In response to recent eruptions at Mount St. Helens and with
support from the USGS Volcanic Hazards Program, the Cascades
Volcano Observatory (CVO) has initiated a program to monitor all
potentially-active volcanoes of the Cascade Range. As part of that
effort, we installed tilt networks and obtained baseline
measurements at Mount Shasta and Lassen Peak, California during
July 1981. At the same time, baseline electronic distance
measurements (EDM) were made and fumarole surveys were conducted by
other crews from CVO. Annual surveys are planned initially, with
subsequent visits as conditions warrant. These geodetic and
geochemical measurements supplement a program of continuous seismic
monitoring of Cascade volcanoes by the USGS Office of Earthquake
Studies in cooperation with local universities. Other tilt networks
were established at Mount Baker in 1975 and at Mount St. Helens in
1981. EDM networks were established at Mount Baker in 1975, Mount
St. Helens in 1980, and Crater Lake in 1981. Additional tilt and/or
EDM networks are planned for Mount Rainier, Mount Hood, Glacier
Peak, Three Sisters, and Crater Lake as funds permit.
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