| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| B6 |
|
Bransfield Strait Seismic Network | 2008 | 2599 |
| BA |
|
Universita della Basilicata Seismic Network | 2005 | 2599 |
| BC |
|
|
|
|
| BE |
|
|
|
2599 |
| BF |
|
Black Forest Observatory | 1979 | 1995 |
| BG |
|
Berkeley Geysers Network | 2002 | 2999 |
| BI |
|
University of Dhaka Seismographic Network | 2008 | 2599 |
| BK |
|
|
|
|
| BL |
|
|
|
2599 |
| BN |
|
UK-Net, Blacknest Array |
|
2599 |
| BP |
|
Parkfield High Resolution Seismic Network (HRSN) | 2000 | 2999 |
| BQ |
|
Bensberg Earthquake Network, University of Cologne | 2016 | 2599 |
| BR |
|
UnB | 1980 | 2599 |
| BS |
|
Bulgarian Seismic Network | 1980 | 2599 |
| BV |
|
Bolvian Seismic Network | 1913 | 2599 |
| BW |
|
BayernNetz | 1980 | 2599 |
| BX |
|
Botswana Seismological Network | 2001 | 2599 |
| O2 |
|
Oklahoma Consolidated Temporary Seismic Networks | 2018 | 2599 |
| OC |
|
Observatorio Sismológico CIGEOBIO CONICET | 2017 | 2599 |
| OE |
|
Austrian Seismic Network |
|
2599 |
| OH |
|
Ohio Seismic Network | 1999 | 2599 |
| OI |
|
Oceania International | 2023 | 2599 |
| OK |
|
Oklahoma Seismic Network | 1978 | 2599 |
| ON |
|
|
|
2599 |
| OO |
|
Ocean Observatories Initiative | 2013 | 2599 |
| OQ |
|
Oklahoma Structural and Site Effects Network | 2017 | 2599 |
| OR |
|
Orka Natturunnar | 2016 | 2021 |
| OT |
|
OTRIONS Local Seismic Network, Apulia, Italy | 2013 | 2599 |
| OV |
|
Observatorio Vulcanológico y Sismológico de Costa Rica | 1984 | 2599 |
| OW |
|
Ocean Networks Canada Onshore Network | 2018 | 2599 |
| OX |
|
North-East Italy Seismic Network | 2016 | 2599 |
| OY |
|
OGS Mobile LAB | 2019 | 2599 |
| OZ |
|
SRC eqServer | 1976 | 2599 |
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