Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; October 1980; v. 70; no. 5; p. 1595-1606
© 1980 Seismological Society of America
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St. Elias, Alaska, earthquake of February 28, 1979: Tectonic setting and precursory seismic pattern

OMAR J. PEREZ and KLAUS H. JACOB

LAMONT-DOHERTY GEOLOGICAL OBSERVATORY OF COLUMBIA UNIVERSITY, PALISADES, NEW YORK, 10964
FUNVISIS, CARACAS, Venezuela

Abstract

The St. Elias earthquake of February 28, 1979 and two earlier earthquakes in the St. Elias Range, Alaska, are shown to have involved thrust motion on gently NNW-dipping faults associated with subduction of the Pacific beneath the North American Plate. The space-time patterns of the seismicity located within and in the immediate vicinity of the rupture zone of the St. Elias event in the 16-yr period prior to it, indicate approximately 6.3 yr of relative quiescence before the main shock, interrupted by a burst of seismic activity about 3 yr prior to the event. This observed seismic pattern resembles those reported for other large earthquakes, and therefore, we suggest that the preceding burst of activity may have been a precursor.




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