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GLOSSARY ARPANET - DARPA Computer Network ASL - Albuquerque Seismological Laboratory ASRO - Abbreviated Seismic Research Observatory BCIS - Bureau Centrale Internationale Seismologique (France) DARPA - Defense Advanced Research Projects Agency DOD - Department of Defense EDS - Environmental Data Service (of NOAA) ESSA - Environmental Science Services Administration (succeeded by NOAA in l972) HGLP - High-Gain Long-Period IASPEI - International Association of Seismology and Physics of the Earth's Interior ICSU - International Council of Scientific Unions IDA - International Deployment of Accelerometers IGC - International Geodynamics Commission IGP - International Geodynamics Project IGY - International Geophysical Year ISC - International Seismological Centre (U.K.) IUGG - International Union of Geodesy and Geophysics LASA - Large Aperture Seismic Array Ms - Earthquake Magnitude determined using surface waves Mfr - Earthquake Magnitude determined using body waves NASA - National Aeronautics and Space Administration NEIS - National Earthquake Information Service NOAA - National Oceanic and Atmospheric Administration NORSAR - Norwegian Seismic Array NSF - National Science Foundation OBS - Ocean-bottom seismographs OMB - Office of Management and Budget PDE - Preliminary Determination of Epicenters R - Rayleigh wave SDAC - Seismic Data Analysis Center 63
64 S/N - Signal-to-noise ratio SRO - Seismic Research Observatories T - Period (time domain) USGS - U.S. Geological Survey WDC - World Data Center WWSSN - Worldwide Standardized Seismograph Network (or Worldwide Network of Standardized Seismograph Stations)
