USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Tilt Measurements at Long Valley Caldera, California, May-August 1982
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Dzurisin, D., and Cashman, K., and Sylvester, A.G., 1982,
Tilt Measurements at Long Valley Caldera, California, May-August 1982:
U.S. Geological Survey Open-File Report 82-893
Abstract
The Mammoth Lakes area in east-central California has experienced unusual
seismicity and ground deformation since 1978, highlighted by four Magnitude
>6 earthquakes in May 1980 and by the discovery soon thereafter of a broad
uplift within Long Valley caldera. Recurrent seismic swarms during June
1980-May 1982 raised concern over the possibility of renewed volcanic activity
in the foreseeable future, prompting a USGS Notice of Potential Volcanic Hazard
on 28 May 1982. As part of an intensified Long Valley monitoring effort
sponsored by the USGS Volcanic Hazards Program, a network of nine tilt sites was
established near Mammoth Lakes in May and July 1982. This report describes
those stations and presents results from three tilt resurveys during July-August
1982.
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06/22/00, Lyn Topinka