| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| H2 |
|
Hawaii 2 Observatory | 1999 | 2003 |
| HA |
|
National and Kapodistrian University of Athens, Seismological Laboratory (NKUA) | 2008 | 2599 |
| HC |
|
Seismological Network of Crete | 2006 | 2599 |
| HE |
|
Finnish National Seismic Network | 1980 | 2599 |
| HF |
|
Swedish Seismic Array Network | 1980 | 2599 |
| HG |
|
High-Gain Long-Period Network | 1972 | 1979 |
| HI |
|
Institute of Engineering Seismology and Earthquake Engineering (ITSAK) Strong Motion Network | 1981 | 2599 |
| HK |
|
Hong Kong Seismograph Network | 2009 | 2599 |
| HL |
|
|
1997 | 2599 |
| HN |
|
Hungarian National Infrasound Network | 2017 | 2599 |
| HP |
|
University of Patras, Seismological Laboratory (PSLNET) | 2000 | 2599 |
| HS |
|
HLNUGNetz | 1980 | 2599 |
| HT |
|
Aristotle University of Thessaloniki Seismological Network | 1981 | 2599 |
| HU |
|
|
1992 | 2599 |
| HV |
|
Hawaiian Volcano Observatory Network | 1956 | 2599 |
| HW |
|
Hanford Washington Seismic Network | 1980 | 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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