| 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 |
| MB |
|
Montana Regional Seismic Network | 1996 | 2599 |
| MC |
|
Montserrat CALIPSO Borehole Network | 2008 | 2599 |
| MG |
|
Permanent Seismic Network of Queretaro State, Mexico | 2003 | 2599 |
| MH |
|
Mobile Earthquake Recording in Marine Areas by Independent Divers | 2003 | 2599 |
| MI |
|
USGS Northern Mariana Islands Network | 2000 | 2599 |
| MM |
|
Myanmar National Seismic Network | 2016 | 2599 |
| MN |
|
Mediterranean Very Broadband Seismographic Network | 1988 | 2599 |
| MP |
|
Iraqi Seismic Observatory | 2014 | 2599 |
| MQ |
|
Martinique Seismic and Volcano Observatory Network | 1935 | 2599 |
| MR |
|
Mauritius Seismic Network | 2000 | 2599 |
| MS |
|
Singapore Seismological Network | 1996 | 2599 |
| MU |
|
Miami University Seismic Network | 2005 | 2599 |
| MX |
|
Mexican National Seismic Network | 1970 | 2599 |
| MY |
|
Malaysian National Seismic Network | 2003 | 2599 |
| MZ |
|
National Seismic Network of Mozambique | 2022 | 2599 |
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