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Compressed Time Scale Plots of Lunar Seismic Data (Digitized)


Availability: Data Identified but not Received

Time span: 1969-11-19 to 1976-03-01


This collection consists of digitized microfilm frames of experimenter-produced plots containing 15-sec resonance long-period (LP) X, Y, Z, and 1-sec resonance short-period Z (SPZ) 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 data (320 points for short-period data) and this value is plotted, yielding one value for every 6 seconds of data. Consecutive points are plotted with opposite polarity to yield a line with the appearance of a seismogram. Components are arranged LPX, LPY, LPZ, SPZ, with LPX at the top and SPZ at the bottom. Time ticks are displayed every 10 minutes and each hour (UT) is labeled. The year and day are displayed every 6 hours. The plots contain the values for the Apollo 12, 14, 15, and 16 stations for the times they are in operation, simultaneously displayed on the analog chart. These plots are used to identify seismic events and to determine their start and stop times. The SPX axis for the Apollo 12 station has malfunctioned since deployment and no data have been received.

Data from the Apollo 12, 14, 15, and 16 stations start on 1969-11-19, 1971-02-05, 1971-09-02, and 1972-04-21, respectively, and end on 1976-03-01.

For this digitization effort the NSSDCA scanned the source microfilm reels containing collections PSPG-00029, PSPG-00036, PSPG-00290, and PSPG-00684 at a resolution of 400 dots per inch and output each frame on the film as one TIFF file. The NSSDCA also combined groups of these TIFF images into multipage PDF files to facilitate browsing. Both formats are included in this collection.



NameRoleOriginal AffiliationE-mail
Dr. Gary V. LathamData Provider
Mr. G. P. BarnesGeneral ContactNASA Johnson Space Center
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