000
    197705201120000    197705201238000
    197705201300000    197705220805000
    197705220900000    197705220900000
    197705220954000    197705220954000
    197705221126000    197705221148000
    197705221330000    197705221330000
    197705221355000    197705221422000
    197705221448000    197705230530000
    197705230730000    197705230730000
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Magnetics Data (i-4-77-np.220_050)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197704241100000    197704241140000
    197704241200000    197704241205000
    197704241250000    197704241745000
    197704241755000    197704242235000
    197704242300000    197704250330000
    197704250355000    197704272215000
    197704272235000    197704272250000
    197704272305000    197704280440000
    197704280450000    197704280455000
    197704280505000    197704280700000
    197704280725000    197704280730000
    197704281730000    197704292230000
    197704300000000    197704300000000
    197704300010000    197704301020000
    197704301530000    197704301600000
    197704301805000    197704301940000
    197704301950000    197705011245000
    197705031300000    197705031715000
    197705031735000    197705032005000
    197705061455000    197705061510000
    197705061520000    197705062155000
    197705070850000    197705070940000
    197705070946000    197705071635000
    197705071645000    197705071715000
    197705071725000    197705090012000
    197705090020000    197705091750000
    197705091800000    197705100500000
    197705100520000    197705101300000
    197705110240000    197705110825000
    197705111645000    197705111810000
    197705111840000    197705122300000
    197705130000000    197705130010000
    197705130020000    197705130200000
    197705150650000    197705151700000
    197705151850000    197705160100000
    197705160145000    197705160200000
    197705172130000    197705172150000
    197705172200000    197705180725000
    197705180925000    197705181255000
    197705212025000    197705212125000
    197705212335000    197705220300000
    197705220435000    197705220730000
    197705221550000    197705221630000
    197705221705000    197705221740000
    197705222350000    197705230315000
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Bathymetry Data (i-4-77-np.300_050)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    197704240040000    197704250300000
    197704250340000    197704250400000
    197704250435000    197704250710000
    197704250750000    197704251030000
    197704251040000    197704251430000
    197704251436000    197704260815000
    197704260830000    197704261005000
    197704261055000    197704261445000
    197704261500000    197704261600000
    197704261610000    197704261710000
    197704261720000    197704261815000
    197704261830000    197704262210000
    197704262220000    197704262245000
    197704262255000    197704270400000
    197704270530000    197704270940000
    197704270950000    197704280400000
    197704280415000    197704280805000
    197704280815000    197704280840000
    197704280855000    197704281150000
    197704281200000    197704281210000
    197704281230000    197704282110000
    197704282130000    197704290400000
    197704290415000    197704290640000
    197704290700000    197704290800000
    197704290815000    197704290820000
    197704290830000    197704291025000
    197704291035000    197704292225000
    197704292235000    197704292315000
    197704292325000    197704300310000
    197704300320000    197704300400000
    197704300500000    197704300500000
    197704300510000    197704300515000
    197704300535000    197704300535000
    197704300550000    197704301415000
    197704301430000    197704301530000
    197704301540000    197704301740000
    197704301755000    197704301840000
    197704301855000    197704301940000
    197704301950000    197704302350000
    197705010000000    197705011320000
    197705011445000    197705011735000
    197705011745000    197705020840000
    197705021325000    197705021450000
    197705021515000    197705021540000
    197705021605000    197705022330000
    197705022345000    197705022345000
    197705030010000    197705030230000
    197705030240000    197705030400000
    197705030410000    197705030440000
    197705030450000    197705030520000
    197705030530000    197705030645000
    197705031220000    197705031755000
    197705031820000    197705031940000
    197705032000000    197705032040000
    197705061440000    197705070455000
    197705070920000    197705071215000
    197705071230000    197705071230000
    197705071240000    197705071250000
    197705071300000    197705072245000
    197705072255000    197705080735000
    197705080745000    197705081025000
    197705081050000    197705081100000
    197705081110000    197705082000000
    197705082020000    197705082340000
    197705082350000    197705092350000
    197705100000000    197705100430000
    197705100500000    197705101300000
    197705101630000    197705110830000
    197705111605000    197705111840000
    197705111910000    197705120230000
    197705120240000    197705120315000
    197705120900000    197705121210000
    197705121225000    197705121320000
    197705121330000    197705121340000
    197705121355000    197705122300000
    197705130000000    197705130200000
    197705130730000    197705130830000
    197705131700000    197705140555000
    197705140705000    197705141200000
    197705141300000    197705141845000
    197705141915000    197705150540000
    197705150645000    197705150940000
    197705150950000    197705152030000
    197705152115000    197705160200000
    197705172120000    197705172150000
    197705172200000    197705180230000
    197705180240000    197705180720000
    197705180730000    197705181300000
    197705181310000    197705181830000
    197705181850000    197705181850000
    197705181915000    197705182235000
    197705182245000    197705190900000
    197705190910000    197705191035000
    197705191045000    197705191905000
    197705191925000    197705191935000
    197705191945000    197705192020000
    197705192100000    197705192100000
    197705192120000    197705200320000
    197705200350000    197705201030000
    197705201300000    197705210100000
    197705210115000    197705210220000
    197705210235000    197705210520000
    197705210530000    197705210550000
    197705210600000    197705210645000
    197705210655000    197705220020000
    197705220030000    197705220240000
    197705220255000    197705220300000
    197705220330000    197705220755000
    197705221355000    197705221420000
    197705221520000    197705221605000
    197705221620000    197705221620000
    197705221630000    197705230530000
    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 I-4-77-NP data set <http://walrus.wr.usgs.gov/infobank/i/i477np/html/i-4-77-np.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: 0.3
Network links: <http://walrus.wr.usgs.gov/infobank/i/i477np/html/i-4-77-np.nav.html>

Data format: ASCII Size: 0.2
Network links: <http://walrus.wr.usgs.gov/infobank/i/i477np/html/i-4-77-np.mag.html>

Data format: ASCII Size: 0.3
Network links: <http://walrus.wr.usgs.gov/infobank/i/i477np/html/i-4-77-np.bath.html>

  • Cost to order the data: None


  • Who wrote the metadata?

    Dates:
    Last modified: 29-Oct-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 Tue Oct 29 12:20:41 2013