SAMPLING EVENTS FROM USC AND GS EARTHQUAKE CARDS

Two computer programs are presented and illustrated for statistical selection of events from magnetic tapes containing images of U.S. Coast & Geodetic Survey Earthquake Cards. The first program produces an output tape containing cards for all events within a given time range, depth range, and geographical area. The area is specified by arbitrary sets of trapezoids whose parallel sides are latitude lines. Three major seismic regionalizations (Gutenberg and Richter's, Schaeffner's and Texas Instruments') have been card coded into such sets. The second program selects, from the output tape of the first program, all events in given magnitude ranges. It then shuffles the events using the Rand random digits and deals out a selected number of them.

  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Civil Engineering, 77 Massachusetts Avenue
    Cambridge, MA  United States  02139
  • Authors:
    • Simpson Jr, S M
    • Wiggens, R A
    • Pan, C
  • Publication Date: 1965-6

Media Info

  • Features: Figures;
  • Pagination: 70 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00264682
  • Record Type: Publication
  • Report/Paper Numbers: AFCRL-65-463 Final Rpt.
  • Contract Numbers: AF 19(604)7378
  • Files: TRIS
  • Created Date: Feb 11 1975 12:00AM