The Incorporated Research Institutions for Seismology/United States Geological Survey (IRIS/USGS) Global Seismographic Network (GSN) is now a fully operational scientific facility routinely used to investigate earth structure and seismicity throughout the world (Butler et al. 2004). Data recorded at GSN stations are rapidly transmitted to international agencies charged with hazard assessment and response as well as to individual scientists eager to study in detail the properties of the most recent earthquake. All who use these recordings depend upon the accuracy of the GSN's metadata provided to them through the IRIS Data Management System ( The IRIS...

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