In their short note Parsons and Geist (2009) claim that the use of a Gutenberg–Richter relationship is justified for describing the magnitude–frequency relationship of single faults. I will show that their conclusions are biased. The assumption implicitly made by the authors that single faults can produce an uncountable number of earthquakes of different magnitudes directly leads to the consequence that a Gutenberg–Richter relationship describes such a data set (created by simulation) reasonably well.

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