| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| H2 |
|
Hawaii 2 Observatory | 1999 | 2003 |
| HG |
|
High-Gain Long-Period Network | 1972 | 1979 |
| HK |
|
Hong Kong Seismograph Network | 2009 | 2599 |
| HL |
|
National Observatory of Athens Seismic Network | 1997 | 2599 |
| HT |
|
Aristotle University of Thessaloniki Seismological Network | 1981 | 2599 |
| HU |
|
Hungarian National Seismological Network | 1992 | 2599 |
| HV |
|
Hawaiian Volcano Observatory Network | 1956 | 2599 |
| HW |
|
Hanford Washington Seismic Network | 1980 | 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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