| 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 |
| S |
|
|
2008 | 2599 |
| S1 |
|
|
2011 | 2599 |
| S8 |
|
SensorEra Seismic Network | 2023 | 2599 |
| SB |
|
|
|
|
| SC |
|
New Mexico Tech Seismic Network | 1999 | 2599 |
| SE |
|
Southeastern Appalachian Cooperative Seismic Network | 1999 | 2599 |
| SF |
|
|
2002 |
|
| SG |
|
International Geodynamics and Earth Tide Service | 1997 | 2599 |
| SH |
|
Shumagin-East Aleutian Network | 1981 | 1991 |
| SI |
|
Sudtirol Network, Italy | 2006 | 2599 |
| SJ |
|
Serbian Network of Seismic Stations (SJ-Net) | 1980 | 2599 |
| SK |
|
|
|
2599 |
| SL |
|
Seismic Network of the Republic of Slovenia |
|
2599 |
| SN |
|
|
|
|
| SP |
|
South Carolina Earth Physics Project | 2000 | 2004 |
| SR |
|
Seismic Research Observatory | 1974 | 1993 |
| SS |
|
|
|
2599 |
| ST |
|
Trentino Seismic Network, Italy | 1981 | 2599 |
| SV |
|
Servicio Nacional de Estudios Territoriales (SNET), El Salvador | 2004 | 2599 |
| SX |
|
Sachsennetz | 2000 | 2599 |
| SY |
|
Synthetic Seismograms | 1900 | 2599 |
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