The International Seismological Centre (ISC) prepares a global seismicity catalog that is intended to represent a comprehensive summary of hypocenters and phase readings for all sufficiently large earthquakes. There is no firm definition of “sufficiently large”, and in practice the completeness threshold varies from place to place (Willemann, 1999). But the original intention was to relieve seismologists of the need to gather readings from multiple sources and recompute locations as part of individual research projects. At a minimum, therefore, the ISC aims to include all earthquakes in its Bulletin that might be recorded by more than one independently operated network....

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