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Published August 2004 | public
Journal Article Open

A Teleseismic Study of the 2002 Denali Fault, Alaska, Earthquake and Implications for Rapid Strong-Motion Estimation


Slip histories for the 2002 M7.9 Denali fault, Alaska, earthquake are derived rapidly from global teleseismic waveform data. In phases, three models improve matching waveform data and recovery of rupture details. In the first model (Phase I), analogous to an automated solution, a simple fault plane is fixed based on the preliminary Harvard Centroid Moment Tensor mechanism and the epicenter provided by the Preliminary Determination of Epicenters. This model is then updated (Phase II) by implementing a more realistic fault geometry inferred from Digital Elevation Model topography and further (Phase III) by using the calibrated P-wave and SH-wave arrival times derived from modeling of the nearby 2002 M6.7 Nenana Mountain earthquake. These models are used to predict the peak ground velocity and the shaking intensity field in the fault vicinity. The procedure to estimate local strong motion could be automated and used for global real-time earthquake shaking and damage assessment.

Additional Information

©2004 Earthquake Engineering Research Institute (Received 18 August 2003; accepted 27 January 2004) We thank Kerry Sieh and Sigun Hreinsdottir for the surface offset data and GPS data. Peter Haeussler and an anonymous reviewer provided constructive suggestions for the manuscript. The digital seismograms used in our inversion were downloaded from the IRIS data center. The figures were prepared by the GMT software (Generic Mapping Tools) written by Paul Wessel and Walter H.F. Smith. The research was supported by U.S. Geological Survey grant No. 03HQAG009. This is Contribution No. 8941, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.


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