| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| H2 |
|
Hawaii 2 Observatory | 1999 | 2003 |
| HG |
|
High-Gain Long-Period Network | 1972 | 1979 |
| HK |
|
Hong Kong Seismograph Network | 2009 | 2599 |
| HL |
|
National Observatory of Athens Seismic Network | 1997 | 2599 |
| HT |
|
Aristotle University of Thessaloniki Seismological Network | 1981 | 2599 |
| HU |
|
Hungarian National Seismological Network | 1992 | 2599 |
| HV |
|
Hawaiian Volcano Observatory Network | 1956 | 2599 |
| HW |
|
Hanford Washington Seismic Network | 1980 | 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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