| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| 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 |
| IL |
|
Iranian Long Period Array | 1966 | 1979 |
| IM |
|
International Miscellaneous Stations | 1965 | 2599 |
| IN |
|
National Seismic Network of India | 2000 | 2599 |
| IO |
|
International OGS Network | 2014 | 2599 |
| IP |
|
Instituto Superior Tecnico Broadband Seismic Network | 2002 | 2599 |
| IU |
|
Global Seismograph Network - IRIS/USGS | 1988 | 2599 |
| IV |
|
Italian National Seismic Network | 1988 | 2599 |
| IW |
|
Intermountain West Seismic Network | 2003 | 2599 |
| PA |
|
ChiriNet | 2000 | 2599 |
| PB |
|
Plate Boundary Observatory Borehole Seismic Network | 2004 | 2599 |
| PE |
|
Pennsylvania State Seismic Network | 2004 | 2599 |
| PF |
|
Piton de la Fournaise Volcano Observatory Network (Reunion Island) | 1980 | 2599 |
| PI |
|
PASSCAL Pier Test Data | 2006 | 2599 |
| PL |
|
Polish Seismological Network | 1990 | 2599 |
| PM |
|
Portuguese National Seismic Network | 2006 | 2599 |
| PN |
|
PEPP-Indiana | 1998 | 2599 |
| PO |
|
Portable Observatories for Lithospheric Analysis and Research Investigating Seismicity | 2000 | 2599 |
| PP |
|
Princeton Earth Physics Program | 1999 | 2599 |
| PQ |
|
Public Safety Geoscience Program Canadian Research Network | 2013 | 2599 |
| PR |
|
Puerto Rico Seismic Network & Puerto Rico Strong Motion Program | 1986 | 2599 |
| PS |
|
Pacific21 | 1989 | 2599 |
| PT |
|
Pacific Tsunami Warning Seismic System | 1965 | 2599 |
| PY |
|
Piñon Flats Observatory Array | 2014 | 2599 |
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