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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.
-- Dzurisin, et.al., 1982
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[Map,36K,GIF]
Long Valley Observatory Website