| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| 4A |
|
Mapping the structure of the Duluth Complex & Animikie Basin | 2022 | 2024 |
| 4A |
|
SP Crater Network | 2016 | 2019 |
| 4A |
|
Darfield RAMP Aftershock Deployment, NZ | 2010 | 2011 |
| 4A |
|
Investigating mechanisms of subglacial hydrology and basal shear stress beneath Whillans Ice Stream using passive seismology | 2008 | 2008 |
| 4B |
|
Seismometer to Investigate Ice and Ocean Structure (SIIOS) Field Experiment: Hiawatha Crater, Greenland | 2022 | 2022 |
| 4E |
|
MARS/Testing of cabled broadband OBS using MARS test facility | 2010 | 2011 |
| 4F |
|
North Texas Earthquake Study: Venus (Johnson County), TX | 2015 | 2025 |
| 4F |
|
Askja 2007 | 2007 | 2011 |
| 4H |
|
Oklahoma State University Seismic Network | 2014 | 2017 |
| 4H |
|
Nabro Urgency Array | 2011 | 2012 |
| 4J |
|
Red sísmica Bioko | 2017 | 2024 |
| 4K |
|
Ruegen Cliff Observatory | 2017 | 2022 |
| 4K |
|
UAE transects across the Semail Ophiolite | 2014 | 2016 |
| 4N |
|
4N - New Jersey 2024 Earthquake Sequence | 2024 | 2025 |
| 4P |
|
Carnegie Washington Backyard Network | 2020 | 2021 |
| 4P |
|
NSF EarthScope USArray Magnetotelluric Transportable and Backbone Arrays | 2006 | 2018 |
| 4S |
|
STAK | 2018 | 2018 |
| 4T |
|
Texas Seismological Network | 2018 | 2099 |
| 4U |
|
São Jorge OBS Network | 2022 | 2023 |
| 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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