| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| DE |
|
Nanometrics Research Network | 2013 | 2599 |
| DK |
|
Danish Seismological Network | 1976 | 2599 |
| DR |
|
Centro Nacional de Sismologia (CNS) | 1998 | 2599 |
| DT |
|
Carnegie Analog Broadband Seismograph Network | 1965 | 2003 |
| DU |
|
Seismological Association of Australia | 1995 | 2599 |
| DW |
|
Digital World-Wide Standardized Seismograph Network | 1980 | 1994 |
| 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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