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Identification_Information:

  Citation:

    Citation_Information:

      Originator: Karynna Calderon

      Originator: Shawn V. Dadisman

      Originator: Jack L. Kindinger

      Originator: Dana S. Wiese

      Originator: James G. Flocks

      Publication_Date: 2002

      Title: Archive of Boomer Seismic Reflection Data

               Collected on USGS Field Activities 01ASR01, 01ASR02,

               02ASR01, and 02ASR02,

               Miami, Florida, November 2001 - January 2002.

      Geospatial_Data_Presentation_Form: Seismic Reflection Profile Section

      Series_Information:

        Series_Name: U.S. Geological Survey Open-File Report

        Issue_Identification: 02-408

      Publication_Information:

        Publication_Place: St. Petersburg, FL

        Publisher: U.S. Geological Survey

  Description:

    Abstract:

     This appendix consists of two-dimensional marine seismic reflection profile

     data collected in canals in the Lake Belt Area of Miami, Florida. These

     data were acquired in November and December of 2001 and January and

     February of 2002 using a 4.9-m (16-ft) jonboat. The data are available in

     a variety of formats, including binary, ASCII, HTML, shapefiles, and GIF

     images. Binary data are in Society of Exploration Geophysicists (SEG)

     SEG-Y format and may be downloaded for further processing or display. The

     SEG-Y data files are too large to fit on one CD-ROM, so they have been

     distributed onto two CD-ROMs as explained below. Reference maps and GIF

     images of the profiles may be viewed with your web browser. The GIS

     information provided is compatible with ESRI's GIS software. A

     reconnaissance test line (02ASR02-02b02) was collected northwest of the

     survey area during Field Activity 02ASR02 for possible use in a future

     project. It is archived here for organizational purposes only.

    Purpose:

     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 stratigraphy and in assessing other submarine geologic

     characteristics and features. These data were collected as part of a USGS

     CMGP Aquifer Storage and Recovery and Leaky Coastal Margins project done

     in cooperation with the South Florida Water Management District.

    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 milliseconds and 1 second 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 SEG-Y file format includes a 3200-byte descriptive

     header that contains detailed information regarding the data acquisition

     and processing parameters. All data presented here is stored in SEG-Y,

     Integer, Motorola format. The SEG-Y data files are too large to fit on one

     CD-ROM, so they have been distributed onto two CD-ROMs, with the SEG-Y

     data files for Field Activities 01ASR01 and 01ASR02 on Disc 1 and the

     SEG-Y data files for Field Activities 02ASR01 and 02ASR02 on Disc 2. The

     SEG-Y formatted trace data files have a .TRA extension. Additional

     recording parameters for each seismic data file can also be found in the

     .PAR file associated with each .TRA file. However, the .PAR files and the

     UTM_401_1.pln file are only needed to replay the data with Triton Elics

     Delph Seismic software.

 

     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 meters. The sled was towed approximately 5 meters behind

     the GPS antenna. The sample frequency of the data was 12 kilohertz, and

     the total record length was 100 milliseconds. The fire rate was every 0.5

     seconds, which resulted in a shot spacing of about 0.64 meters.

 

     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 were 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 meters. The sled

     was towed approximately 5 meters behind the GPS antenna. The sample

     frequency of the data was 24 kilohertz, and the total record length was

     100 milliseconds. The fire rate was every 0.5 seconds, which resulted in a

     shot spacing of about 0.64 meters.

    

     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 meters. The sled was towed

     approximately 5 meters behind the GPS antenna. The sample frequency of the

     data was 12 kilohertz for line 02b01 and 24 kilohertz for all other lines.

     The total record length was 100 milliseconds. The fire rate was every 0.5

     seconds, which resulted in a shot spacing that ranges between about 0.46

     and 0.64 meters.

 

     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 meters (2 feet). 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 about 3.5 meters. The sled

     was towed approximately 5.5 meters behind the GPS antenna through shot

     number 8,230 of line 02b01, approximately 7.5 meters behind the antenna

     for the rest of line 02b01, and about 6 meters behind the antenna for line

     02b02. The sample frequency of the data was 24 kilohertz and the total

     record length was 100 milliseconds. The fire rate was every 0.5 seconds,

     which resulted in a shot spacing that ranges between about 0.46 and 0.64

     meters.

    

     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 meters. However, the data required some editing. These edited

     results were used to generate the trackline maps presented here. 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. All navigation files are stored as flat ASCII text files.

     The trackline maps provided in this archive 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.

 

     Included on Disc 2 are the arc project and associated shapefiles used

     to create the trackline maps presented here. The project was created with

     ArcView 3.2 and is compatible with ArcView 3.x (UNIX or Windows)

     and ArcGIS 8.1 (Windows). The shapefiles can be viewed using

     the public domain software ArcExplorer 2.0 (Windows) and 4.0 (Windows,

     UNIX, Linux), which can be downloaded from the ESRI website at

     http://www.esri.com/software/arcexplorer/.

 

     Field Activity Collection System (FACS) logs are available in both html

     and Rich Text format. Scanned GIF images of the original FACS logbooks

     are also provided.

