Boomer Seismic Reflection Profiles and Shotpoint Navigation Collected on USGS Field Activities 01ASR01, 01ASR02, 02ASR01, and 02ASR02,Miami, Florida, November and December, 2001, and January and February, 2002.

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What does this data set describe?

Title:
Boomer Seismic Reflection Profiles and Shotpoint Navigation Collected on USGS Field Activities 01ASR01, 01ASR02, 02ASR01, and 02ASR02,Miami, Florida, November and December, 2001, and January and February, 2002.
Abstract:
This appendix consists of two-dimensional marine seismic reflection profile data from Miami, Florida, canals. These data were acquired in November and December of 2001 and in January and February of 2002 using a 4.9 m (16 ft) jonboat. The data are available in a variety of formats, including ASCII,HTML, and GIF images. Reference maps and GIF images of the profiles may be viewed with your WWW browser.
For more information on the seismic surveys see http://walrus.wr.usgs.gov/infobank/b/b101fl/html/b-1-01-fl.meta.html , http://walrus.wr.usgs.gov/infobank/b/b201fl/html/b-2-01-fl.meta.html , http://walrus.wr.usgs.gov/infobank/b/b102fl/html/b-1-02-fl.meta.html , and http://walrus.wr.usgs.gov/infobank/b/b202fl/html/b-2-02-fl.meta.html
These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization applications.
Supplemental_Information:
Seismic reflection profiles are acquired by means of an acoustic source (usually generated electronically) and a hydrophone or hydrophone array. Both elements are typically towed in the water behind a survey vessel. The sound source emits a short acoustic pulse, which propagates through the water and sediment columns. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor) and detected at the hydrophone. This process is repeated at intervals ranging between 100 ms and 1s depending on the source type. In this way, a two-dimensional image of the geologic structure beneath the ship track is constructed. Seismic data were stored in SEG-Y format, which is a standard digital format that can be read and manipulated by most seismic-processing software packages. The data presented in this appendix are the processed profiles only. These data are stored in GIF-formatted image files. For Field Activity 01ASR01, the seismic source employed consisted of a boomer transducer towed on a sled at the sea surface providing 100 joules per shot. The reflected energy was received by an SN Technologies NexGen solid core streamer and recorded by PC-based Triton-Elics Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced every 2 meters. Only data received by elements 7 and 8 were summed for line 01b01 and for line 01b02 through shot number 2,819. Afterward, only data received by elements 8 and 9 were summed. The streamer was positioned parallel to the boomer sled and laterally separated from it by approximately 3 m. The sled was towed approximately 5 m behind the GPS antenna. The sample frequency of the data was 12 KHz and the total record length was 100 ms. The fire rate was every 0.5 s, which resulted in a shot spacing of about 0.64 m. For Field Activity 01ASR02, the seismic source employed consisted of a boomer transducer towed on a sled at the sea surface providing 280 joules per shot. The reflected energy was received by an SN Technologies NexGen solid core streamer and recorded by PC-based Triton-Elics Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced every 2 meters. Only data received by elements 8 and 9 where summed for line 01b01 through shot number 8,903. Afterward, data received by element 10 was also summed. The streamer was positioned parallel to the boomer sled and laterally separated from it by approximately 3 m. The sled was towed approximately 5 m behind the GPS antenna. The sample frequency of the data was 24 KHz and the total record length was 100 ms. The fire rate was every 0.5 s, which resulted in a shot spacing of about 0.64 m. For Field Activity 02ASR01, the seismic source employed consisted of a boomer transducer towed on a sled at the sea surface providing 280 joules per shot. The reflected energy was received by an SN Technologies NexGen solid core streamer and recorded by PC-based Triton-Elics Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced every 2 meters. Only data received by elements 8, 9, and 10 were summed for line 02b01 and for line 02b02 through shot number 1,748. Only data received by elements 5, 6, and 7 were summed for line 02b02 between shot numbers 1,750 and 2,828. For the rest of line 02b02 and for all other lines, only data received by elements 4, 5, and 6 were summed. The streamer was positioned parallel to the boomer sled and laterally separated from it by approximately 3 m. The sled was towed approximately 5 m behind the GPS antenna. The sample frequency of the data was 12 KHz for line 02b01 and 24 KHz for all other lines. The total record length was 100 ms. The fire rate was every 0.5 s, which resulted in a shot spacing that ranges from about 0.46 m to 0.64 m. For Field Activity 02ASR02, the seismic source employed consisted of a boomer transducer towed on a sled at the sea surface providing 280 joules per shot. The reflected energy was received by an