| 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 |
| WA |
|
West Central Argentina Network | 1958 | 2599 |
| WC |
|
Curacao Seismic Network | 2006 | 2599 |
| WI |
|
West Indies French Seismic Network | 2008 | 2599 |
| WM |
|
Western Mediterranean Seismic Network | 1980 | 2599 |
| 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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