| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| D0 |
|
Kamchatka seismic monitoring network | 2015 | 2016 |
| DE |
|
Nanometrics Research Network | 2013 | 2599 |
| DK |
|
|
|
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 |
| DZ |
|
Algerian National Seismic Network | 1980 | 2599 |
| 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 |
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