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National Geophysical Data Center



Data Announcement 1979N-N

The National Geophysical Data Center is making available additional CDP seismic reflection data (lines 7, 8, 11, 12, and 13). These data were collected as part of a program by the U.S. Geological Survey (USGS) to survey the geological framework of the United States coastal areas.

These data were collected by Digicon Geophysical Corporation in 1975 using a 48-channel streamer (3600 m long) and a 27.9-cubic liter airgun array. The processing, which was performed by William C. Patterson (USGS, Denver) on the Phoenix "I", included: demultiplexing and resampling, geometry and common-depth point definition, velocity analysis, noise muting, bandpass filtering, time-variant filtering, time-variant deconvolution, and automatic gain control (AGC) scaling. Sections are available in full scale (2.5 inches/sec) only.

Lines 7, 8, 11, 12, and 13 are available on sepia and blackline.

The following documentation is provided with each line:

          - location maps (sepia or blackline)
          - velocity profiles (microfilm)
          - shot point listings (microfilm)
          - copies of supportive USGS Open File Reports:

   OFR 78-474 - Mid-Atlantic Multichannel Seismic
     Profiles 11, and 12A, B, C, and D,

   OFR 78-685 - Mid-and North Atlantic Multichannel Seismic
     Reflection Profiles 7, 8A, B, and C,
     12E, F, G, H, I, and J, and
     13A, B, C, D, E, F, G, and H.

Shot-point navigation is available on magnetic tape or CD-ROM.

Please contact NGDC for prices.