Manuscript received 5 April 2002.

Rydelek and Sacks (2003) (R&S) have criticized our mapping of the minimum magnitude of completeness, Mc, in earthquake catalogs (Wiemer and Wyss, 2000). They suggest that their own approach, based on Schuster's (1897) method, is superior. Clearly, tracking down variations in Mc as a function of three-dimensional space and time is a complex task, and every method of attempting to do this has advantages, paid for by shortcomings. We maintain our position that, in the balance of advantages and shortcomings, our method is preferable.

While we...

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