| 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 |
| T3 |
|
Rete Accelerometrica Terna | 2019 | 2599 |
| TA |
|
|
|
|
| TC |
|
Red Sismológica Nacional de Costa Rica | 1973 | 2599 |
| TD |
|
TransAlta Monitoring Network | 2013 | 2599 |
| TF |
|
Tajikistan National Seismic Network | 2022 | 2599 |
| TH |
|
Thuringia Seismic Network, Uni Jena | 1980 | 2599 |
| TJ |
|
Tajikistan National Seismic Network | 2005 | 2599 |
| TK |
|
National Strong Motion Network of Turkey | 1980 | 2599 |
| TL |
|
Armutlu Local Seismic Network | 2006 | 2599 |
| TM |
|
Thai Seismic Monitoring Network | 2008 | 2599 |
| TO |
|
Tectonic Observatory - MASE, VEOX , PeruSE, CCSE | 2004 | 2599 |
| TP |
|
Rete di monitoraggio microsismico installata presso la concessione Gorgoglione | 2018 | 2599 |
| TQ |
|
Taiwan multi-parametric environmental seismic network | 1980 | 2599 |
| TR |
|
Eastern Caribbean Seismograph Network | 1965 | 2599 |
| TT |
|
|
|
2599 |
| TU |
|
National Seismic Network of Turkey (DDA) | 1980 | 2599 |
| TV |
|
INGV Experiments Network | 2008 | 2599 |
| TW |
|
Broadband Array in Taiwan for Seismology |
|
2599 |
| TX |
|
Texas Seismological Network | 2016 | 2599 |
| TZ |
|
Ol Doinyo Lengai, TZ Volcano Monitoring | 2017 | 2599 |
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