| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| M1 |
|
MONET IPE MU Brno | 1980 | 2599 |
| M8 |
|
Australian Semi-Permanent Support Network (MATE) | 2024 | 2599 |
| MB |
|
Montana Regional Seismic Network | 1996 | 2599 |
| MC |
|
Montserrat CALIPSO Borehole Network | 2008 | 2599 |
| MD |
|
Moldova Network | 1980 | 2599 |
| ME |
|
Montenegrian Seismic 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 |
| MK |
|
Seism. Network of the Republic of North Macedonia | 1980 | 2599 |
| ML |
|
Malta Seismic Network | 2014 | 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 |
|
| MR |
|
Mauritius Seismic Network | 2000 | 2599 |
| MS |
|
Singapore Seismological Network | 1996 | 2599 |
| MT |
|
OMIV French Landslide Observatory | 2006 | 2500 |
| MU |
|
Miami University Seismic Network | 2005 | 2599 |
| MX |
|
Mexican National Seismic Network |
|
|
| MY |
|
Malaysian National Seismic Network | 2003 | 2599 |
| MZ |
|
National Seismic Network of Mozambique | 2022 | 2599 |
| RA |
|
RESIF-RAP Accelerometric permanent network | 1995 | 2500 |
| RB |
|
|
2002 |
|
| RC |
|
BYU-Idaho Network | 2001 | 2599 |
| RD |
|
CEA/DASE broad-band permanent network | 1962 | 2500 |
| RE |
|
|
|
|
| RF |
|
Friuli Venezia Giulia Accelerometric Network, Italy | 1993 | 2599 |
| RI |
|
National Seismic Network of Argentina | 1972 | 2599 |
| RM |
|
Regional Integrated Multi-Hazard Early Warning System | 2008 | 2599 |
| RN |
|
RuhrNet - Ruhr-University Bochum, Germany | 1980 | 2599 |
| RO |
|
Romanian Seismic Network |
|
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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