| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| B6 |
|
Bransfield Strait Seismic Network | 2008 | 2599 |
| BC |
|
Red Sísmica del Noroeste de México | 1980 | 2599 |
| BE |
|
Belgian Seismic Network | 1985 | 2599 |
| BF |
|
Black Forest Observatory | 1979 | 1995 |
| BI |
|
University of Dhaka Seismographic Network | 2008 | 2599 |
| BK |
|
Berkeley Digital Seismograph Network | 1980 | 2599 |
| BL |
|
Brazilian Lithospheric Seismic Project | 1988 | 2599 |
| BN |
|
UK-Net, Blacknest Array | 1960 | 2599 |
| BV |
|
Bolvian Seismic Network | 1913 | 2599 |
| BX |
|
Botswana Seismological Network | 2001 | 2599 |
| 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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