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Expanded Time Scale Playouts of Selected Lunar Seismic Events on 35-mm Microfilm


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1969-11-26 to 1972-08-08


This data set consists of the expanded time scale playouts taken directly from the passive seismic experiment event tapes (data set 69-099C-03A) and not processed in any way (e.g., no filtering, smoothing, signal averaging, etc). The playouts (usually 10 min in length) were generated for all long-period seismic events observed from November 26, 1969 to August 8, 1972, with peak-to-peak signal amplitudes of 2 or more digital units. The annotation format consists of year (in which the playout begins), SKIP X MAG C (where 'SKIP' equals the tape identification number, MAG equals a multiplicative factor which adjusts the signal amplitude of an event for plotting, and 'C' equals the long-period component where X is SPX, Y is LPY, and Z is LPZ), day of the year on which the playout begins, and universal time at which the playout begins. Time ticks are placed at 1-min intervals. These time marks are not corrected for possible clock errors. Notations on the seismograms, such as phase picks (e.g., P or S) or event classification (e.g., A, B, C, M) are not primary data but interpretations of the data and should be recongnized and used as such.

Alternate Names

  • Expanded Scale Playouts


  • Planetary Science: Geology and Geophysics


  • 69-099C-03D

Additional Information



Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Gary V. LathamData ProviderUniversity of Texas, Galveston
Mr. G. P. BarnesGeneral ContactNASA Johnson Space Center
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