| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| DE |
|
Nanometrics Research Network | 2013 | 2599 |
| DK |
|
Danish Seismological Network | 1976 | 2599 |
| DR |
|
Centro Nacional de Sismologia (CNS) | 1998 | 2599 |
| DT |
|
Carnegie Analog Broadband Seismograph Network | 1965 | 2003 |
| DU |
|
Seismological Association of Australia | 1995 | 2599 |
| DW |
|
Digital World-Wide Standardized Seismograph Network | 1980 | 1994 |
| 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 |
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