William H. Prescott

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Strain accumulation during the 1980-85 interval has been measured by means of trilateration surveys in the Shumagin and Yakataga seismic gaps, which are the two regions identified as the most likely sites for the next great thrust earthquakes along the Alaska-Aleutian arc. No significant strain accumulation was detected in the Shumagin gap, but experience(More)
Analysis of 27 repeated observations of Global Positioning System (GPS) position-difference vectors, up to 11 kilometers in length, indicates that the standard deviation of the measurements is 4 millimeters for the north component, 6 millimeters for the east component, and 10 to 20 millimeters for the vertical component. The uncertainty grows slowly with(More)
The plate tectonics model of the Pacific moving northwest relative to North America implies that the regional strain in California should be simple shear across a vertical plane striking N45 degrees W or equivalently equal parts of north-south contraction and east-west extension. Measurements of the strain accumulation at seven separate sites in southern(More)
1. R. W. Simpson, S. S. Schulz, L. D. Dietz, R. O. Burford, Pure Appl. Geophys. 126, 665 (1988). 2. Working Group on California Earthquake Probabilities, U.S. Geol. Surv. Circ. 1053, 51 (1990). 3. J. J. Lienkaemper, G. Borchardt, M. Lisowski [J. Geophys. Res. 96, 18261 (1991)], being revised as J. J. Lienkaemper and J. S. Galehouse, in preparation; J. J.(More)
Frequently repeated strain measurements near Palmdale, California, during the period from 1971 through 1980 indicate that, in addition to a uniform accumulation of right-lateral shear strain (engineering shear, 0.35 microradian per year) across the San Andreas fault, a 1-microstrain contraction perpendicular to the fault that accumulated gradually during(More)
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