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Published February 1986 | Published
Journal Article Open

Scaling differences between large interplate and intraplate earthquakes

Abstract

A study of large intraplate earthquakes with well-determined source parameters shows that these earthquakes obey a scaling law similar to large interplate earthquakes, in which M_0 ∝ L^2 or u = αL, where L is rupture length and u is slip. In contrast to interplate earthquakes, for which α ≈ 1 × 10^(−5), for for the intraplate events α ≈ 6 × 10^(−5), which implies that these earthquakes have stress drops about 6 times higher than interplate events. This result is independent of focal mechanism type. This implies that intraplate faults have a higher frictional strength than do plate boundaries, and hence that faults are velocity or slip weakening in their behavior. This factor may be important in producing the concentrated deformation that creates and maintains plate boundaries.

Additional Information

© 1986, by the Seismological Society of America. Manuscript received 29 July 1985. This work was supported by the National Aeronautics and Space Administration under Grant NAG 5-446. We thank L. R. Sykes and D. W. Simpson for critical reviews.

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August 19, 2023
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