Network-Day Tape

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File Format
Name Network-Day Tape
Released 1980

The Network-Day Tape format, sometimes referred to along with the name of its creator, the Global Digital Seismograph Network, as the GDSN Network-Day Tape format or simply as the GDSN format, is a format for storing seismic station data in use primarily in the United States from somewhere around 1980[1] to 1987, when the SEED format largely supplanted it, in the United States as well as internationally[2]. As the name would suggest, it was meant for storing data on magnetic tape. It may have been designed by a "Madeline Zirbes" at the United States Geological Survey.[3]



  1., e.g. on page 36 (page 39 of the PDF) makes reference to the software being written in late 1980
  2., page 2
  3., last page and first page; the same name is also listed many times as the author of the software to read the format, within comments. It is possible that the format itself was designed by someone else, and that only the major implementation was written by "Madeline Zirbes".
  4., page 31 (35 of PDF)
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