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Bulletin of the Seismological Society of America; June 1994; v. 84; no. 3; p. 660-667
© 1994 Seismological Society of America
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Extremal bounds on earthquake movement from geodetic data: Application to the Landers earthquake

Hadley O. Johnson, Duncan Carr Agnew and Ken Hudnut

Institute of Geophysics and Planetary Physics Scripps Institution of Oceanography University of California San Diego, La Jolla, California 92093-0225
United States Geological Survey, Pasadena, California 91106

Abstract

We present a technique to place quantifiable bounds on the moment of an earthquake from geodetic data, assuming known fault geometry. Application of this technique to the 1992 Landers earthquake shows that the moment must have been between 0.84 and 1.15 x 1020 Nm with 90% confidence (M 7.25 to 7.34). We also find that to satisfy the data to this same level of confidence, the slip on the fault must have exceeded 7 m in at least one location, in good agreement with field mapping of the surface rupture.




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