| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| G |
|
GEOSCOPE - French Global Network of Seismological Broadband Stations | 1982 |
|
| G2 |
|
GEOBEST Baseline Seismic Monitoring Networks for Deep Geothermal Energy Projects in Switzerland. | 2006 | 2599 |
| GB |
|
|
|
2599 |
| GD |
|
Global Positioning System (GPS) Displacement Measurements | 1976 | 2599 |
| GE |
|
|
|
2599 |
| GF |
|
|
|
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 |
|
| GM |
|
|
|
|
| GO |
|
National Seismic Network of Georgia |
|
2599 |
| GQ |
|
GQ Seismic Network | 2018 | 2599 |
| GR |
|
|
1976 | 2599 |
| GS |
|
US Geological Survey Networks |
|
|
| GT |
|
Global Telemetered Seismograph Network (USAF/USGS) | 1993 | 2599 |
| GU |
|
Regional Seismic Network of North Western Italy | 1980 | 2599 |
| GX |
|
GEOFON affiliated stations | 2019 | 2599 |
| GY |
|
Geyokcha Array, Turkmenistan | 1993 | 1994 |
| O2 |
|
Oklahoma Consolidated Temporary Seismic Networks | 2018 | 2599 |
| OC |
|
Observatorio Sismológico CIGEOBIO CONICET | 2017 | 2599 |
| OE |
|
Austrian Seismic Network |
|
2599 |
| OH |
|
Ohio Seismic Network | 1999 | 2599 |
| OI |
|
Oceania International | 2023 | 2599 |
| OK |
|
Oklahoma Seismic Network | 1978 | 2599 |
| ON |
|
|
|
2599 |
| OO |
|
Ocean Observatories Initiative | 2013 | 2599 |
| OQ |
|
Oklahoma Structural and Site Effects Network | 2017 | 2599 |
| OR |
|
Orka Natturunnar | 2016 | 2021 |
| OT |
|
OTRIONS Local Seismic Network, Apulia, Italy | 2013 | 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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