| 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 |
| WA |
|
West Central Argentina Network | 1958 | 2599 |
| WB |
|
West Bohemia Local Seismic Network (WEBNET) | 1980 | 2599 |
| WC |
|
Curacao Seismic Network |
|
2599 |
| WG |
|
WG_(WA-ARRAY Network) | 2022 | 2599 |
| WI |
|
West Indies French Seismic Network | 2008 |
|
| WM |
|
|
1980 | 2599 |
| WR |
|
California Division of Water Resources | 1964 | 3000 |
| WU |
|
The Southern Ontario Seismic Network | 1991 | 2599 |
| WW |
|
Idaho Seismic Network | 2022 | 2599 |
| WY |
|
Yellowstone National Park Seismograph Network | 1983 | 2599 |
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