| 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 |
| LB |
|
Leo Brady Network | 1994 | 2599 |
| LD |
|
Lamont-Doherty Cooperative Seismographic Network | 1970 | 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 |
|
Instituto Dom Luiz (IDL) - Faculdade de Ciencias Universidade de Lisboa | 2003 | 2599 |
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