All earthquake catalogs share three features: the earthquakes cluster in space and time, the small earthquakes greatly outnumber the big ones, and many earthquakes that actually happened are missing. The first two features are natural, but the third, the incompleteness of the catalog, is not: which earthquakes are missed depends both on such natural features as attenuation and noise and on such man‐made ones as where data are collected and how they are converted to a list of earthquakes. For almost all catalogs, the complicated history of the data collection and analysis causes the catalog completeness to vary with time....

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