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					Marine Geoscience Digital Seismic
         Data System
     Access for education and research

    Field Data Center (LDEO)
Marine Seismic Data Center (UTIG)
                      Scope and Goals
•   Preserve U.S. academic digital seismic reflection data and supporting
    information
•   Help investigators share project data and products
•   Help define and unify seismic-related metadata
•   Promote improvements in comprehensive seismic data discovery




October 2007
               MSDC Home




October 2007
               FSDC Home




October 2007
               Seismic System Components
• Field Seismic Data Center (LDEO)
     – serves digital field data
           • R/V Ewing 57 cruises 1990-2005
           • R/V Langseth (operational January, 2008)
• Marine Seismic Data Center (UTIG)
     – serves digital seismic products
           • stacks, migrations, SCS, UTIG OBS, 3-D, 3.5 kHz, chirp
     – serves field data from 86 cruises (mostly UTIG)
     – serves other types of ‘seismic’ data not otherwise being preserved




October 2007
           Soliciting Digital Seismic Data
      – organize project history, acquisition, processing and publication
        information in FGDC-compliant relational database
      – create trace geographic positions, line-by-line
      – trace locations inserted into SEGY binary data
      – create annotated raster images
                                                     Cruise-organized metadata




October 2007
                      User Interaction
• View and select SEGY, images, navigation
     - map-based search
     - metadata-based search
     - Google Earth files with image links
• External access to metadata
     - xml metadata evaluation with Lamont
     - web map service support (www.ig.utexas.edu:8080/geoserver/wms)
     - GeoMapApp links
• Custom seismic images
• Automated download cart


October 2007
               Custom Images

                           • create custom
                             images with
                             window selection,
                             aspect ratio,
                             filtering and
                             amplitude control.
                           • produces gif and
                             pdf files.




October 2007
          Google Earth with Image Links
   wxww.ig.utexas.edu/sdc/web_services/ReflectionSections_v1.kmz




October 2007
                      Cumulative Contents
                         26,073 SEGY Files

                                   ‘Processed’   Field SEGY
         Year ending     Cruises
                                   SEGY Files        Files
               2001                  1,193         14,697
               2002                  4,798         16,028
               2003                  5,171         16,049
               2004                  6,007         16,148
               2005                  6,966         16,149
               2006       161        8,109         17,068
           Sept 2007      177        8,533         17,540



October 2007
                          User Activity
                         795 Registered Users
                                                                 Total
                     New registered             File
      Year ending                                              Download
                        users                transfers*
                                                                 (GB)
           2001            25+
           2002            65+
           2003             130                1,116              29
           2004             116                1,969              60
           2005             138                8,362             283
           2006             160               11,341             443
        Sept 2007           161               16,275             439
                    *”small” image downloads not monitored
                      +estimated before start of cart system
October 2007
                 Downloads by Data Types
                 37,946 files, 1.224 TB (since July 2004)
                 Type                     Files           Volume (GB)

      Large images+                      6,253                 9
      Trace locations (nav)             16,182                 8
      SEGY:
          Shot                           5,315                515
          Stacks & Migrations            6,684                540
          3-D migrations                   87                  60
          OBS                            1,236                 77
      Total SEGY                        13,363                1,131
                        + not all image downloads monitored

October 2007
               Data Discovery--Alaska




October 2007
               From Jon Childs




October 2007
               Challenges to Comprehensive
                    Seismic Discovery
• Differing institutional priorities
     – just for U.S. seismic data
           • at least 6 institutions with seismic data, plus Antarctic Data Library
           • funding, individual priorities and institutional priorities vary widely,
             and some will never participate
• Differing ‘metadata’ inhibits discovery
     – for example, navigation not specific to each line but instead for the entire
       cruise, whether seismic collected or not
• Differing tools/methods for discovery among centers
           • WMS/WFS large files (slow unless windowed or decimated)
           • Google Earth virtual globe (commercial product limitations)
                – well-known educational and cross-generational browser
                – data center controls information in the placemark, has complete
                  ‘ownership’ control

October 2007
               Digital Marine Seismic Data
• Major U.S. data centers                                  Projects
          USGS (e.g., Lee, WesternGeco, Chevron)            >> 200
          NSF (LDEO & UTIG)                                   ~ 200
          NGDC (plus MMS released)                            ? 100
          SIOSEIS (Ewing, Conrad, Washington)                  ~ 30
          SIOExplorer (Melville, Revelle)                      < 30
          IRIS marine (plus more terrestrial)                  ~ 25
          MMS unreleased digital projects                >>? 3,000
• Other
     – Antarctic seismic library (includes many U.S. not included in the
       above list)                                    ~ 100
     – Other U.S. digital ‘seismics’                  > 120
           • hull mounted chirps, small portable systems chirp, seismic, 3.5kHz
             (lakes and ocean)
October 2007
      Challenges to Seismic Data Centers
• Soliciting contributions post-cruise (‘processed data’)
     – requires connection between contributor-data center and
       contributor-user, including proper acknowledgment of PI
       investments by end-users
          • which is at odds with higher-purpose science tools, which to be
            effective, sever connection to contributors
• Funding model
     – must assume limited 3-5 year life
     – careful monitoring of use activities a necessity for refunding
          • which is at odds with sharing data
          • for example, wholesale incorporation of data into other science tools
            that don’t have monitoring for contributor connections (like GMA,
            LOS, regional data bases)

• But tremendous progress from 1999 and 2001 workshops

October 2007

				
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