| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| A2 |
|
Armenian Seismological Network | 2021 | 2599 |
| A7 |
|
Angola National Seismic Network | 2018 | 2599 |
| AB |
|
National Seismic Network of Azerbaijan | 2003 | 2599 |
| AC |
|
Albanian Seismological Network | 2002 | 2599 |
| AD |
|
ACROSS Strong Motion Network | 2015 | 2599 |
| AE |
|
Arizona Broadband Seismic Network | 2007 | 2599 |
| AF |
|
AfricaArray | 2004 | 2599 |
| AG |
|
Arkansas Seismic Network | 2009 | 2599 |
| AI |
|
Antarctic Seismographic Argentinean Italian Network | 1992 | 2599 |
| AK |
|
Alaska Regional Network | 1987 | 2599 |
| AL |
|
Alaskan Long Period Array | 1966 | 1979 |
| AM |
|
Raspberry Shake - OSOP | 2016 | 2599 |
| AO |
|
Arkansas Seismic Observatory | 2011 | 2599 |
| AP |
|
APS Free Field Array | 2015 | 2599 |
| AR |
|
Northern Arizona Network | 2000 | 2599 |
| AS |
|
Modified High Gain Long Period Observatory | 1976 | 1993 |
| AT |
|
National Tsunami Warning Center Alaska Seismic Network | 1967 | 2599 |
| AU |
|
Australian National Seismograph Network | 1994 | 2599 |
| AV |
|
Alaska Volcano Observatory | 1988 | 2599 |
| AX |
|
Meteo Aruba | 2012 | 2599 |
| AY |
|
Haitian Seismic Network | 2010 | 2599 |
| AZ |
|
ANZA Regional Network | 1982 | 2599 |
| N4 |
|
Central and Eastern US Network | 2013 | 2599 |
| NA |
|
Caribbean Netherlands Seismic Network | 2006 | 2599 |
| NB |
|
Northeastern Brazil UFRN | 2006 | 2599 |
| NC |
|
USGS Northern California Network | 1966 | 2599 |
| NE |
|
New England Seismic Network | 1994 | 2599 |
| NI |
|
North-East Italy Broadband Network | 2002 | 2599 |
| NJ |
|
Nigerian National Network of Seismographi Stations (NNNSS) | 2009 | 2599 |
| NK |
|
Nepal Kathmandu | 1978 | 2599 |
| NL |
|
Netherlands Seismic and Acoustic Network | 1993 | 2599 |
| NM |
|
Cooperative New Madrid Seismic Network | 1980 | 2599 |
| NN |
|
Nevada Seismic Network | 1971 | 2599 |
| NO |
|
Norwegian Seismic Array Network | 1971 | 2599 |
| NP |
|
United States National Strong-Motion Network | 1931 | 2599 |
| NQ |
|
NetQuakes | 1989 | 2599 |
| NR |
|
NARS | 1983 | 2599 |
| NT |
|
USGS Geomagnetism Program | 1901 | 2599 |
| NU |
|
Nicaraguan Seismic Network | 1975 | 2599 |
| NV |
|
NEPTUNE Canada | 2009 | 2599 |
| NW |
|
Northwestern University Seismic Network | 2011 | 2599 |
| NX |
|
Nanometrics Research Network | 2013 | 2599 |
| NY |
|
Yukon-Northwest Seismic Network | 2013 | 2599 |
| NZ |
|
New Zealand National Seismograph Network | 1988 | 2599 |
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