| 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 |
| H2 |
|
Hawaii 2 Observatory | 1999 | 2003 |
| HA |
|
National and Kapodistrian University of Athens, Seismological Laboratory (NKUA) | 2008 | 2599 |
| HC |
|
Seismological Network of Crete | 2006 | 2599 |
| HE |
|
Finnish National Seismic Network | 1980 | 2599 |
| HF |
|
Swedish Seismic Array Network | 1980 | 2599 |
| HG |
|
High-Gain Long-Period Network | 1972 | 1979 |
| HI |
|
Institute of Engineering Seismology and Earthquake Engineering (ITSAK) Strong Motion Network | 1981 | 2599 |
| HK |
|
Hong Kong Seismograph Network | 2009 | 2599 |
| HL |
|
|
1997 | 2599 |
| HN |
|
Hungarian National Infrasound Network | 2017 | 2599 |
| HP |
|
University of Patras, Seismological Laboratory (PSLNET) | 2000 | 2599 |
| HS |
|
HLNUGNetz | 1980 | 2599 |
| HT |
|
Aristotle University of Thessaloniki Seismological Network | 1981 | 2599 |
| HU |
|
|
1992 | 2599 |
| HV |
|
Hawaiian Volcano Observatory Network | 1956 | 2599 |
| HW |
|
Hanford Washington Seismic Network | 1980 | 2599 |
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