| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| C2 |
|
1980 | 2599 | |
| C8 |
|
Canadian Seismic Research Network | 1980 | 2599 |
| CC |
|
Cascade Chain Volcano Monitoring () | 2015 | 2999 |
| CE |
|
California Strong Motion Instrumentation Program | 1990 | 2999 |
| CI |
|
Southern California Seismic Network | 1926 | 2999 |
| CN |
|
Canadian National Seismograph Network | 1980 | 2599 |
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