| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| 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 |
| T3 |
|
Rete Accelerometrica Terna | 2019 | 2599 |
| TA |
|
USArray Transportable Array | 2003 | 2599 |
| TC |
|
Red Sismológica Nacional de Costa Rica | 1973 | 2599 |
| TD |
|
TransAlta Monitoring Network | 2013 | 2599 |
| TF |
|
Tajikistan National Seismic Network | 2022 | 2599 |
| TJ |
|
Tajikistan National Seismic Network | 2005 | 2599 |
| TM |
|
Thai Seismic Monitoring Network | 2008 | 2599 |
| TO |
|
Tectonic Observatory - MASE, VEOX , PeruSE, CCSE | 2004 | 2599 |
| TP |
|
Rete di monitoraggio microsismico installata presso la concessione Gorgoglione | 2018 | 2599 |
| TR |
|
Eastern Caribbean Seismograph Network | 1965 | 2599 |
| TT |
|
Seismic Network of Tunisia | 2008 | 2599 |
| TW |
|
Broadband Array in Taiwan for Seismology | 1994 | 2599 |
| TX |
|
Texas Seismological Network | 2016 | 2599 |
| TZ |
|
Ol Doinyo Lengai, TZ Volcano Monitoring | 2017 | 2599 |
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