An Analysis of Earthquake Intensities with Respect to Attenuation, Magnitude, and Rate of Recurrence - Revised Edition

摘要

Earthquake intensity reports collected by various agencies of the U.S. Government from many thousand localities for the years 1928 through 1973 have been encoded and filed on magnetic tape. A method for determining systematically the isoseismal areas and distances is developed and used for the analysis of intensity attenuation. Suites of curves, with corresponding formulas, are developed depicting the attenuation regimes for the Eastern and Western United States and for each of several subregions. A method of calculating recurrence curves is presented, which permits the determination of such a curve by electronic computer/plotter for any point in the conterminous United States. Magnitude versus area of perceptibility relationships are developed and magnitude versus maximum intensity is defined for the various regions.