| 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 |
| O2 |
|
Oklahoma Consolidated Temporary Seismic Networks | 2018 | 2599 |
| OC |
|
Observatorio Sismológico CIGEOBIO CONICET | 2017 | 2599 |
| OE |
|
Austrian Seismic Network | 1987 | 2599 |
| OH |
|
Ohio Seismic Network | 1999 | 2599 |
| OI |
|
Oceania International | 2023 | 2599 |
| OK |
|
Oklahoma Seismic Network | 1978 | 2599 |
| ON |
|
Rede Sismográfica do Sul e do Sudeste | 2011 | 2599 |
| OO |
|
Ocean Observatories Initiative | 2013 | 2599 |
| OQ |
|
Oklahoma Structural and Site Effects Network | 2017 | 2599 |
| OV |
|
Observatorio Vulcanológico y Sismológico de Costa Rica | 1984 | 2599 |
| OW |
|
Ocean Networks Canada Onshore Network | 2018 | 2599 |
| OX |
|
North-East Italy Seismic Network | 2016 | 2599 |
| OY |
|
OGS Mobile LAB | 2019 | 2599 |
| OZ |
|
SRC eqServer | 1976 | 2599 |
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