Innovative Transducer, Inc. (ITI) solid core streamer and recorded by PC-based Triton-Elics Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced about every 0.6 m (2 ft). However, only data received by elements 3 and 4 were summed. The streamer was positioned parallel to the boomer sled and laterally separated from it by approximately 3.5 m. The sled was towed approximately 5.5 m behind the GPS antenna through shot number 8,230 of line 02b01, and approximately 7.5 m behind the antenna for the rest of the line. The sample frequency of the data was 24 KHz and the total record length was 100 ms. The fire rate was every 0.5 s, which resulted in a shot spacing that ranges from about 0.46 m to 0.64 m. Differential GPS navigation was fed to the acquisition system every second by a WAAS/Beacon DGPS receiver. The accuracy of this receiver is to within 5 m. However, the data required some editing. These edited results were used to generate the trackline maps presented here. However, the navigation data has not been corrected to reflect the offset between the source and the GPS antenna. Position fixes for every 500 shots and for the start of line are also provided as an aide for registering of the data after plotting. The trackline maps provided in this appendix are in geographic projection. They were created using ESRI's GIS software ArcView 3.2, exported to Adobe Illustrator for further editing, and saved as GIF images. These GIF images are viewable with your WWW browser. All navigation files are stored as flat ASCII text files.
  1. How might this data set be cited?
    Calderon, Karynna, Dadisman, Shawn V., Kindinger, Jack L., Wiese, Dana S., and Flocks, James G., 2002, Boomer Seismic Reflection Profiles and Shotpoint Navigation Collected on USGS Field Activities 01ASR01, 01ASR02, 02ASR01, and 02ASR02,Miami, Florida, November and December, 2001, and January and February, 2002.: U.S. Geological Survey Open-File Report 02-408, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -80.553848
    East_Bounding_Coordinate: -80.317357
    North_Bounding_Coordinate: 25.973151
    South_Bounding_Coordinate: 25.612488
  3. What does it look like?
    https://pubs.usgs.gov/of/2002/of02-408/HTML/TRKLNMAP.HTM (GIF)
    Trackline map of data collected on USGS Field Activities 01ASR01, 01ASR02, 02ASR01, and 02ASR02 in Miami, Florida, canals during November and December of 2001 and January and February of 2002. This map is in geographic projection. It was created using ESRI GIS software ArcView 3.2, exported to Adobe Illustrator for further editing, and saved for the web as a GIF image. The USGS is not the originator of all the layers used in creating this basemap. For example, the coastline layer was developed by ESRI, and the interstates layer was developed by the Florida Economic and Demographic Research Division of the Joint Management Committee.
    https://pubs.usgs.gov/of/2002/of02-408/HTML/NORTH.HTM (GIF)
    Trackline map of data collected in the northern region of the study area (lines 01ASR01-01b01 - 01b05, 01ASR02-01b01 - 01b08, and 02ASR01-02b04) during USGS Field Activities 01ASR01, 01ASR02, and 02ASR01 in Miami, Florida, canals during November and December of 2001 and January of 2002. This map is in geographic projection. It was created using ESRI GIS software ArcView 3.2, exported to Adobe Illustrator for further editing, and saved for the web as a GIF image.
    https://pubs.usgs.gov/of/2002/of02-408/HTML/SOUTH.HTM (GIF)
    Trackline map of data collected in the southern region of the study area (lines 01ASR01-01b06 - 01b07, 01ASR02-01b09 - 01b11, 02ASR01-02b01 - 02b03 and 02b05 - 02b06, and 02ASR02-02b01) during USGS Field Activities 01ASR01, 01ASR02, 02ASR01, and 02ASR02 in Miami, Florida, canals during November and December of 2001 and January and February of 2002. This map is in geographic projection. It was created using ESRI GIS software ArcView 3.2, exported to Adobe Illustrator for further editing, and saved for the web as a GIF image.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 14-Nov-2001
    Ending_Date: 28-Feb-2002
    Currentness_Reference:
    Data assumed to be constant over time but may change due to geologic processes.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Seismic Reflection Profile Section
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference:
      Horizontal X and Y locations (both Zone 17 UTMs and latitude and longitude) for each shot location are provided in ASCII position files, along with the time the shot was recorded in Greenwich Mean Time (GMT).
    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 0.0000088. Longitudes are given to the nearest 0.0000088. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is WGS 84.
      The ellipsoid used is WGS 1984.
      The semi-major axis of the ellipsoid used is 6378137 m.
      The flattening of the ellipsoid used is 1/298.257.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    Graphic image file:Each profile is available as a GIF image. The trackline maps provided are GIF images that contain hot-links to the seismic profile GIF images. The profiles range in size from 467.2 KB to 5.5 MB.
    Entity_and_Attribute_Detail_Citation: USGS

