| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| C |
|
Chilean National Seismic Network | 1991 | 2599 |
| C0 |
|
Colorado Geological Survey Seismic Network | 2016 | 2599 |
| C1 |
|
Red Sismologica Nacional | 2012 | 2599 |
| C5 |
|
University of Cambridge seismology | 1993 | 2599 |
| C8 |
|
Canadian Seismic Research Network | 2002 | 2599 |
| CA |
|
Catalan Seismic Network | 1984 | 2599 |
| CB |
|
China National Seismic Network, Data Management Centre of China National Seismic Network at Institute of Geophysics, CEA | 2000 | 2599 |
| CC |
|
Cascade Chain Volcano Monitoring | 2001 | 2599 |
| CD |
|
China Digital Seismograph Network | 1986 | 2001 |
| CH |
|
Switzerland Seismological Network | 1986 | 2599 |
| CI |
|
Southern California Seismic Network | 1926 | 2599 |
| CK |
|
CAREMON Central Asian Cross-border network | 2009 | 2599 |
| CM |
|
Red Sismologica Nacional de Colombia | 1993 | 2599 |
| CN |
|
Canadian National Seismograph Network | 1975 | 2599 |
| CO |
|
South Carolina Seismic Network | 1987 | 2599 |
| CS |
|
Caucusus Array | 1990 | 1994 |
| CT |
|
California Transect Network | 1995 | 1995 |
| CU |
|
Caribbean USGS Network | 2006 | 2599 |
| CW |
|
Servicio Sismologico Nacional de Cuba | 1998 | 2599 |
| CY |
|
Cayman Islands | 2006 | 2599 |
| CZ |
|
Czech Regional Seismic Network | 1973 | 2599 |
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