|Region:||Canada and Western USA|
|Measurement method(s):||GPS - continuous, EDM|
|Duration of observation:||1980 - 1984, 2005 - present|
|Inferred cause of deformation:|
|Characteristics of deformation:|
In 1980-1984 the U.S Geological Survey established and remeasured a trilateration network at Hood, measuring slope distances with EDM. Any changes in repeat measurements of this network were attributed to random error (Chadwick et al. 1985).
Two continuous GPS receivers were installed in 2005 – 2006. These observations show no measurable deformation in the region (CVO website) (http://earthquake.usgs.gov/monitoring/gps/Pacific_Northwest/).
|Reference:||Chadwick, W. W., Iwatsubo, E. Y., Swanson, D. A., and Ewert, J. W. (1985) Measurements of Slope Distances and Vertical Angles at Mount Baker and Mount Rainier, Washington, Mount Hood and Crater Lake, Oregon, and Mount Shasta and Lassen Peak, California, 1980-1984, US Department of the Interior, Geological Survey, Open File Report 85-205.|
|Reference:||U.S. Geological Survey Cascade Volcano Observatory (CVO) http://volcanoes.usgs.gov/volcanoes/mount_hood/mount_hood_monitoring_93.html|
Hood as seen from the city of Portland, Oregon. Source: U.S. Geological Survey CVO website