 

     Also included on these CD-ROMs are Seismic Unix (SU) scripts that allow

     the user to strip off navigation fixes from the SEG-Y headers, along with

     a fix for every 500 shots. The seismic data is then converted to SU

     format, filtered, and gained, and GIF-formatted images of the profiles are

     produced. These images can then be displayed using a variety of shareware

     programs such as ImageMagick (UNIX or Linux) or a web browser.

Time_Period_of_Content:

    Time_Period_Information:

      Range_of_Dates/Times:

        Beginning_Date: 20011114

        Ending_Date: 20011115

        Beginning_Date: 20011203

        Ending_Date: 20011205

        Beginning_Date: 20020103

        Ending_Date: 20020105

        Beginning_Date: 20020227

        Ending_Date: 20020228

    Currentness_Reference:

      Data assumed to be constant over time but may change due to geologic

      processes.

  Status:

    Progress: Complete

    Maintenance_and_Update_Frequency: None Planned

  Spatial_Domain:

    Bounding_Coordinates:

      West_Bounding_Coordinate: -80.633509

      East_Bounding_Coordinate:  -80.317357

      North_Bounding_Coordinate:  26.146910

      South_Bounding_Coordinate:  25.612488

  Keywords:

    Theme:

      Theme_Keyword_Thesaurus: none

      Theme_Keyword: marine seismic reflection

      Theme_Keyword: boomer

      Theme_Keyword: 01ASR01

      Theme_Keyword: 01ASR02

      Theme_Keyword: 02ASR01

      Theme_Keyword: 02ASR02

      Theme_Keyword: SEG-Y

    Place:

      Place_Keyword_Thesaurus: none

      Place_Keyword: Miami

      Place_Keyword: Florida

      Place_Keyword: canals

      Place_Keyword: Aquifer Storage and Recovery

  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.

  Point_of_Contact:

    Contact_Information:

      Contact_Person_Primary:

        Contact_Person: Jack Kindinger

        Contact_Organization: U.S. Geological Survey

      Contact_Position: Oceanographer

      Contact_Address:

        Address_Type: mailing address

        Address: 600 Fourth Street South

        City: St. Petersburg

        State_or_Province: FL

        Postal_Code: 33701

        Country: USA

      Contact_Voice_Telephone: (727) 803-8747 X3018

      Contact_Electronic_Mail_Address: jkindinger@usgs.gov

  Browse_Graphic:

    Browse_Graphic_File_Name: CD-ROM/MAPS/basemap.gif

    Browse_Graphic_File_Description:

      Trackline map of data collected for the ASR project 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's 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 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.

    Browse_Graphic_File_Type: GIF

  Browse_Graphic:

    Browse_Graphic_File_Name: CD-ROM/MAPS/north.gif

    Browse_Graphic_File_Description:

      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's GIS software ArcView 3.2, exported to Adobe Illustrator for

      further editing, and saved for the web as a GIF image.

    Browse_Graphic_File_Type: GIF

Browse_Graphic:

    Browse_Graphic_File_Name: CD-ROM/MAPS/south.gif

    Browse_Graphic_File_Description:

      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's GIS software

      ArcView 3.2, exported to Adobe Illustrator for further editing, and saved

      for the web as a GIF image.

    Browse_Graphic_File_Type: GIF

Browse_Graphic:

    Browse_Graphic_File_Name: CD-ROM/MAPS/tstline.gif

    Browse_Graphic_File_Description:

      Trackline map of line 02ASR02-02b02 data collected during USGS Field

      Activity 02ASR02 in Miami, Florida canals during February of 2002. This

      test line was not part of the ASR project. This map is in geographic

      projection. It was created using ESRI's GIS software ArcView 3.2, exported

      to Adobe Illustrator for further editing, and saved for the web as a GIF image.

    Browse_Graphic_File_Type: GIF

Data_Set_Credit:

    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, Florida, for her field support during data collection and

    Gina M. Peery of the USGS in St. Petersburg, Florida, for her assistance

    with the web design layout for this archive, as well as for providing

    examples of her formal metadata. We also thank reviewers Robert B. Halley

    and Charles W. Holmes of the USGS in St. Petersburg, Florida, whose

    comments improved this document.

Native_Data_Set_Environment: SEG-Y

Data_Quality_Information:

  Attribute_Accuracy:

    Attribute_Accuracy_Report:

      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.

  Logical_Consistency_Report: These data sets are from four field activites

    with consistent instrument calibrations.

  Completeness_Report:

    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 milliseconds.

  Positional_Accuracy:

    Horizontal_Positional_Accuracy:

      Horizontal_Positional_Accuracy_Report:

        The position accuracy was determined with a WAAS/Beacon DGPS receiver.

        The accuracy of this receiver is within 5 meters. 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.

    Vertical_Positional_Accuracy:

      Vertical_Positional_Accuracy_Report:

        Water level was regulated so that it was 1.524 meters (5 feet) above

        sea level at the time of data acquisition.

