| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| H2 |
|
Hawaii 2 Observatory | 1999 | 2003 |
| HA |
|
National and Kapodistrian University of Athens, Seismological Laboratory (NKUA) | 2008 | 2599 |
| HC |
|
Seismological Network of Crete | 2006 | 2599 |
| HE |
|
Finnish National Seismic Network | 1980 | 2599 |
| HF |
|
Swedish Seismic Array Network | 1980 | 2599 |
| HG |
|
High-Gain Long-Period Network | 1972 | 1979 |
| HI |
|
Institute of Engineering Seismology and Earthquake Engineering (ITSAK) Strong Motion Network | 1981 | 2599 |
| HK |
|
Hong Kong Seismograph Network | 2009 | 2599 |
| HL |
|
|
1997 | 2599 |
| HN |
|
Hungarian National Infrasound Network | 2017 | 2599 |
| HP |
|
University of Patras, Seismological Laboratory (PSLNET) | 2000 | 2599 |
| HS |
|
HLNUGNetz | 1980 | 2599 |
| HT |
|
Aristotle University of Thessaloniki Seismological Network | 1981 | 2599 |
| HU |
|
|
1992 | 2599 |
| HV |
|
Hawaiian Volcano Observatory Network | 1956 | 2599 |
| HW |
|
Hanford Washington Seismic Network | 1980 | 2599 |
| RA |
|
RESIF-RAP Accelerometric permanent network | 1995 | 2500 |
| RB |
|
|
2002 |
|
| RC |
|
BYU-Idaho Network | 2001 | 2599 |
| RD |
|
CEA/DASE broad-band permanent network | 1962 | 2500 |
| RE |
|
|
|
|
| RF |
|
Friuli Venezia Giulia Accelerometric Network, Italy | 1993 | 2599 |
| RI |
|
National Seismic Network of Argentina | 1972 | 2599 |
| RM |
|
Regional Integrated Multi-Hazard Early Warning System | 2008 | 2599 |
| RN |
|
RuhrNet - Ruhr-University Bochum, Germany | 1980 | 2599 |
| RO |
|
Romanian Seismic Network |
|
2599 |
| RS |
|
Regional Seismic Test Network | 1982 | 1986 |
| RV |
|
Regional Alberta Observatory for Earthquake Studies Network | 2013 | 2599 |
| RW |
|
Rwanda National Seismic Network | 2019 | 2599 |
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