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Science 6 August 1982:
Vol. 217. no. 4559, pp. 531 - 533
DOI: 10.1126/science.217.4559.531
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Articles

Magmatic Resurgence in Long Valley Caldera, California: Possible Cause of the 1980 Mammoth Lakes Earthquakes

J. C. SAVAGE 1 and M. M. CLARK 1

1 U.S. Geological Survey, Menlo Park, California 94025

Changes in elevation between 1975 and October 1980 along a leveling line across the Long Valley caldera indicate a broad (half-width, 15 kilometers) uplift (maximum, 0.25 meter) centered on the old resurgent dome. This uplift is consistent with reinflation of a magma reservoir at a depth of about 10 kilometers. Stresses generated by this magmatic resurgence may have caused the sequence of four magnitude 6 earthquakes near Mammoth Lakes in May 1980.

Submitted on November 16, 1981
Revised on February 18, 1982


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