Network-Day Tape

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 (link this) data in use primarily in the United States in use from somewhere around 1980 to 1987, when the SEED format largely supplanted it, in the United States as well as internationally. 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.

Links

 * Network-Delay Tape Software Users Guide (1981): contains Ratfor source to read the format
 * Design Description Day Tape Programs (1980): A manual for software, possibly to read this format