| 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 |
| K5 |
|
Bhutan Seismic Network | 2017 | 2599 |
| KC |
|
|
|
2599 |
| KD |
|
Decentralized onsite earthquake early warning network Bishkek | 2012 | 2599 |
| KG |
|
Korean Seismic Network - KIGAM | 1997 | 2599 |
| KN |
|
Kyrgyz Seismic Telemetry Network | 1991 | 2599 |
| KO |
|
|
1971 | 2599 |
| KP |
|
|
|
2599 |
| KQ |
|
CAU Kiel | 1980 | 2599 |
| KR |
|
Kyrgyz Digital Network | 2007 | 2599 |
| KS |
|
Korea National Seismography Network (KNSN-KMA) | 2006 | 2599 |
| KT |
|
KROTONE SEISMIC NETWORK | 2003 | 2599 |
| KV |
|
KivuSNet | 2013 | 2022 |
| KW |
|
Kuwait National Seismic Network | 1997 | 2599 |
| KY |
|
Kentucky Seismic and Strong Motion Network | 1982 | 2599 |
| KZ |
|
Kazakhstan Network | 1994 | 2599 |
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