Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; June 1977; v. 67; no. 3; p. 579-586
© 1977 Seismological Society of America
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Deformation at Middleton Island, Alaska, during the decade after the Alaska earthquake of 1964

W. H. PRESCOTT and M. LISOWSKI

U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025

Abstract

Comparison of precise leveling done on Middleton Island in the Gulf of Alaska in 1966, 1974, and 1975 indicates that between 1974 and 1975 the island was tilting down to the northwest at a rate of 5.0 ± 0.8 µrad/year. The direction of tilt is normal to the axis of the Aleutian Trench 60 km to the southeast. The data are inadequate to determine variations in the rate since the earthquake, but suggest that it has been higher. A simple model for slip on the near-surface projection of the fault surface that ruptured in 1964 suggests that on the order of Formula meters/yr of slip would be required to account for the observed tilt.




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