| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| A2 |
|
Armenian Seismological Network | 2021 | 2599 |
| A7 |
|
Angola National Seismic Network | 2018 | 2599 |
| AB |
|
National Seismic Network of Azerbaijan | 2003 | 2599 |
| AC |
|
Albanian Seismological Network | 2002 | 2599 |
| AD |
|
ACROSS Strong Motion Network | 2015 | 2599 |
| AE |
|
Arizona Broadband Seismic Network | 2007 | 2599 |
| AF |
|
AfricaArray | 2004 | 2599 |
| AG |
|
Arkansas Seismic Network | 2009 | 2599 |
| AI |
|
Antarctic Seismographic Argentinean Italian Network | 1992 | 2599 |
| AK |
|
Alaska Regional Network | 1987 | 2599 |
| AL |
|
Alaskan Long Period Array | 1966 | 1979 |
| AM |
|
Raspberry Shake - OSOP | 2016 | 2599 |
| AO |
|
Arkansas Seismic Observatory | 2011 | 2599 |
| AP |
|
APS Free Field Array | 2015 | 2599 |
| AR |
|
Northern Arizona Network | 2000 | 2599 |
| AS |
|
Modified High Gain Long Period Observatory | 1976 | 1993 |
| AT |
|
National Tsunami Warning Center Alaska Seismic Network | 1967 | 2599 |
| AU |
|
Australian National Seismograph Network | 1994 | 2599 |
| AV |
|
Alaska Volcano Observatory | 1988 | 2599 |
| AX |
|
Meteo Aruba | 2012 | 2599 |
| AY |
|
Haitian Seismic Network | 2010 | 2599 |
| AZ |
|
ANZA Regional Network | 1982 | 2599 |
| O2 |
|
Oklahoma Consolidated Temporary Seismic Networks | 2018 | 2599 |
| OC |
|
Observatorio Sismológico CIGEOBIO CONICET | 2017 | 2599 |
| OE |
|
Austrian Seismic Network | 1987 | 2599 |
| OH |
|
Ohio Seismic Network | 1999 | 2599 |
| OI |
|
Oceania International | 2023 | 2599 |
| OK |
|
Oklahoma Seismic Network | 1978 | 2599 |
| ON |
|
Rede Sismográfica do Sul e do Sudeste | 2011 | 2599 |
| OO |
|
Ocean Observatories Initiative | 2013 | 2599 |
| OQ |
|
Oklahoma Structural and Site Effects Network | 2017 | 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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