| 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 |
|
2599 |
| OH |
|
Ohio Seismic Network | 1999 | 2599 |
| OI |
|
Oceania International | 2023 | 2599 |
| OK |
|
Oklahoma Seismic Network | 1978 | 2599 |
| ON |
|
|
|
2599 |
| OO |
|
Ocean Observatories Initiative | 2013 | 2599 |
| OQ |
|
Oklahoma Structural and Site Effects Network | 2017 | 2599 |
| OR |
|
Orka Natturunnar | 2016 | 2021 |
| OT |
|
OTRIONS Local Seismic Network, Apulia, Italy | 2013 | 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 |
| WA |
|
West Central Argentina Network | 1958 | 2599 |
| WB |
|
West Bohemia Local Seismic Network (WEBNET) | 1980 | 2599 |
| WC |
|
Curacao Seismic Network |
|
2599 |
| WG |
|
WG_(WA-ARRAY Network) | 2022 | 2599 |
| WI |
|
West Indies French Seismic Network | 2008 |
|
| WM |
|
|
1980 | 2599 |
| WR |
|
California Division of Water Resources | 1964 | 3000 |
| WU |
|
The Southern Ontario Seismic Network | 1991 | 2599 |
| WW |
|
Idaho Seismic Network | 2022 | 2599 |
| WY |
|
Yellowstone National Park Seismograph Network | 1983 | 2599 |
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