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Science 17 December 1982:
Vol. 218. no. 4578, pp. 1217 - 1219
DOI: 10.1126/science.218.4578.1217
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Articles

Observations of Strain Accumulation Across the San Andreas Fault Near Palmdale, California, with a Two-Color Geodimeter

J. O. LANGBEIN 1, M. F. LINKER 1, A. MCGARR 1, and L. E. SLATER 2

1 U.S. Geological Survey, Menlo Park, California 94025
2 Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder 80309

Two-color laser ranging measurements during a 15-month period over a geodetic network spanning the San Andreas fault near Palmdale, California, indicate that the crust expands and contracts aseismically in episodes as short as 2 weeks. Shear strain parallel to the fault has accumulated monotonically since November 1980, but at a variable rate. Improvements in measurement precision and temporal resolution over those of previous geodetic studies near Palmdale have resulted in the definition of a time history of crustal deformation that is much more complex than formerly realized.

Submitted on March 24, 1982
Revised on October 12, 1982


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