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The observation of a universal shape regularity in earthquake frequency-magnitude distributions

SCIENCE APPLICATIONS, INC., PALO ALTO SQUARE, SUITE 200, PALO ALTO, CALIFORNIA 94304
STANFORD LINEAR ACCELERATOR CENTER STANFORD UNIVERSITY, STANFORD, CALIFORNIA 94305

Abstract

On performing a statistical analysis of the data available from both the National Geophysical and Solar Terrestrial Data Center (NGSDC) and other, smaller data bases, a convincing shape regularity was observed in the derived earthquake frequency-magnitude (f-M) distributions. The f-M distributions were obtained from sets of events originating within widely separated regions on the Earth. The regions have geological diversity and areas greater than 6 x 10⁵ km². To within estimated error, the shape of total world data agrees with similar plots of data subsets taken from these eight separate regions of the Earth.

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