| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| CK |
|
CAREMON, Central Asian Cross-border Network (CAREMON) | 1980 | 2599 |
| CN |
|
Canadian National Seismograph Network | 1980 | 2599 |
| CP |
|
CIVISA Seismo-Volcanic Monitoring Network-Azores Islands | 2018 | 2599 |
| CX |
|
IPOC Seismic Network (Integrated Plate boundary Observatory Chile) | 1980 | 2599 |
| CZ |
|
Czech Regional Seismic Network | 1973 | 2599 |
| IA |
|
BMG-Net, Indonesia (IA-Net) | 1980 | 2599 |
| IO |
|
EvK2-CNR Pyramid Laboratory - Mount Everest | 1980 | 2599 |
| IQ |
|
Plate Boundary Project Iquique, GFZ Potsdam, Germany | 1980 | 2599 |
| IS |
|
Israelian Broadband Seismological Network (GII-Net) | 1980 | 2599 |
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