| 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 |
| S |
|
Seismology at School Program, ETH Zurich | 2008 | 2599 |
| S1 |
|
Australian Seismometers in Schools | 2011 | 2599 |
| S8 |
|
SensorEra Seismic Network | 2023 | 2599 |
| SB |
|
UC Santa Barbara Engineering Seismology Network | 1989 | 2599 |
| SC |
|
New Mexico Tech Seismic Network | 1999 | 2599 |
| SE |
|
Southeastern Appalachian Cooperative Seismic Network | 1999 | 2599 |
| SF |
|
San Andreas Fault Observatory at Depth | 2002 | 2599 |
| SG |
|
International Geodynamics and Earth Tide Service | 1997 | 2599 |
| SH |
|
Shumagin-East Aleutian Network | 1981 | 1991 |
| SK |
|
Slovak National Seismic Network | 2002 | 2599 |
| SL |
|
Seismic Network of the Republic of Slovenia | 1990 | 2599 |
| SN |
|
Southern Great Basin Network | 1980 | 2599 |
| SP |
|
South Carolina Earth Physics Project | 2000 | 2004 |
| SR |
|
Seismic Research Observatory | 1974 | 1993 |
| SS |
|
SINGLE STATION | 1970 | 2599 |
| SV |
|
Servicio Nacional de Estudios Territoriales (SNET), El Salvador | 2004 | 2599 |
| SY |
|
Synthetic Seismograms | 1900 | 2599 |
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