| 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 |
|
2599 |
| AC |
|
|
2002 | 2599 |
| AD |
|
|
|
2599 |
| AE |
|
Arizona Broadband Seismic Network | 2007 | 2599 |
| AF |
|
|
|
2599 |
| AG |
|
Arkansas Seismic Network | 2009 | 2599 |
| AI |
|
|
|
2599 |
| AK |
|
Alaska Regional Network | 1987 | 2599 |
| AL |
|
Alaskan Long Period Array | 1966 | 1979 |
| AM |
|
|
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 |
|
|
|
2599 |
| AV |
|
Alaska Volcano Observatory | 1988 | 2599 |
| AW |
|
AWI Network Antarctica (AWI-Net) | 1980 | 2599 |
| AX |
|
Meteo Aruba | 2012 | 2599 |
| AY |
|
|
|
2599 |
| AZ |
|
|
1982 |
|
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