| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| FA |
|
UCLA Seismic Network | 2003 | 2599 |
| FN |
|
Northern Finland Seismological Network | 1980 | 2599 |
| FO |
|
Seismic stations in France not belonging to the academic RESIF networks | 1900 | 2500 |
| FR |
|
|
1962 |
|
| 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 |
| LA |
|
Los Angeles Basin Seismic Network | 1988 | 2999 |
| LB |
|
Leo Brady Network | 1994 |
|
| LC |
|
LSC (Laboratorio Subterraneo de Canfranc) | 1980 | 2599 |
| LD |
|
Lamont-Doherty Cooperative Seismographic Network | 1970 | 2599 |
| LE |
|
LE | 1980 | 2599 |
| LH |
|
Large High-Performance Outdoor Shake Table | 2023 | 2599 |
| LI |
|
Laser Interferometer Gravitational-Wave Experiment | 2000 | 2599 |
| LM |
|
Michigan State University Seismic Network | 2016 | 2599 |
| LO |
|
Observatorio Sismológico Politécnico Loyola | 2012 | 2599 |
| LX |
|
|
|
2599 |
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