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karynna Calderon
    • Shawn V. Dadisman
    • Jack L. Kindinger
    • Dana S. Wiese
    • James G. Flocks
  2. Who also contributed to the data set?
    This work was funded by the South Florida Water Management District office in Miami, Florida. We thank Chandra A. Dreher of the USGS in St. Petersburg, FL, for her field support during data collection. We also thank Gina M. Peery of the USGS in St. Petersburg, FL, for her assistance with the web design layout for this appendix, as well as for providing examples of her formal metadata.
  3. To whom should users address questions about the data?
    Jack Kindinger
    U.S. Geological Survey
    Oceanographer
    600 Fourth Street South
    St. Petersburg, FL
    USA

    (727) 803-8747 X3018 (voice)
    jkindinger@usgs.gov

Why was the data set created?

Marine seismic reflection data is used to image and map sedimentary and structural features of the seafloor and subsurface. These data are useful in mapping the extent of the subsurface structure, sediment thickness, and depths to various stratigraphic horizons, as well as in assessing other submarine geologic characteristics and features. These data were collected as part of a larger aquifer storage and recovery (ASR) project done in cooperation with the South Florida Water Management District.

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: 2002 (process 1 of 5)
    Boomer processingRaw SEG-Y data was processed with Seismic Unix software to produce the GIF formatted seismic profiles included in this report.A representative data processing sequence consisted of:1)Bandpass filter: 300-500-2500-3000 Hz2)Automatic gain control3)Postscript display4)Convert Postscripts to GIF format
    Date: 2002 (process 2 of 5)
    Positional (navigation) dataAs the seismic reflection data were acquired, the position of the vessel was continuously determined with the DGPS. Positions were recorded approximately every second and written to the SEG-Y header. The ASCII 500-shot interval navigation files were extracted from the SEG-Y headers using Seismic Unix scripts.
    Date: 2002 (process 3 of 5)
    Editing navigationThe ASCII navigation files were extracted from the SEG-Y headers and edited to remove spurious data points. The data was then processed using PROJ.4 freeware to convert the UTMs to latitude and longitude. The data was also reformatted for use with ESRI's GIS software ArcView 3.2.
    Date: 2002 (process 4 of 5)
    Appendix preparationNo SEG-Y data files are provided on this CD-ROM. The data were displayed as 8-bit gray scale Postscript files using the Seismic Unix 'psimage' algorithm. The Postscript images were then converted to GIF images with ImageMagick. Only the GIF images are presented here.
    Date: 24-Jan-2017 (process 5 of 5)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
  3. What similar or related data should the user be aware of?

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

  1. How well have the observations been checked?
    The validity or accuracy of marine seismic reflection profiles is highly qualitative and depends on equipment and operating condition variables. Visual inspection of the images rendered showed that some of the profiles contain an interference pattern of unknown origin.
  2. How accurate are the geographic locations?
    The position accuracy was determined with a WAAS/Beacon DGPS receiver. The accuracy of this receiver is within 5 m. The DGPS data was fed to a navigation computer running HYPAK software which converted the data to UTMs. The UTM string was then fed to the Delph Seismic Acquisition software and recorded in the SEG-Y headers for each trace.
  3. How accurate are the heights or depths?
    Water level was regulated so that it was 1.524 m (5 ft) above sea level at the time of data acquisition.
  4. Where are the gaps in the data? What is missing?
    These data are collected along tracklines (2D). Therefore, data are inherently incomplete. Geologic details between lines must be inferred. All tracklines were recorded to 100 ms.
  5. How consistent are the relationships among the observations, including topology?
    These data sets are from four field activites with consistent instrument calibrations.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
The U.S. Geological Survey requests to be acknowledged as the originator of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    Rob Wertz
    U.S. Geological Survey
    Manager - Data Management Group
    600 Fourth Street South
    St. Petersburg, FL
    USA

    (727) 803-8747 X3045 (voice)
    rwertz@usgs.gov
    Contact_Instructions:
    Data may be available on-line only by special arrangement with the distributor above.
  2. What's the catalog number I need to order this data set? U.S. Geological Survey Open-File Report 02-325 CD-ROM
  3. What legal disclaimers am I supposed to read?
    This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: All data in this appendix is in either standard GIF or ASCII format. in format GIF, ASCII Size: 69.6
      Media you can order: CD-ROM (format ISO 9660)
      Note: UNIX, LINUX, DOS, MAC
      Data format: The SEG-Y standard format (Barry et al., 1975) consists of the following: a 3,600-byte reel identification header with the first 3,200 bytes consisting of an ASCII header block and a 400-byte binary header block that both include information specific to line and reel number, a trace data block that follows the reel identification header with the first 240 bytes of each trace block consisting of the binary trace identification header, and seismic data samples that follow the trace identification header. in format SEGY data download Size: 15560
      Network links: https://cmgds.marine.usgs.gov/data/01asr01/boomer/
      https://cmgds.marine.usgs.gov/data/01asr02/boomer/
      https://cmgds.marine.usgs.gov/data/02asr01/boomer/
      https://cmgds.marine.usgs.gov/data/02asr02/boomer/
    • Cost to order the data:

      Available from the Denver Open-File Sales Department, prices vary.

    • Special instructions:
      Most open-file reports are available from USGSInformation Services, Box 25286, Federal Center, Denver, CO 80225(telephone: 303-202-4210; email: infoservices@usgs.gov).
  5. What hardware or software do I need in order to use the data set?
    None

Who wrote the metadata?

Dates:
Last modified: 28-Jun-2018
Metadata author:
Karynna Calderon
U.S. Geological Survey
Geographer - Data Management Group
600 Fourth Street South
St. Petersburg, FL
USA

(727) 803-8747 X3143 (voice)
kcalderon@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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