| 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 |
| WA |
|
West Central Argentina Network | 1958 | 2599 |
| WC |
|
Curacao Seismic Network | 2006 | 2599 |
| WI |
|
West Indies French Seismic Network | 2008 | 2599 |
| WM |
|
Western Mediterranean Seismic Network | 1980 | 2599 |
| WU |
|
The Southern Ontario Seismic Network | 1991 | 2599 |
| WW |
|
Idaho Seismic Network | 2022 | 2599 |
| WY |
|
Yellowstone National Park Seismograph Network | 1983 | 2599 |
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