| 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 |
| G |
|
GEOSCOPE - French Global Network of Seismological Broadband Stations | 1982 | 2599 |
| GB |
|
Great Britain Seismograph Network | 1970 | 2599 |
| GD |
|
Global Positioning System (GPS) Displacement Measurements | 1976 | 2599 |
| GE |
|
GEOFON | 1991 | 2599 |
| GF |
|
GONAF | 2006 | 2599 |
| GG |
|
Greenland Ice Sheet Monitoring Network | 2012 | 2599 |
| GH |
|
Ghana Digital Seismic Network | 2010 | 2599 |
| GI |
|
Red Sismologica Nacional- Guatemala | 2001 | 2599 |
| GL |
|
Guadeloupe Seismic and Volcano Observatory Network | 1950 | 2599 |
| GM |
|
U.S. Geological Survey Networks | 2016 | 2599 |
| GO |
|
National Seismic Network of Georgia | 1988 | 2599 |
| GR |
|
German Regional Seismic Network | 1976 | 2599 |
| GS |
|
US Geological Survey Networks | 1980 | 2599 |
| GT |
|
Global Telemetered Seismograph Network (USAF/USGS) | 1993 | 2599 |
| GY |
|
Geyokcha Array, Turkmenistan | 1993 | 1994 |
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