| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| UD |
|
UD network | 1980 | 2599 |
| UF |
|
Centro de Investigación de Resiliencia y Riesgos Multi-Amenazas | 2022 | 2599 |
| UH |
|
UH Infrasound Network | 2004 | 2599 |
| UI |
|
North Idaho Seismic Network | 2004 | 2599 |
| UK |
|
UK Schools Seismic Network | 2005 | 2599 |
| UL |
|
USGS Low Frequency Geophysical Data Network | 1974 | 2999 |
| UM |
|
University of Montana Seismic Network | 2017 | 2599 |
| UO |
|
|
|
|
| UP |
|
Swedish National Seismic Network | 1980 | 2599 |
| US |
|
United States National Seismic Network |
|
|
| UU |
|
University of Utah Regional Seismic Network | 1962 | 2599 |
| UW |
|
|
|
|
| WA |
|
West Central Argentina Network | 1958 | 2599 |
| WB |
|
West Bohemia Local Seismic Network (WEBNET) | 1980 | 2599 |
| WC |
|
Curacao Seismic Network |
|
2599 |
| WG |
|
WG_(WA-ARRAY Network) | 2022 | 2599 |
| WI |
|
West Indies French Seismic Network | 2008 |
|
| WM |
|
|
1980 | 2599 |
| WR |
|
California Division of Water Resources | 1964 | 3000 |
| WU |
|
The Southern Ontario Seismic Network | 1991 | 2599 |
| WW |
|
Idaho Seismic Network | 2022 | 2599 |
| WY |
|
Yellowstone National Park Seismograph Network | 1983 | 2599 |
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by the CoreTrustSeal Standards and Certification Board
