| 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 |
| UD |
|
UD network | 1980 | 2599 |
| UF |
|
Centro de Investigación de Resiliencia y Riesgos Multi-Amenazas | 2022 | 2599 |
| UH |
|
UH Infrasound Network | 2004 | 2599 |
| UI |
|
North Idaho Seismic Network | 2004 | 2599 |
| UK |
|
UK Schools Seismic Network | 2005 | 2599 |
| UL |
|
USGS Low Frequency Geophysical Data Network | 1974 | 2999 |
| UM |
|
University of Montana Seismic Network | 2017 | 2599 |
| UO |
|
|
|
|
| UP |
|
Swedish National Seismic Network | 1980 | 2599 |
| US |
|
United States National Seismic Network |
|
|
| UU |
|
University of Utah Regional Seismic Network | 1962 | 2599 |
| UW |
|
|
|
|
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