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Published April 1963 | Published
Journal Article Open

Processing of seismic data from an automatic digital recorder


Data from a three-component, long-period seismometer system is recorded in digital form on magnetic tape by a device which has been described by Miller. Preliminary editing and processing is performed to select events of interest from the 24-hour tapes and place them on a library tape that is compatible with a computer. Emphasis is placed on location, correction, and flagging of errors that occur during the recording and editing process. Processing routines developed include: correction for seismometer response, orbital motion functions, energy computation, band pass filtering for mode separation, etc. The dynamic range of the system is 86 db and the response is adequate over the range .02 to 2.0 cps. For the purpose of detailed analysis, digital records from this system are superior to paper records from any of the existing seismographs in use at this laboratory. The main disadvantage of data in this form is the difficulty of inspecting signals by eye in order to make preliminary interpretations.

Additional Information

Copyright © 1963, by the Seismological Society of America. Manuscript received November 10, 1962. Mr. Saul Shragowitz is responsible for much of the programming for the 7090. Mr. John Nordquist has supervised preliminary processing and editing of the source tapes. This research was supported by Grant AF-AFOSR-25-63 of the Air Force Office of Scientific Research as part of the Advanced Research Projects Agency project Vela.

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