| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| EC |
|
Ecuador Seismic Network | 2002 | 2599 |
| EI |
|
Irish National Seismic Network | 1993 | 2599 |
| EM |
|
Electromagnetic Studies of the Continents | 1996 | 2599 |
| EN |
|
CalEnergy Subnetwork | 2007 | 2599 |
| EO |
|
EON-ROSE | 2018 | 2599 |
| EP |
|
UTEP Seismic Network | 2009 | 2599 |
| ER |
|
Mount Erebus Volcano Observatory Seismic Network | 1981 | 2599 |
| ET |
|
CERI Southern Appalachian Seismic Network | 1982 | 2599 |
| EY |
|
Egyptian national seismological network | 1997 | 2599 |
| 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 |
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