| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| IA |
|
BMG-Net, Indonesia (IA-Net) | 1980 | 2599 |
| IB |
|
IberArray | 2007 | 2014 |
| IC |
|
New China Digital Seismograph Network | 1992 | 2599 |
| ID |
|
Project IDA VLP Seismometer Network - UCSD/SIO/IGPP | 1975 | 1995 |
| IE |
|
INL Seismic Monitoring Program | 1972 | 2599 |
| II |
|
Global Seismograph Network - IRIS/IDA | 1986 | 2599 |
| IJ |
|
Istanbul University Seismic Network | 2013 | 2599 |
| IL |
|
Iranian Long Period Array | 1966 | 1979 |
| IM |
|
International Miscellaneous Stations | 1965 | 2599 |
| IN |
|
National Seismic Network of India | 2000 | 2599 |
| IO |
|
|
|
2599 |
| IP |
|
|
|
2599 |
| IQ |
|
Plate Boundary Project Iquique, GFZ Potsdam, Germany | 1980 | 2599 |
| IS |
|
Israelian Broadband Seismological Network (GII-Net) | 1980 | 2599 |
| IU |
|
|
|
2599 |
| IV |
|
|
1988 | 2599 |
| IW |
|
Intermountain West Seismic Network | 2003 | 2599 |
| IX |
|
Irpinia Seismic Network, Italy | 2005 | 2599 |
| IY |
|
Rete Universita Calabria | 2021 | 2599 |
| RA |
|
RESIF-RAP Accelerometric permanent network | 1995 | 2500 |
| RB |
|
|
2002 |
|
| RC |
|
BYU-Idaho Network | 2001 | 2599 |
| RD |
|
CEA/DASE broad-band permanent network | 1962 | 2500 |
| RE |
|
|
|
|
| RF |
|
Friuli Venezia Giulia Accelerometric Network, Italy | 1993 | 2599 |
| RI |
|
National Seismic Network of Argentina | 1972 | 2599 |
| RM |
|
Regional Integrated Multi-Hazard Early Warning System | 2008 | 2599 |
| RN |
|
RuhrNet - Ruhr-University Bochum, Germany | 1980 | 2599 |
| RO |
|
Romanian Seismic Network |
|
2599 |
| RS |
|
Regional Seismic Test Network | 1982 | 1986 |
| RV |
|
Regional Alberta Observatory for Earthquake Studies Network | 2013 | 2599 |
| RW |
|
Rwanda National Seismic Network | 2019 | 2599 |
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