| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| IC |
|
New China Digital Seismograph Network | 1992 | 2599 |
| ID |
|
Project IDA VLP Seismometer Network - UCSD/SIO/IGPP | 1975 | 1995 |
| IE |
|
INL Seismic Monitoring Program | 1972 | 2599 |
| II |
|
Global Seismograph Network - IRIS/IDA | 1986 | 2599 |
| IL |
|
Iranian Long Period Array | 1966 | 1979 |
| IM |
|
International Miscellaneous Stations | 1965 | 2599 |
| IN |
|
National Seismic Network of India | 2000 | 2599 |
| IO |
|
International OGS Network | 2014 | 2599 |
| IP |
|
Instituto Superior Tecnico Broadband Seismic Network | 2002 | 2599 |
| IU |
|
Global Seismograph Network - IRIS/USGS | 1988 | 2599 |
| IV |
|
Italian National Seismic Network | 1988 | 2599 |
| IW |
|
Intermountain West Seismic Network | 2003 | 2599 |
| T3 |
|
Rete Accelerometrica Terna | 2019 | 2599 |
| TA |
|
USArray Transportable Array | 2003 | 2599 |
| TC |
|
Red Sismológica Nacional de Costa Rica | 1973 | 2599 |
| TD |
|
TransAlta Monitoring Network | 2013 | 2599 |
| TF |
|
Tajikistan National Seismic Network | 2022 | 2599 |
| TJ |
|
Tajikistan National Seismic Network | 2005 | 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 |
| TR |
|
Eastern Caribbean Seismograph Network | 1965 | 2599 |
| TT |
|
Seismic Network of Tunisia | 2008 | 2599 |
| TW |
|
Broadband Array in Taiwan for Seismology | 1994 | 2599 |
| TX |
|
Texas Seismological Network | 2016 | 2599 |
| TZ |
|
Ol Doinyo Lengai, TZ Volcano Monitoring | 2017 | 2599 |
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