USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Dry Tilt Network at Mount Rainier, Washington
--
Dzurisin, D., Johnson, D.J., and Symonds, R.B., 1983,
Dry Tilt Network at Mount Rainier, Washington:
U.S. Geological Survey Open-File Report 83-277
Abstract
In addition to its primary responsibility of monitoring active Mount St. Helens,
the David A. Johnson Cascades Volcano Observatory (CVO) has been charged with
obtaining baseline geodetic and geochemical information at each of the other
potentially active Cascade volcanoes. Dry tilt and/or trilateration networks
were established during 1975-82 at Mount Baker, Mount St. Helens, Mount Hood,
Mount Shasta, Lassen peak, Crater Lake, and Long Valley caldera; coverage was
extended during September 1982 to include Mount Rainier.
The dramatic reawakening of Mount St. Helens in March 1980 focused increased
attention on the possibility of future eruptions elsewhere in the Cascade Range.
Mount Baker had stirred briefly only 5 year earlier, prompting the installation
of dry tilt (1975) and trilateration (1981) networks there to monitor possible
ground deformation associated with increased thermal activity. A trilateration
network was established on Mount Hood in 1980; tilt and trilateration networks
were installed at Mount Shasta, Lassen Peak, and Crater Lake during 1981 and
remeasured with null results in 1982. Dry tilt stations were likewise installed
at Long Valley caldera during summer 1982, in response to increased seismicity
and ground deformation there since 1978. This program of geodetic surveillance
was extended to Mount Rainier during September 1982, to supplement continuous
seismic monitoring there by the U.S.Geological Survey and The University of
Washington.
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06/26/00, Lyn Topinka