| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| LA |
|
Los Angeles Basin Seismic Network | 1988 | 2999 |
| LB |
|
Leo Brady Network | 1994 |
|
| LC |
|
LSC (Laboratorio Subterraneo de Canfranc) | 1980 | 2599 |
| LD |
|
Lamont-Doherty Cooperative Seismographic Network | 1970 | 2599 |
| LE |
|
LE | 1980 | 2599 |
| LH |
|
Large High-Performance Outdoor Shake Table | 2023 | 2599 |
| LI |
|
Laser Interferometer Gravitational-Wave Experiment | 2000 | 2599 |
| LM |
|
Michigan State University Seismic Network | 2016 | 2599 |
| LO |
|
Observatorio Sismológico Politécnico Loyola | 2012 | 2599 |
| LX |
|
|
|
2599 |
| 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 |
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