USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Measurements of Slope Distances and Zenith Angles at
Newberry and South Sister
Volcanoes, Oregon, 1985-1986
--
Iwatsubo, E.Y., Topinka, L., and Swanson, D.A., 1988,
Measurements of Slope Distances and Zenith Angles at
Newberry and South Sister
Volcanoes, Oregon, 1985-1986:
U.S. Geological Survey Open-File Report 88-377, 51p.
Abstract
Between 1980 and 1984, the U.S.Geological Survey's David A. Johnston Cascades
Volcano Observatory (CVO) established baseline geodetic networks at Mount Baker,
Mount Rainer, and Mount St. Helens in Washington, Mount Hood and Crater Lake in
Oregon, and Mount Shasta and Lassen Peak in California. To this list of
potentially active volcanoes, CVO extended its monitoring program in 1985 to
include Newberry and South Sister volcanoes in central Oregon. The Newberry and
South Sister networks were re-measured in 1986 and will be measured periodically
in future years. Improvements since 1984 in the recording of endpoint and
flightline temperatures resulted in better overall data than obtained
previously. The improvements included: calibration of all the sensors and
precision thermistors, installation of a new recording system for flightline
data, and recording of endpoint temperatures 6 m above ground level. The data
collected in 1985 and 1986 indicate little or no apparent deformation at either
volcano between surveys.
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05/30/00, Lyn Topinka