  Lineage:

    Process_Step:

      Process_Description: Boomer processing

        Raw SEG-Y data was processed with Seismic Unix 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 Hz

        2)Automatic gain control

        3)Postscript display

        4)Convert Postscripts to GIF format

      Process_Date: 2002

    Process_Step:

      Process_Description: Positional (navigation) data

        As 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.

      Process_Date: 2002

    Process_Step:

      Process_Description: Editing navigation

        The 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.

      Process_Date: 2002

    Process_Step:

      Process_Description: Open-File preparation

        No processing has been done to the SEG-Y data files provided on these

        CD-ROMs. 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.

      Process_Date: 2002

Spatial_Data_Organization_Information:

  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.

Spatial_Reference_Information:

  Horizontal_Coordinate_System_Definition:

    Geographic:

      Latitude_Resolution: 0.0000088

      Longitude_Resolution: 0.0000088

      Geographic_Coordinate_Units: decimal degrees

    Geodetic_Model:

      Horizontal_Datum_Name: WGS 84

      Ellipsoid_Name: WGS 1984

      Semi-major_Axis: 6378137 m

      Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:

  Overview_Description:

    Entity_and_Attribute_Overview:

      Binary data file:

      Each profile is available as a binary file in Society of Exploration

      Geophysicists (SEG) SEG-Y format. A SEG-Y file consists of 1) a 3200-byte

      file identification record of ASCII-formatted general information, 2) a

      400-byte binary record with information such as sample rate and record

      length specific to the data set, and 3) multiple records, with one

      seismic reflection trace per record. Each trace record is preceded by a

      240-byte trace header containing information such as trace number and

      acquisition day and time specific to each trace. The trace data are

      represented as a time series of unitless 16-bit integer or 32-bit real

      numbers proportional to the reflection coefficient. The SEG-Y file is

      useful only if you have access to specialized software designed to

      process and display seismic reflection data. These SEG-Y files have a

      .TRA extension. These .TRA files range in size from 5.7 MB to 69.2 MB.

    Entity_and_Attribute_Citation:

      Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards

      for digital tape formats: Geophysics, v. 40, n.2, p. 344-352. Also

      available online at:

      http://www.seg.org/publications/tech-stand/index_body.html.

    Entity_and_Attribute_Overview:

      Graphic image file:

      Each profile is available as a GIF image. The trackline maps

      provided are GIF images that contain hotlinks to the seismic profile

      GIF images. The profiles range in size from 467.2 KB to 5.5 MB.

Distribution_Information:

  Distributor:

    Contact_Information:

      Contact_Person_Primary:

        Contact_Person: Rob Wertz

        Contact_Organization: U.S. Geological Survey

      Contact_Position: Manager - Data Management Group

      Contact_Address:

        Address_Type: Mailing address

        Address: 600 Fourth Street South

        City: St. Petersburg

        State_or_Province: FL

        Postal_Code: 33701

        Country: USA

      Contact_Voice_Telephone: (727) 803-8747 X3045

      Contact_Electronic_Mail_Address: rwertz@usgs.gov

      Contact_Instructions:

        Data may be available on-line only by special arrangement with the

        distributor above.

  Resource_Description: U.S. Geological Survey Open-File Report 02-408 CD-ROM

  Distribution_Liability:

    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 these CD-ROMs 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.

  Standard_Order_Process:

    Digital_Form:

      Digital_Transfer_Information:

        Format_Name: SEG-Y, GIF, ASCII

        Format_Information_Content:

          The SEG-Y standard format (Barry et al., 1975) consists of the

          following: a 3600-byte reel identification header with the first

          3200 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.

        File_Decompression_Technique: none

        Transfer_Size: Disc 1: 562.3 MB; Disc 2: 275 MB (2 CD-ROMs)

      Digital_Transfer_Option:

        Offline_Option:

          Offline_Media: CD-ROM

          Recording_Format: ISO 9660

          Compatibility_Information: Unix, Linux, DOS, MAC

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

    Ordering_Instructions: Most open-file reports are available from USGS

       Information Services, Box 25286, Federal Center, Denver, CO 80225

       (telephone: 303-202-4210; email: infoservices@usgs.gov).

  Technical_Prerequisites:

    Use of SEG-Y data requires specialized seismic processing software, such as

    UNIX or Linux based public domain software Seismic Unix (SU) developed by the

    Colorado School of Mines Center for Wave Phenomena, which can be downloaded

    at http://www.cwp.mines.edu/cwpcodes.

Metadata_Reference_Information:

  Metadata_Date: 20021017

  Metadata_Contact:

    Contact_Information:

      Contact_Person_Primary:

        Contact_Person: Karynna Calderon

        Contact_Organization: U.S. Geological Survey

      Contact_Position: Geographer - Data Management Group

      Contact_Address:

        Address_Type: Mailing address

        Address: 600 Fourth Street South

        City: St. Petersburg

        State_or_Province: FL

        Postal_Code: 33701

        Country: USA

      Contact_Voice_Telephone: (727) 803-8747 X3143

      Contact_Electronic_Mail_Address: kcalderon@usgs.gov

  Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata

  Metadata_Standard_Version: FGDC-STD-001-1998


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