| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| 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 |
| UD |
|
UD network | 1980 | 2599 |
| UF |
|
Centro de Investigación de Resiliencia y Riesgos Multi-Amenazas | 2022 | 2599 |
| UH |
|
UH Infrasound Network | 2004 | 2599 |
| UI |
|
North Idaho Seismic Network | 2004 | 2599 |
| UK |
|
UK Schools Seismic Network | 2005 | 2599 |
| UL |
|
USGS Low Frequency Geophysical Data Network | 1974 | 2999 |
| UM |
|
University of Montana Seismic Network | 2017 | 2599 |
| UO |
|
|
|
|
| UP |
|
Swedish National Seismic Network | 1980 | 2599 |
| US |
|
United States National Seismic Network |
|
|
| UU |
|
University of Utah Regional Seismic Network | 1962 | 2599 |
| UW |
|
|
|
|
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