The Advanced National Seismic System (ANSS) is a major national initiative that will serve the needs of the earthquake monitoring, engineering, and research communities as well as national, state, and local governments, emergency response organizations, and the general public. U.S. Geological Survey (USGS) Circular 1188 (a report submitted to Congress in 1999) advocates development of an ANSS of more than 7,000 new digital seismographs. New generations of digital seismic recorders and sensors make it possible to record motions over wide ranges of amplitude and frequency, removing the need for separate and specialized communities based on instrumentation type. Under the ANSS...

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