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Compressed Time Scale Plots of Lunar Seismic Data on 35-mm Microfilm


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

Time span: 1972-04-21 to 1976-03-01


This data set consists of 35- and 16-mm microfilm of experimenter produced plots containing long period X, Y, and Z and short period Z (ground movement) seismic values. To enhance the signal-to-noise ratio for higher frequency events, a difference method was employed in reduction of the data. The absolute value of the difference between consecutive data points is summed over 40 points for long period (1-sec resonance) data, 320 points for short period (5-sec resonance) data and this value is plotted yielding one value for each 6 sec of data. Consecutive digitized points are plotted with opposite polarity to yield a line with the appearance of a seismogram. Components are arranged LPX, LPY, LPZ, SPZ with long period X at the top and short period Z at the bottom. Time ticks are displayed every 10 minutes and each hour (ut) is labeled. The year and day are displayed every 6 hr. The plots also contain the values for the Apollo 12, 14, and 14 stations simultaneously displayed on the analog chart. These plots are used to identify seismic events and to determine their start and stop time.

Digital images (scans) of the entire contents of the microfilm are available as data collection PSPG-00939.

Alternate Names

  • Compressed Scale Playouts


  • Planetary Science: Geology and Geophysics


  • 72-031C-01D

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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