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WORLDWIDE COLLECTION AND EVALUATION OF EARTHQUAKE DATA. FINAL REPORT ON EVALUATION OF 1960 SEISMICITY.
Ray Fisher, Richard G. Baker, Ralph R. Guidroz
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Abstract
Objectives of the study were: Evaluation of worldwide seismicity in 1960 and comparison with that of other years; quantitative comparison of seismic activity in various regions of the world; definition of areas of unusual activity; investigation of the relation between magnitude and earthquake recurrence frequency at a few selected locations; and presentation of a far greater number of magnitude calculations than were available previously for use in capability assessments and in seismicity evaluation. To provide a comprehensive view of seismic activity, several presentation methods are used. Among them are seismicity and epicentral maps, which permit both a region-to-region comparison of activity and a comparison of the 1960 activity with the average annual seismicity. In this study, emphasis was placed on earthquakes in the magnitude range 5.0 to 6.0 (Richter scale) because capabilities of the seismograph stations furnishing data were sufficient for recording all shocks of magnitude 5.0 or greater. Also many shocks of magnitude 3.0 to 5.0 were recorded, and results are given for these events.