| UG |
Unocal Geothermal Northern California Network |
- Unocal Corporation, United States of America
|
United States of America |
— |
| UH |
UH Infrasound Network |
|
|
— |
| UI |
North Idaho Seismic Network |
- University of Idaho, United States of America
|
|
— |
| UK |
UK Schools Seismic Network |
- University of Leicester (SEIS UK), United Kingdom
|
|
— |
| UL |
USGS Low Frequency Geophysical Data Network |
- USGS Menlo Park, United States of America
|
|
— |
| UM |
University of Montana Seismic Network |
- University Of Montana, United States of America
|
|
DOI |
| UN |
Uganda National Seismological Network |
- Directorate of Geological Survey and Mines, Uganda (DGSM), Uganda
|
Uganda |
DOI |
| UO |
Pacific Northwest Seismic Network - University of Oregon |
- University of Oregon, United States of America
|
|
DOI |
| UP |
Swedish National Seismic Network |
- Uppsala University, Sweden
|
|
DOI |
| UQ |
UNSA Regional Seismic Network |
- Universidad Nacional de San Agustín de Arequipa - UNSA
|
— |
DOI |
| UR |
UKArray |
|
United Kingdom |
DOI |
| US |
United States National Seismic Network |
|
|
DOI |
| UT |
Ukrainian National Seismic Network |
|
— |
DOI |
| UU |
University of Utah Regional Seismic Network |
|
|
DOI |
| UV |
Red Sismológica del Suroccidente Colombiano |
|
|
DOI |
| UW |
Pacific Northwest Seismic Network - University of Washington |
- University of Washington, United States of America
|
|
DOI |
| UX |
Red Sismologica del Nororiente Colombiano |
|
— |
DOI |
| UY |
Observatorio Geofisico del Uruguay |
- Universidad de la Republica, Uruguay
|
|
DOI |
| UZ |
Uzbekistan Digital Seismic Network |
|
|
DOI |
| VA |
VAL D'AGRI NETWORK |
|
|
DOI |
| VB |
Valencian Broadband Seismic Network |
|
|
DOI |
| VC |
Red Nacional de Vigilancia Volcánica Chile (VC) |
|
|
— |
| VD |
High Agri Valley geophysical Observatory |
|
|
DOI |
| VE |
Red Sismológica Satelital Nacional |
|
|
DOI |
| VG |
Seismic Network of the Indonesian Center for Volcanology and Geological Hazard Mitigation |
|
|
DOI |
| VI |
Icelandic National Digital Seismograph Network |
|
|
DOI |
| VK |
California Volcano Observatory |
|
— |
DOI |
| VL |
Vale SA Network |
- Universidade de Sao Paulo, USP, Brazil
|
Brazil |
DOI |
| VM |
Marche Seismic Network |
|
— |
DOI |
| VN |
Voronezh Regional Seismic Network of the Russian Federation |
- Voronezh Laboratory of the Geophysical Survey of the Russian Academy of Sciences
|
— |
DOI |
| VO |
CAVONE SEISMIC NETWORK |
|
|
DOI |
| VP |
Programa de Instrumentación Sísmica (PINS) |
|
— |
DOI |
| VR |
Virgo Interferometric Antenna for Gravitational Waves Detection |
|
|
DOI |
| VS |
Evora Seismic Network |
|
|
DOI |
| VT |
Taiwan Volcano Observatory |
- Taiwan Volcano Observatory (TVO), Taiwan
|
|
DOI |
| VU |
Vanuatu Seismic Network |
|
|
— |
| VV |
Observatorio Argentino de Vigilancia Volcánica |
|
Argentina |
— |
| WA |
West Central Argentina Network |
- Universidad Nacional de San Juan (UNSJ), Argentina
|
|
— |
| WB |
West Bohemia Local Seismic Network |
|
|
DOI |
| WC |
Curacao Seismic Network |
|
|
— |
| WD |
Western Canada Deformation Array |
|
— |
DOI |
| WE |
Western Ionian Sea Network |
|
— |
— |
| WF |
Woodbank |
|
— |
DOI |
| WG |
WA Array |
|
— |
DOI |
| WI |
West Indies French Seismic Network |
|
|
DOI |
| WK |
Wake Island Hydrophone Array |
|
United States of America |
— |
| WM |
Western Mediterranean Seismic Network |
- Real Instituto y Observatorio de la Armada, Spain
|
|
DOI |
| WN |
WINSENT |
|
— |
DOI |
| WR |
California Division of Water Resources |
- California Division of Water Resources, United States of America
|
|
— |
| WS |
Seismic Network of Repuplika Srpska |
- Republicki Hidrometeorološki Zavod, Serbia
|
Bosnia and Herzegovina |
— |
