| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| O2 |
|
Oklahoma Consolidated Temporary Seismic Networks | 2018 | 2599 |
| OC |
|
Observatorio Sismológico CIGEOBIO CONICET | 2017 | 2599 |
| OE |
|
Austrian Seismic Network | 1987 | 2599 |
| OH |
|
Ohio Seismic Network | 1999 | 2599 |
| OI |
|
Oceania International | 2023 | 2599 |
| OK |
|
Oklahoma Seismic Network | 1978 | 2599 |
| ON |
|
Rede Sismográfica do Sul e do Sudeste | 2011 | 2599 |
| OO |
|
Ocean Observatories Initiative | 2013 | 2599 |
| OQ |
|
Oklahoma Structural and Site Effects Network | 2017 | 2599 |
| OV |
|
Observatorio Vulcanológico y Sismológico de Costa Rica | 1984 | 2599 |
| OW |
|
Ocean Networks Canada Onshore Network | 2018 | 2599 |
| OX |
|
North-East Italy Seismic Network | 2016 | 2599 |
| OY |
|
OGS Mobile LAB | 2019 | 2599 |
| OZ |
|
SRC eqServer | 1976 | 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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