The IRIS/USGS Global Seismographic Network (Butler et al., 2004) is used to investigate earth structure at multiple scales, to capture information about massive earthquakes impossible to obtain at regional scales, and to characterize seismicity in regions of the world where instrument coverage is poor. A key design goal of the GSN, to place high performance instruments at 2,000 km spacing around the planet, has largely been achieved except for portions of the ocean basins. Several agencies, including the USGS National Earthquake Information Center, the NOAA Tsunami Warning Centers, and the United Nations Comprehensive Test Ban Treaty Organization,...

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