| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| IC |
|
New China Digital Seismograph Network | 1992 | 2599 |
| ID |
|
Project IDA VLP Seismometer Network - UCSD/SIO/IGPP | 1975 | 1995 |
| IE |
|
INL Seismic Monitoring Program | 1972 | 2599 |
| II |
|
Global Seismograph Network - IRIS/IDA | 1986 | 2599 |
| IL |
|
Iranian Long Period Array | 1966 | 1979 |
| IM |
|
International Miscellaneous Stations | 1965 | 2599 |
| IN |
|
National Seismic Network of India | 2000 | 2599 |
| IO |
|
International OGS Network | 2014 | 2599 |
| IP |
|
Instituto Superior Tecnico Broadband Seismic Network | 2002 | 2599 |
| IU |
|
Global Seismograph Network - IRIS/USGS | 1988 | 2599 |
| IV |
|
Italian National Seismic Network | 1988 | 2599 |
| IW |
|
Intermountain West Seismic Network | 2003 | 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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