| 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 |
| S |
|
Seismology at School Program, ETH Zurich | 2008 | 2599 |
| S1 |
|
Australian Seismometers in Schools | 2011 | 2599 |
| S8 |
|
SensorEra Seismic Network | 2023 | 2599 |
| SB |
|
UC Santa Barbara Engineering Seismology Network | 1989 | 2599 |
| SC |
|
New Mexico Tech Seismic Network | 1999 | 2599 |
| SE |
|
Southeastern Appalachian Cooperative Seismic Network | 1999 | 2599 |
| SF |
|
San Andreas Fault Observatory at Depth | 2002 | 2599 |
| SG |
|
International Geodynamics and Earth Tide Service | 1997 | 2599 |
| SH |
|
Shumagin-East Aleutian Network | 1981 | 1991 |
| SK |
|
Slovak National Seismic Network | 2002 | 2599 |
| SL |
|
Seismic Network of the Republic of Slovenia | 1990 | 2599 |
| SN |
|
Southern Great Basin Network | 1980 | 2599 |
| SP |
|
South Carolina Earth Physics Project | 2000 | 2004 |
| SR |
|
Seismic Research Observatory | 1974 | 1993 |
| SS |
|
SINGLE STATION | 1970 | 2599 |
| SV |
|
Servicio Nacional de Estudios Territoriales (SNET), El Salvador | 2004 | 2599 |
| SY |
|
Synthetic Seismograms | 1900 | 2599 |
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