SAMPLING EVENTS FROM U.S.C. AND G.S. EARTHQUAKE CARDS
Abstract
Two computer programs are presented and illustrated for statistical selection of events from magnetic tapes containing images of U. S. Coast and 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1965
- Accession Number
- AD0618209
Entities
People
- Cheh Pan
- Ralph A. Wiggins
- Stephen M. Simpson Jr.
Organizations
- Massachusetts Institute of Technology