Manuscript received 24 January 2002.

Wiemer and Wyss [2000] (WW) have analyzed earthquake data from Japan in order to determined the magnitude level (Mc) at which seismic catalogs are complete. Regional and local maps that accurately show the spatial variation of Mc are important because they provide helpful guidance in planning for the future deployment of seismic stations. This comment is intended to point out several problems with WW's method of determining Mc and to demonstrate that ignoring temporal variations in seismicity can result in erroneous completeness maps.

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The fundamental assumption made by...

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