| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| 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 |
| RB |
|
Red Sísmica de Banda Ancha | 2002 | 2599 |
| RC |
|
BYU-Idaho Network | 2001 | 2599 |
| RE |
|
US Bureau of Reclamation Seismic Networks | 1985 | 2599 |
| RI |
|
National Seismic Network of Argentina | 1972 | 2599 |
| RM |
|
Regional Integrated Multi-Hazard Early Warning System | 2008 | 2599 |
| RO |
|
Romanian Seismic Network | 1994 | 2599 |
| RS |
|
Regional Seismic Test Network | 1982 | 1986 |
| RV |
|
Regional Alberta Observatory for Earthquake Studies Network | 2013 | 2599 |
| RW |
|
Rwanda National Seismic Network | 2019 | 2599 |
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