| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| 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 |
| RB |
|
Red Sísmica de Banda Ancha | 2002 | 2599 |
| RC |
|
BYU-Idaho Network | 2001 | 2599 |
| RE |
|
US Bureau of Reclamation Seismic Networks | 1985 | 2599 |
| RI |
|
National Seismic Network of Argentina | 1972 | 2599 |
| RM |
|
Regional Integrated Multi-Hazard Early Warning System | 2008 | 2599 |
| RO |
|
Romanian Seismic Network | 1994 | 2599 |
| RS |
|
Regional Seismic Test Network | 1982 | 1986 |
| RV |
|
Regional Alberta Observatory for Earthquake Studies Network | 2013 | 2599 |
| RW |
|
Rwanda National Seismic Network | 2019 | 2599 |
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