Tilt and Seismicity Changes in the Shumagin Seismic Gap

Creators: Beavan, J.; Hauksson, E.; McNutt, S. R.; Bilham, R.; Jacob, K. H.

Abstract

Changes in the ground surface tilt and in the rate of seismicity indicate that an aseismic deformation event may have occurred between 1978 and 1980 along the plate boundary in the eastern Aleutians, Alaska, within the Shumagin seismic gap. Pavlof Volcano was unusually quiescent during this period. The proposed event would cause an increase of stress on the shallow locked portion of the plate boundary, bringing it closer to rupture in a great earthquake.

Additional Information

© 1983 American Association for the Advancement of Science. Received for publication 4 March 1983. Revision received 27 May 1983. We thank Tom Ray, Margie Winslow, and Ken Hurst who helped with the leveling measurements; Mary Ann Luckman, John Armbruster, and Stephen Rosen who participated in the data reduction; and David Simpson, Lynn Sykes, and an anonymous reviewer who made helpful comments on the text. This work was supported by National Science Foundation grant EAR 79-10608; U.S. Geological Survey National Earthquake Reduction Program contracts 14-08-000117679, 19745 and 21246; Department of Energy contract DE-AS02-76ERO3134; and National Oceanic and Atmospheric Administration contract NOAA-03-5-022-70. This is Lamont-Doherty Geological Observatory Contribution No. 3529.

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Tilt and Seismicity Changes in the Shumagin Seismic Gap

Abstract

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