| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| 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 |
| T3 |
|
Rete Accelerometrica Terna | 2019 | 2599 |
| TA |
|
USArray Transportable Array | 2003 | 2599 |
| TC |
|
Red Sismológica Nacional de Costa Rica | 1973 | 2599 |
| TD |
|
TransAlta Monitoring Network | 2013 | 2599 |
| TF |
|
Tajikistan National Seismic Network | 2022 | 2599 |
| TJ |
|
Tajikistan National Seismic Network | 2005 | 2599 |
| TM |
|
Thai Seismic Monitoring Network | 2008 | 2599 |
| TO |
|
Tectonic Observatory - MASE, VEOX , PeruSE, CCSE | 2004 | 2599 |
| TP |
|
Rete di monitoraggio microsismico installata presso la concessione Gorgoglione | 2018 | 2599 |
| TR |
|
Eastern Caribbean Seismograph Network | 1965 | 2599 |
| TT |
|
Seismic Network of Tunisia | 2008 | 2599 |
| TW |
|
Broadband Array in Taiwan for Seismology | 1994 | 2599 |
| TX |
|
Texas Seismological Network | 2016 | 2599 |
| TZ |
|
Ol Doinyo Lengai, TZ Volcano Monitoring | 2017 | 2599 |
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