USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
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
--
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:
U.S. Geological Survey Open-File Report 85-205, 96p.
Abstract
Personnel of the U.S.Geological Survey's Cascades Volcano Observatory
established trilateration networks at Mount Baker, Mount Rainier, Mount Hood,
Crater Lake, Mount Shasta, and Lassen Peak in 1980-1984. These networks are
capable of detecting changes in slope distance of several centimeters or more.
The networks were established to provide baseline information on potentially
active volcanoes and were designed along guidelines found useful at Mount St.
Helens. Periodic reoccupation of the networks is planned as part of the
overall monitoring program of Cascades volcanoes. Methodology, slope distance
and vertical angle data, maps of the networks, and benchmark descriptions are
presented in this report. Written benchmark descriptions are augmented by
photographs, which we have found by experience to very useful in relocating
the marks. All repeat measurements at the six volcanoes are probably within
measurement error.
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01/29/01, Lyn Topinka