Twenty-five years ago, a new global digital seismic network was identified by the National Academies' Committee on Science, Engineering, and Public Policy as one of five research areas in which significant dividends could be expected as a result of incremental federal investment. That recommendation, through coordinated planning and support by scientists, mission agencies, and international partners, spawned the development of the Global Seismographic Network (GSN). The GSN is a joint program of the National Science Foundation (NSF) and the U.S. Geological Survey (USGS). The NSF program is implemented by the Incorporated Research Institutions for Seismology (IRIS) and the University of...

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